HKAR-66 Licensing of Maintenance Personnel (Certifying Staff - Maintenance)

applicant is a fit person to hold the licence and furnished such evidence and passed such examinations and test as the Chief Executive may require of him for the purpose of establishing that he has sufficient knowledge, experience, competence and skill in aeronautical engineering. 3. The requirements of this HKAR-66 recognise the Standards prescribed by the Annex 1 to the Convention on International Civil Aviation of the International Civil Aviation Organisation for the grant and extension of licences. 4. Part-66 of the European Aviation Safety Agency (EASA) has been selected to provide where appropriate the content of the HKAR-66. 5. HKAR-66 became effective on 1 April 2002 and was fully implemented by 1April 2004. 6. ‘HKAR-145’ means Hong Kong Aviation Requirements – Approved Maintenance Organisations. 7. ‘HKAR-147’ means Hong Kong Aviation Requirements – Approved Maintenance Training/Examinations. 8. ‘HKAR-AMEL’ means Hong Kong Aviation Requirements – Aircraft Maintenance Engineer Licence. 9. Amendments are incorporated into the text by means of a 'Revision' or a complete 'Re-issue'. INTENTIONALLY LEFT BLANK HKAR-66 1 September 2025 CL-1 ISSUE 3 Revision 6 CHECKLIST OF PAGES ISSUE 1, dated 1 December 2000 ISSUE 1 Revision 1, dated 1 April 2002 ISSUE 1 Revision 2, dated 30 September 2002 ISSUE 1 Revision 3, dated 16 September 2008 ISSUE 2, dated 20 February 2009 ISSUE 2 Revision 1, dated 30 November 2010 ISSUE 2 Revision 2, dated 10 December 2012 ISSUE 2 Revision 3, dated 31 January 2013 ISSUE 2 Revision 4, dated 30 January 2014 ISSUE 2 Revision 5, dated 30 October 2015 ISSUE 2 Revision 6, dated 31 August 2016 ISSUE 3, dated 8 November 2018 ISSUE 3 Revision 1, dated 15 April 2019 ISSUE 3 Revision 2, dated 14 March 2022 ISSUE 3 Revision 3, dated 31 August 2023 ISSUE 3 Revision 4, dated 5 July 2024 ISSUE 3 Revision 5, dated 1 March 2025 ISSUE 3 Revision 6, dated 1 September 2025 The following pages of HKAR-66 are now current: Page No Page Title Page 1 September 2025 ii 1 September 2025 C-1 to C-5 1 September 2025 F-1 5 July 2024 CL-1 to CL-2 1 September 2025 P-1 to P-13 1 September 2025 1-0-1 8 November 2018 1-1 to 1-14 5 July 2024 2-0-1 8 November 2018 2-1 to 2-10 5 July 2024 3-0-1 8 November 2018 3-1 to 3-10 5 July 2024 4-APP I-1 to 4-APP I-117 1 March 2025 4-APP II-1 to 4-APP II-6 1 March 2025 4-APP III-1 to 4-APP III-33 1 March 2025 4-APP IV-1 8 November 2018 4-APP V-1 5 July 2024 4-APP VI-1 to 4-APP VI-6 5 July 2024 4-APP VII-1 to 4-APP VII-4 1 March 2025 HKAR-66 1 September 2025 CL-2 ISSUE 3 Revision 6 4-APP VIII-1 to 4-APP VIII-2 8 November 2018 4-APP IX-1 to 4-APP IX-5 14 March 2022 4-APP X-1 to 4-APP X-2 8 November 2018 4-APP XI-1 to 4-APP XI-7 1 March 2025 4-APP XII-1 to 4-APP XII-9 1 September 2025 4-APP XIII-1 14 March 2022 4-APP XIV-1 to 4-APP XIV-3 31 August 2023 4-APP XV-1 to 4-APP XV-2 5 July 2024 4-APP XVI-1 31 August 2023 4-APP XVII-1 to 4-APP XVII-5 1 March 2025 4-APP XVIII-1 to 4-APP XVIII-4 1 September 2025 4-APP XIX-1 to 4-APP XIX-5 1 March 2025 4-APP XX-1 to 4-APP XX-5 1 March 2025 5-APP I-1 to 5-APP I-20 1 March 2025 5-APP II-1 to 5-APP II-22 8 November 2018 5-APP III-1 to 5-APP III-4 8 November 2018 HKAR-66 1 September 2025 P-1 ISSUE 3 Revision 6 PREAMBLES The preambles are intended to be a summarised record of the main changes introduced by each amendment of HKAR-66. ISSUE 1 1 December 2000 New requirement for the maintenance certifying staff to qualify for the issuing of certificates of release to service. It should be noted that HKAR-66 is applicable to the release to service of aeroplanes and helicopters. ISSUE 1 Revision 1 1 April 2002 Amend the effective and compliance dates stated in HKAR 66.3 from 1 January 2002 and 1 January 2004 to 1 April 2002 and 1 April 2004 respectively. ISSUE 1 Revision 2 30 September 2002 Added a new Appendix 4 to Section 2 to provide guidance to complete the Record of Experience. ISSUE 1 Revision 3 16 September 2008 Revised the suggested study material in Appendix 3 to Section 2. ISSUE 2 20 February 2009 − Changed the structure of the HKAR-66 publication. There are four sections where Section 1 contains the requirements and Sections 2, 3 and 4 contain the Acceptable Means of Compliance (AMC), the Guidance Material (GM) and the Appendices respectively. − Aligned, as applicable, the paragraph contents and numbering of the HKAR-66 to those of EASA Part 66. − Transferred applicable paragraphs from HKAR 66.1 General to HKAR 66.70 Conversion provisions. − Amended definitions of CAD and Director-General in HKAR 66.5 − Amended HKAR 66.15 Eligibility to state that applicant shall be at least 18 years of age. − Amended HKAR 66.30 Experience requirements to align with EASA Part 66. HKAR-66 1 September 2025 P-2 ISSUE 3 Revision 6 − Amended HKAR 66.40 Continuity of the aircraft maintenance licence to reflect a maximum 5 years renewal period. − Added HKAR 66.70 Conversion provisions to align with EASA Part 66. − Removed INTERPRETATIVE / EXPLANATORY MATERIAL (IEM) from Section 2. Some of the IEM became Guidance Material (GM) at Section 3. − Added definition of line and base maintenance at AMC 66.20(a) Privileges. − Added knowledge and practical training requirements at AMC 66.45(d) Type/task training and ratings to align with EASA Part 66. − Added AMC 66.70 Conversion provisions to provide information on HKAR-66 licence conversion. − Added new Section 3 Guidance Material (GM) to provide relevant information. − Added GM 66.20(b)(3) Privileges to specify the need of a general knowledge of the language used within the maintenance environment of certifying staff. − Moved Section 2 Appendices 1 to 4 to the new Section 4 Appendices 1 to 4. − Amended Section 4 Appendix 1 to align with Appendix 1 to EASA Part 66 applicable modules/subject and added Hong Kong Aviation Regulations at Module 10 to include the requirements of Safety Management System and Influence of psychoactive substances. − Added Section 4 new Appendices 5 to 7. ISSUE 2 Revision 1 30 November 2010 − Amended HKAR 66.30(b)(2) and AMC 66.30(b) to include a provision to accept three years of practical maintenance experience on operating aircraft for a graduated candidate holding an appropriate engineering degree for Category B applicant. − Corrected minor typographical error at Section 4 Appendix 1 page 4-APP 1-3 the qualification matrix on basic subjects. ISSUE 2 Revision 2 10 December 2012 − Amended address and telephone number of CAD in page ii and Appendix 3 of Section 4. HKAR-66 1 September 2025 P-3 ISSUE 3 Revision 6 ISSUE 2 Revision 3 31 January 2013 − Amended HKAR 66.20(a)(3) Privileges to change the term “electrical power systems” to electrical systems. − Amended Section 4 Appendix 1 - Basic Knowledge Requirements on Module 13 and 14 to align with EASA Part 66. − Amended Section 4 Appendix 4 Table 1 and Table 2. − Amended Section 4 Appendix 5 paragraph 2 - Type Training Standard for Category B2 certifying staff. − Amended Section 4 Appendix 7 - Aircraft Type Practical Experience List of Tasks to add tasks on Integrated Modular Avionics (ATA 42), Cabin Systems (ATA 44) and Information Systems (ATA 46). ISSUE 2 Revision 4 30 January 2014 − Amended HKAR 66.1 - General to include Category B2*. Note was changed to Note 1 and added Note 2. − Amended HKAR 66.5 - Added definitions of “Electrical system”, “Avionics system” and “Simple test”. − Amended HKAR 66.10 - to reflect application form required to be submitted to the Director- General. − Amended HKAR 66.20 - Privileges to define the certification privileges of Category B2*. Note was changed to Note 1 and added Note 2. − Amended Section 4 Appendix 1 - Basic Knowledge Requirements in Module 13 and 14 to reflect the requirements for Category B2 and B2*. − Amended Section 4 Appendix 3 – Suggested Study Material to add reference materials for Module 13. − Amended Section 4 Appendix 4 – Record of Experience Table 1 to reflect the requirements for Category B2 and B2*. − Amended Section 4 Appendix 5 – Type Training and Examination Standard paragraph 2 to reflect the requirements of type training standards for Category B2 and B2*. HKAR-66 1 September 2025 P-4 ISSUE 3 Revision 6 ISSUE 2 Revision 5 30 October 2015 − Changed the aircraft ratings endorsement of aircraft maintenance licences to include group and subgroup ratings to align with the EASA Part 66. − Aligned, as applicable, the paragraph contents of the HKAR-66 to those of the EASA Part 66. − Amended Section 4 Appendix 1 – To align with the EASA Part 66 applicable modules/subject, basic knowledge requirements in various modules to reflect the requirements for Category B3. − Amended Section 4 Appendix 4 – Record of Experience Table 1 to include additional experience requirements on ATA 42, 44, 45 and 46 for various Licence Categories. − Amended Section 4 Appendix 5 – In particular added the nominal time spending to answer a type examination question and the number of questions in a type examination in paragraph 4. − Amended Section 4 Appendix 7 – Aircraft Type Practical Experience List of Tasks to add tasks on various ATA chapters. ISSUE 2 Revision 6 31 August 2016 − Amended HKAR 66.25 – To include the requirement of accrediting HKAR-147 Certificate of Recognition (CoR) as an acceptable basic knowledge qualification for the HKAR-66 AML application. ISSUE 2 Revision 7 31 March 2017 − Amended Section 4 Appendix 3 – To update the publication website. Amended Section 4 Appendix 5 – Added the maximum number of training hours per day and minimum participation time for the theoretical element of the aircraft type training course to align with the EASA Part 66 AMC to Appendices. ISSUE 3 8 November 2018 − Added full names and abbreviations of HKAR-2, HKAR-145, HKAR-147 and HKAR-AMEL and editorial changes in Foreword. − Retitled HKAR 66.1 to “Scope”, moved the contents of 66.1(b) and Note 2 to 66.3, and deleted the remaining information. − Renumbered and relocated the contents of HKAR 66.2 as HKAR 66.5 “Aircraft groups”. HKAR-66 1 September 2025 P-5 ISSUE 3 Revision 6 − Deleted the original HKAR 66.3 “Effectively” and added a new HKAR 66.3 “Licence categories”. − Renumbered HKAR 66.5 as HKAR 66.2 “Definitions”, added definitions of “Complex maintenance tasks”, “Complex motor-powered aircraft” and “Minor scheduled line maintenance”, and relocated definitions of “Electrical system”, “Avionics system”, and “Simple test” to GM 66.20(a). − Customised HKAR 66.10 to reflect CAD processes. − Amended HKAR 66.20 to add privileges to category B2 licence holder for issuing certificates of release to service following minor scheduled line maintenance and simple defect rectification, and added situation for holder of type-rated licence for simple light aeroplanes and some helicopters as determined by the Director-General in HKAR 66.20 (b)(1). − Added new HKAR 66.25(c). − Retitled HKAR 66.30 to “Basic experience requirements”, editorially changed and renumbered the sub-paragraphs, and added new HKAR 66.30(f). − Retitled HKAR 66.40 to “Continued validity of the aircraft maintenance licence”, editorially changed and renumbered the sub-paragraphs, and added new HKAR 66.40(b). − Amended HKAR 66.45 and renumbered the sub-paragraphs. − Renumbered HKAR 66.47 “Limitations “to HKAR 66.50. − Renumbered HKAR 66.50 “Medical fitness” to HKAR 66.47. − Editorially changed HKAR 66.55, and changed the reasonable time of showing the licence from 5 working days to 24 hours to align with HKAR-145. − Editorially changed HKAR 66.70 and added a new sub-paragraph (e). − Moved contents of AMC 66.20(a) to GM 66.20(a). − Editorially changed AMC 66.20(b)3 to reflect HKAR-AMEL. − Added a new paragraph 4 to AMC 66.25 to reflect CAD policy and renumbered other paragraphs of AMC 66.25. − Retitled AMC 66.30 to “Basic experience requirements”, and amended the paragraph as 66.30(b). − Retitled “AMC 66.45(b)(3), (c)(1)iii and (c)(2)i” to “AMC 66.45(d), (e) 3, (f) 1 and (g)1”. − Renumbered AMC 66.47 (b) “Limitations” as AMC 66.50(b). HKAR-66 1 September 2025 P-6 ISSUE 3 Revision 6 − Added a new paragraph “Medical fitness” and assigned as GM 66.47. − Amended the module numbers in AMC 66.70 paragraph 5 to align with Section 4 Appendix I. − Added a new paragraph GM 66.3, of which the contents were from the old GM 66.20(a)2. − Editorially changed GM 66.20 and renumbered the sub-paragraphs. − Removed category B2 from GM 66.25(a). − Deleted GM 66.30(b) and the contents were amended and moved to AMC 66.30(b)4. − Added a new paragraph 1 to GM 66.40. and renumbered the remaining sub-paragraphs. − Renumbered GM 66.50 to GM 66.47 “Medical Fitness”. − Editorially changed GM 66.65. − Editorially changed Section 4 Appendix I, including renumbered the modules. − Renumbered Section 4 Appendix 2 “Specimen examination questions” to Section 4 Appendix X. − Renumbered Section 4 Appendix 3 “Suggested study material” to Section 4 Appendix XI. − Added new Section 4 Appendix II “Basic examination standard”. − Added new Section 4 Appendix III “Aircraft type training and examination standard — On the job training” which incorporated the applicable contents of the old Appendix 5 and adopted the applicable requirements of the EASA Regulation (EU) No. 1321/2014. The requirement of ‘On the Job Training shall comprise a period of 4 months’ was removed. − Moved Section 4 Appendix 4 “Record of Experience” to a new Appendix IX. The original Appendix 6 “Experience requirements for extending a HKAR-66 Aircraft Maintenance Licence” was relocated to Appendix IV. − Moved the contents of Section 4 Appendix 5 to Appendix III and replaced with a new Appendix V “Application forms”. − Added Appendix VI “Aircraft maintenance licence referred to in HKAR-66”. − Moved the contents of Section 4 Appendix 7 “Aircraft type practical experience list of tasks” to the new Section 5 Appendix II “Aircraft type practical experience and on-the-job training - list of tasks”. − Added new Section 4 Appendix VII “Differences between B2 and B2* in basic knowledge requirements”. HKAR-66 1 September 2025 P-7 ISSUE 3 Revision 6 − Added new Section 4 Appendix VIII “Complex maintenance tasks”. − Added new Section 4 Appendix X “Specimen examination questions” to incorporate the contents of the old Appendix 2. − Added new Section 4 Appendix XI “Suggested Study Material” to incorporate the contents of the old Appendix 3, and changed reference book “Electrical Technology” to “Electrical and Electronic Technology”. − Added new Section 5 “Appendices to AMCs to HKAR-66”. − Added new Section 5 Appendix I “Aircraft type ratings for HKAR-66 aircraft maintenance licences”. − Added new Section 5 Appendix III “Evaluation of the competence: assessment and assessors”. ISSUE 3 Revision 1 15 April 2019 − Amended Section 2 – To amend typo, changing AMC 66.30(b) to AMC 66.30(a). − Amended Section 4 Appendix I – To update wording from “Duplicate inspections” to “Duplicate / independent inspection” − Amended Section 4 Appendix III – To add EDTO wording to ETOPS ISSUE 3 Revision 2 14 March 2022 − Amended HKAR 66.2 – To editorially change the reference of ‘Complex maintenance tasks’. − Amended HKAR 66.10(a) – To update the reference of DCA 35. − Amended HKAR 66.10(b) – To update the reference of DCA 35A. − Amended HKAR 66.10(c) – To update the reference of DCA 35C. − Amended HKAR 66.20(a)(3)(ii) – To editorially change references of new syllabi in Modules 7A, 13 and 14, and differences between B2 and B2* in basic knowledge requirements in Note 2. − Amended HKAR 66.25(a) – To editorially change the reference of Section 4 Appendix I in Note − Amended HKAR 66.30(b) – To update references of minimum civil aircraft maintenance experience requirements and examination for extension of aircraft maintenance licence. HKAR-66 1 September 2025 P-8 ISSUE 3 Revision 6 − Amended HKAR 66.40(a) – To update the reference of application for the renewal of aircraft maintenance licence. − Amended HKAR 66.45(c) – To editorially change the reference of Section 4 Appendix III. − Amended HKAR 66.45(d) – To editorially change the reference of Section 4 Appendix III. − Amended HKAR 66.50(c) – To update the reference of removal of limitation. − Amended HKAR 66.70(b) – To update the reference of qualification conversion. − Amended HKAR 66.70(d) – To update the reference of conversion from AMEL to HKAR-66 licence. − Amended HKAR 66.70(e) – To update the reference for conversion of HKAR-66 licence from non HKAR-66 licence. − Amended AMC 66.20(b)3 – To editorially change references of Section 5 Appendix I and Section 4 Appendix I. − Amended AMC 66.25(1) & (2) – To editorially change references of Section 4 Appendix I. − Amended AMC 66.45(d), (e)3, (f)1 and (g) – To editorially change references of Section 5 Appendix II in subparagraph 1 and 2. − Amended AMC 66.45(e)3 – To editorially change references of Section 5 Appendix I. − Amended GM 66.45 – To editorially change references of Section 4 Appendix III in paragraph 1 and Note. − Amended GM 66.45(b) – To editorially change the reference of Section 5 Appendix I. − Deleted GM 66.65. − Amended Section 4 Appendix II – To editorially change the reference of essay questions in paragraph 1.4. − Amended Section 4 Appendix III – To editorially change the ‘Appendix III’ to ‘this Appendix’ in paragraph 1(c)(ii). − Amended Section 4 Appendix III – To editorially change the Category ‘B2’ to ‘B2*’ in paragraph 4.1(e). − Amended Section 4 Appendix III, AMC to Paragraphs 1(b), 3.2 and 4.2 of Appendix III to HKAR-66 ‘Aircraft Type Training and Examination Standard - On-the-Job Training’ – To editorially change the reference of ‘HKAR-66 Appendix III’ in paragraph 2, 3 and 5. HKAR-66 1 September 2025 P-9 ISSUE 3 Revision 6 − Amended Section 4 Appendix III, AMC to Paragraphs 1(c) of Appendix III to HKAR-66 ‘Aircraft Type Training and Examination Standard - On-the-Job Training’ – To editorially change the reference of differences training. − Amended Section 4 Appendix III, AMC to Paragraphs 3.1 (d) of Appendix III to HKAR-66 ‘Aircraft Type Training and Examination Standard - On-the-Job Training’ – To editorially change the reference of ‘HKAR-66 Appendix III’ in paragraph 1, 2 and 5(b), (c), (d), and (g). − Amended Section 4 Appendix III, AMC to Paragraphs 6 of Appendix III to HKAR-66 ‘Aircraft Type Training and Examination Standard - On-the-Job Training’ – To editorially change the reference of ‘Section 5 Appendix II’ in paragraph 4 and reference for guidance of assessors in paragraph 8. − Amended Section 4 Appendix V –To update the CAD website for application forms. − Amended Section 4 Appendix VI – To update the reference for Aircraft Type Ratings for HKAR-66 Aircraft Maintenance Licence in paragraph 6. − Amended Section 4 Appendix IX – To update the CAD website for DCA 35B in paragraph 2.4 and attached updated sample of DCA 35B. − Added Section 4 Appendix XII, procedures for initial issue, variation or renewal of HKAR- 66 Aircraft Maintenance Licence. − Added Section 4 Appendix XIII, HKAR-66 Aircraft Maintenance Licence. − Added Section 4 Appendix XIV, HKAR-66 Aircraft Maintenance Licence type endorsement - Acceptance of aircraft maintenance qualification – type training not issued / approved by the Director-General. − Added Section 4 Appendix XV, Limitations on HKAR-66 Aircraft Maintenance Licence. − Added Section 4 Appendix XVI, Procedures and basis for HKAR-66 Aircraft Maintenance Licence examinations. − Added Section 4 Appendix XVII, HKAR-AMEL to HKAR-66 conversion examinations requirements. − Added Section 4 Appendix XVIII, exemptions from HKAR-66 examinations. − Added Section 4 Appendix XIX, HKAR-66 examinations for extensions to basic licence categories. − Amended Section 5 Appendix I- To update aircraft type rating and codes. HKAR-66 1 September 2025 P-10 ISSUE 3 Revision 6 ISSUE 3 Revision 3 31 August 2023 − Amended Section 4 Appendix II – To add the new requirement of split essay examination into separate papers by module and marking standard. − Amended Section 4 Appendix II – To renumber paragraphs and elaborate the definition of waiting period after a maximum of three attempts. − Amended Section 4 Appendix II – To add the penalty for candidates who is proven to be cheating or breaching the examination rules. − Amended Section 4 Appendix VI – To elaborate the requirement for aircraft type endorsement and update the reference in the limitation code table. − Amended Section 4 Appendix XI – To update the suggested study material list. − Amended Section 4 Appendix XII – To update the procedures for the initial issue / variation / renewal of the HKAR-66 Aircraft Maintenance Licence. − Amended Section 4 Appendix XIV – To update the reference of the list of aircraft types. − Deleted Section 4 Appendix XVI, Procedures and basis for HKAR-66 Aircraft Maintenance Licence examinations. − Amended Section 4 Appendix XVIII - To update the list of non HKAR-66 licences and the required module examinations. − Added Section 4 Appendix XX, Certification Privileges for HKAR-AMEL group type ratings transferred onto HKAR-66 AML. − Amended Section 5 Appendix I- To update aircraft type rating and codes. ISSUE 3 Revision 4 5 July 2024 − Amended Foreword - To delete HKAR-2 from paragraph 6 and renumber subsequent paragraphs. − Amended HKAR 66.10(a) - To refer the application of aircraft maintenance licence to PLIS. − Deleted HKAR 66.10(b). − Amended HKAR 66.10(d) - To refer the application of aircraft maintenance licence written examination to PLIS. − Amended HKAR 66.40(b) - To editorially change the reference of the renewal of aircraft maintenance licence to HKAR 66.10(a). HKAR-66 1 September 2025 P-11 ISSUE 3 Revision 6 − Amended AMC 66.10 -To add paragraph (1) to refer applications of AML to PLIS, re-number subsequent paragraphs and delete ‘form’ from the last sentence of the renumbered paragraph (2). − Amended AMC 66.10(2) - To editorially change the last sentence by deleting the word ‘form’. − Amended GM 66.40(2) - To revise the reference of the renewal of AML to HKAR 66.10(a). − Amended note to GM 66.40(3) - To further elaborate the relevant aircraft maintenance activities. − Amended GM 66.40(6) - To change the word ‘his’ by ‘the’ in the first sentence. − Amended GM 66.45, aircraft rating requirement table for aircraft groups - To editorially change the term ‘Group 1’ and replace ‘agency’ by’ Director-General’ for the Aircraft equipped with fly-by-wire. − Amended GM 66.45, aircraft rating requirement table for aircraft groups – To editorially change the term ‘Group 3’ for piston engine aeroplanes. − Amended Section 4 Appendix I, syllabus of Module 10.5 - To delete ‘approval’ from Radio station licence and replace ‘all weather operations’ by ‘CAD 359 LOW VISIBILITY OPERATIONS (LVO)’ . − Amended Section 4 Appendix I. syllabus of Module 10.8 - To delete ‘HKAR-2’ and replace ‘HKAR-MMEL/MEL’ by ‘CAD 549’. − Amended Section 4 Appendix II - To delete paragraph 1.9 and renumber subsequent paragraphs. − Amended Section 4 Appendix VI - To replace ‘Airworthiness Notice No.10’ by ‘ Section 4 Appendix XX’ for limitation code 44, 45, 46 and 999. − Amended Section 4 Appendix V - To revise paragraph 1 related to types of applications aligned with PLIS, add paragraph 2 to state the form available for download from CAD website and add paragraph 3 about the arrangement of the application for transfer of HKAR- AMEL licence to HKAR-66 AML. − Amended Section 4 Appendix XII - To revise the heading of Appendix XII, contents of paragraph 1.1, paragraph 1.3, heading of paragraph 3, heading of paragraph 4, paragraph 4.2, paragraph 4.4 and paragraph 5.3 related to types of applications associated with PLIS. − Amended Section 4 Appendix XII - To amend paragraph 2.1 by referring the application for issue of a AML to HKAR 66.10 and, paragraph 5.2 by referring the application for renewal of a AML to HKAR 66.10 (c) and HKAR-AMEL to AML to HKAR 66.10(c) respectively. HKAR-66 1 September 2025 P-12 ISSUE 3 Revision 6 − Amended Section 4 Appendix XII – To replace ‘DCA 35’ by ‘application’ in paragraph 2.2, paragraph 2.7 and paragraph 4.5. − Amended Section 4 Appendix XII – To delete ‘and application form” from paragraph 1.2. − Amended Section 4 Appendix XII – To delete the phrase ‘ in terms …signature’ from the last sentence of paragraph 2.7 and ‘ except that… in the application’ from the last sentence of paragraph 3.1. − Amended Section 4 Appendix XII – To rephrase paragraph 2.9.2, second sentence of paragraph 2.9.3, paragraph 3.1, paragraph 5.5(a) and paragraph 5.5(b). − Amended Section 4 Appendix XII – To delete the last sentence related to the renewal and transfer of HKAR-AMEL to HKAR-66 in paragraph 5.4. − Amended Section 4 Appendix XV - To replace ‘Airworthiness Notice No. 10’ by ‘Section 4 Appendix XX’ for limitation code 44, 45, 46 and 999, and delete ‘Airworthiness Notice No. 10’ from the last sentence of limitation code 999. − Amended Section 4 Appendix XVIII – To rephrase ‘non HKAR-66’ as ‘non-HKAR-66’, standardise the names of licensing standards of non-HKAR-66 AML. − Amended Section 4 Appendix XVIII – To amend paragraph 1.2 by clarifying that the same non-HKAR-66 licence is considered in the application for the conversion examination and the initial grant of HKAR-66 AML. − Amended Section 4 Appendix XVIII - To amend paragraph 1.5 by standardising the names of licensing standards, sub-categories and associated conversion requirements non-HKAR-66 AML. − Amended Section 4 Appendix XVIII – To add the conversion examinations for New Zealand AMEL holders with ‘A & C’ and ‘E+I+R’ and remove the English requirements for CCAR-66 holder. − Amended Section 4 Appendix XVIII – To add note to specify that the non-HKAR-66 licences and associated sub-categories not listed were not assessed to determine required conversion examinations to HKAR-66. − Amended Section 4 Appendix XIX - To correct typo, changing 13.1.3 to 13.1.c) of tables in paragraph 2 and 6.3 to 6.3.1 of tables in paragraph 3 and replacing ‘HKAR-2 Chapter 23’ by ‘HKAR-66 Appendix XVII’ quoted in the table in paragraph 6, and further elaborate the conversion examination requirements for extensions to Basic Licence Categories other than listed in paragraph 6. HKAR-66 1 September 2025 P-13 ISSUE 3 Revision 6 − Amended Section 4 Appendix XX – to add ‘paragraph 7’ and paragraph 7 for Certification Privileges for Rotorcraft’, and replace ‘company’ by ‘HKAR-145 organisation’ from the heading of paragraph 14 . ISSUE 3 Revision 5 1 March 2025 − Amended Section 4 Appendix I to include the changes in M7, M9 and M10 with reference to the EASA Part-66 of Regulation (EU) 2023/989. − Amended Section 4 Appendix II to include the changes in M7, M9 and M10 with reference to the EASA Part-66 of Regulation (EU) 2023/989, and with other editorial changes. − Amended Section 4 Appendix III with editorial changes. − Amended Section 4 Appendix VII to simplify the table shown. − Amended Section 4 Appendix XI to update the suggested study material. − Amended Section 4 Appendix XII with editorial changes. − Amended Section 4 Appendix XVII to simplify the table shown. − Amended Section 4 Appendix XVIII to simplify the table shown. − Amended Section 4 Appendix XIX to simplify the table shown. − Amended Section 4 Appendix XX with editorial changes. − Amended Section 5 Appendix I on aircraft type rating, and with other editorial changes. ISSUE 3 Revision 6 1 September 2025 − Amended Section 4 Appendix XII to clarify permanent resident. − Amended Section 4 Appendix XVIII with editorial changes. − Amended Section 4 Appendix XVIII to clarify non-HKAR-66 licence with limitation indicated in the licence is not eligible for exemption from HKAR-66 examinations. − Amended Section 4 Appendix XVIII to clarify Hong Kong aviation organisation is an entity engaged in issuing certification of maintenance in accordance with Hong Kong Aviation Requirements. − Amended Section 4 Appendix XVIII in relation to CCAR-66 Licence. SECTION 1 HKAR-66 8 November 2018 1-0-1 ISSUE 3 SECTION 1 - REQUIREMENTS 1 GENERAL This Section 1 contains the Requirements for Licensing of Maintenance Personnel (Certifying Staff - Maintenance). 2 PRESENTATION 2.1 The requirements of HKAR-66 are presented in full page width on loose pages, each page being identified by the date of issue or issue/revision number under which it is reissued or amended. 2.2 Sub-headings are in bold typeface. 2.3 Explanatory Notes not forming part of the requirements appear in smaller typeface. 2.4 New, amended and corrected text is indicated by a marginal line. SECTION 1 HKAR-66 5 July 2024 1-1 ISSUE 3 Revision 4 HKAR 66.1 Scope This section defines the aircraft maintenance licence and establishes the requirements for application, issue and continuation of its validity. HKAR 66.2 Definitions For the purpose of this HKAR-66, the following definitions shall apply: ‘Aircraft maintenance licence’ means a document issued as evidence of qualification confirming that the person to whom it refers has met the HKAR-66 knowledge and experience requirements for any aircraft basic category and aircraft type rating specified in the document. ‘CAD’ means Civil Aviation Department of the Hong Kong Special Administrative Region of the People’s Republic of China. ‘Certification’ means the issuance of a certificate of release to service. ‘Complex maintenance tasks’ means the tasks listed in Section 4 Appendix VIII. ‘Complex motor-powered aircraft’ means: (i) an aeroplane: − with a maximum certificated take-off mass exceeding 5700 kg, or − certificated for a maximum passenger seating configuration of more than nineteen, or − certificated for operation with a minimum crew of at least two pilots, or − equipped with (a) turbojet engine(s) or more than one turboprop engine, OR (ii) a helicopter: − for a maximum certificated take-off mass exceeding 3175 kg, or − certificated for a maximum passenger seating configuration of more than nine, or − certificated for operation with a minimum crew of at least two pilots, OR (iii) a tilt rotor aircraft. ‘Director-General’ means the Director-General of Civil Aviation who is authorised for the purpose under the Air Navigation (Hong Kong) Order 1995 by the Chief Executive of the SECTION 1 HKAR-66 5 July 2024 1-2 ISSUE 3 Revision 4 Hong Kong Special Administrative Region of the People’s Republic of China and includes any person who is delegated for that purpose. ‘Full GROUP 3 RATING’ means a group rating classified for group 3 aircraft. An example of this kind of group rating to be printed on the licence is shown below: “Full group 3” ‘Full SUBGROUP RATING’ means a group rating classified for group 2 aircraft under a single subgroup. An example of this kind of group rating to be printed on the licence is shown below: “Full subgroup 2b” ‘Large aircraft’ means an aircraft, classified as an aeroplane with a maximum take-off mass (MTOM) of more than 5700 kg, or multi-engined helicopter. ‘Manufacturer SUBGROUP RATING’ means a group rating classified for either a subgroup 2a, subgroup 2b, or subgroup 2c aircraft under the same manufacturer. An example of this kind of group rating to be printed on the licence is shown below: “Subgroup 2c (Robinson)” ‘Minor scheduled line maintenance’ means any minor scheduled inspection / check up to and including a weekly check specified in the aircraft maintenance programme. For aircraft maintenance programmes that do not specify a weekly check, the Director-General will determine the most significant check that is considered equivalent to a weekly check. This definition is for the purposes of HKAR 66.20(a)(1) and HKAR 66.20(a)(3)(ii) personnel. ‘Organisation procedures’ means the procedures applied by the HKAR-145 Approved Maintenance Organisations in accordance with the maintenance organisation exposition within the scope of the approval. ‘Simple light aeroplane’ means a piston-engine non-pressurised aeroplane with MTOM of 2000 kg and below, and not fitted with a full authority coupled autopilot/flight director. ‘Wooden aeroplane’ means an aeroplane fitted with wooden wing spars. SECTION 1 HKAR-66 5 July 2024 1-3 ISSUE 3 Revision 4 HKAR 66.3 Licence categories (See GM 66.3) (a) Aircraft maintenance licences include the following categories: Category A Category B1 Category B2/B2* Category B3 Category C (b) Categories A and B1 are subdivided into subcategories relative to combinations of aeroplanes, helicopters, turbine and piston engines. These subcategories are: A1 and B1.1 Aeroplanes Turbine A2 and B1.2 Aeroplanes Piston A3 and B1.3 Helicopters Turbine A4 and B1.4 Helicopters Piston Note: All descriptions and requirements applicable to category B2 are also applicable to category B2*. Also, additional descriptions and requirements are included for category B2*. (c) Category B3 is applicable to piston-engine non-pressurised aeroplanes with MTOM of 2000 kg and below. HKAR 66.5 Aircraft groups For the purpose of ratings on aircraft maintenance licences, aircraft shall be classified in the following groups: 1. Group 1: complex motor-powered aircraft as well as multiple engine helicopters, aeroplanes with maximum certified operating altitude exceeding FL290, aircraft equipped with fly-by-wire systems and other aircraft requiring an aircraft type rating when defined so by the Director-General. 2. Group 2: aircraft other than those in group 1 belonging to the following subgroups: Subgroup 2a: single turbo-propeller engine aeroplanes Subgroup 2b: single turbine engine helicopters Subgroup 2c: single piston engine helicopters 3. Group 3: piston engine aeroplanes other than those in group 1. SECTION 1 HKAR-66 5 July 2024 1-4 ISSUE 3 Revision 4 HKAR 66.7 Applicability (a) This HKAR-66 prescribes the requirements for the qualification of those personnel authorised by a HKAR-145 approved maintenance organisation to issue certificates of release to service. Such personnel are required to hold a valid type rated, subgroup rated or group rated HKAR-66 aircraft maintenance licence, which attests to their knowledge and experience and in the case of HKAR-145 a valid HKAR-145 certification authorisation which grants certification privileges to the individual. Note: A type rated, subgroup rated or group rated HKAR-66 aircraft maintenance licence normally does not confer any certification privileges on the holder in their own right. Such licence must be used in conjunction with a certification authorisation unless otherwise accepted by the Director-General. (b) For the issue of HKAR-66 aircraft maintenance licence compliance is required with HKAR 66.15, HKAR 66.25 and HKAR 66.30 for the appropriate HKAR 66.20 basic category/categories. The HKAR-66 aircraft maintenance licence will be endorsed with the relevant HKAR 66.20 basic category/categories and where appropriate any aircraft type ratings granted under HKAR 66.45. Note: The HKAR-66 aircraft maintenance licence can be issued without any aircraft type ratings. (c) For the issue of HKAR-145 certification authorisation compliance is required with paragraph (b), HKAR 66.40, HKAR 66.45, HKAR 66.50 and HKAR 66.55. Note: HKAR-145 contains additional requirements to qualify to make certification(s). (d) This HKAR-66 also prescribes the requirements for the qualification of those personnel who are permitted to issue certificate of release to service under the certification privileges specifically endorsed on the type rated HKAR-66 aircraft maintenance licence. Note: A type rated HKAR-66 aircraft maintenance licence with certification privileges to make certification(s) is normally limited to simple light aeroplanes and some helicopters, as determined necessary by the Director-General. HKAR 66.10 Application (See AMC 66.10) (a) An application for issue, extension or renewal of an aircraft maintenance licence shall be made to the Director-General via Personnel Licensing Information System (PLIS) in accordance with Section 4 Appendix XII unless otherwise directed by the Director- General. SECTION 1 HKAR-66 5 July 2024 1-5 ISSUE 3 Revision 4 (b) Reserved. (c) An application for transfer of HKAR-AMEL licence to HKAR-66 aircraft maintenance licence shall be made to the Director-General in accordance with Section 4 Appendix V and Appendix XVII. (d) An application for HKAR-66 aircraft maintenance licence written examination shall be made to the Director-General via PLIS unless otherwise directed by the Director- General. (e) Each application shall be supported by documentation to demonstrate compliance with the applicable theoretical knowledge, practical training and experience requirements at the time of application. (f) Application for category B2 basic licence, category B2 type rating and category B2 group rating is no longer accepted. HKAR 66.15 Eligibility An applicant for an aircraft maintenance licence shall be at least 18 years of age. HKAR 66.20 Privileges (See AMC 66.20 and GM 66.20) (a) The following privileges shall apply: 1. A category A aircraft maintenance licence permits the holder to issue certificates of release to service following minor scheduled line maintenance and simple defect rectification within the limits of tasks specifically endorsed on the certification authorisation referred to in HKAR 145.35. The certification privileges shall be restricted to work that the licence holder has personally performed in the maintenance organisation that issued the certification authorisation. 2. A category B1 aircraft maintenance licence shall permit the holder to issue certificates of release to service and to act as B1 support staff following: − maintenance performed on aircraft structure, powerplant and mechanical and electrical systems, − work on avionic systems requiring only simple tests to prove their serviceability and not requiring troubleshooting. Category B1 includes the corresponding A subcategory. SECTION 1 HKAR-66 5 July 2024 1-6 ISSUE 3 Revision 4 3. A category B2 aircraft maintenance licence shall permit the holder to issue certificates of release to service following maintenance on avionic and electrical system. A category B2* aircraft maintenance licence shall permit the holder: (i) to issue certificates of release to service and to act as B2* support staff for following: − maintenance performed on avionic and electrical systems, and − electrical and avionics tasks within powerplant and mechanical systems, requiring only simple tests to prove their serviceability. (ii) to issue certificates of release to service following minor scheduled line maintenance and simple defect rectification within the limits of tasks specifically endorsed on the certification authorisation referred to in HKAR 145.35. This certification privilege shall be restricted to work that the licence holder has personally performed in the maintenance organisation which issued the certification authorisation and limited to the ratings already endorsed in the B2* licence. Note 1: Category B2 aircraft maintenance licence holder can qualify for any A subcategory subject to compliance with the appropriate A subcategory requirements. Note 2: The new syllabi in Modules 7A, 13 and 14 came into effect on 1 August 2013 for B2*. Refer to Section 4 Appendix I for details. The differences between B2 and B2* in basic knowledge requirements are tabulated in Section 4 Appendix VII. 4. A category B3 aircraft maintenance licence shall permit the holder to issue certificates of release to service and to act as B3 support staff for: − maintenance performed on aeroplane structure, powerplant and mechanical and electrical systems, − work on avionic systems requiring only simple tests to prove their serviceability and not requiring troubleshooting. 5. A category C aircraft maintenance licence shall permit the holder to issue certificates of release to service following base maintenance on aircraft. The privileges apply to the aircraft in its entirety. Note 1: HKAR-145 specifies the personnel required to support category C certifying staff in base maintenance, including in particular the requirement for qualified category B1 and B2/B2* staff. Note 2: HKAR-145 does not require a category C certifying staff for the certification of simple light aeroplanes as category B3 or B1.2 or B1.4 covers all maintenance. SECTION 1 HKAR-66 5 July 2024 1-7 ISSUE 3 Revision 4 (b) The holder of an aircraft maintenance licence may not exercise its privileges unless: 1. in compliance with the applicable requirements of HKAR-145, or the limitations in the licence for simple light aeroplanes and some helicopters as determined necessary by the Director-General, whichever applicable. 2. in the preceding two-year period he/she has, either had six months of maintenance experience in accordance with the privileges granted by the aircraft maintenance licence or, met the provision for the issue of the appropriate privileges. 3. he/she has the adequate competence to certify maintenance on corresponding aircraft; and 4. he/she is able to read, write and communicate to an understandable level in the language(s) in which the technical documentation and procedures necessary to support the issue of the certificate of release to service are written. HKAR 66.25 Basic knowledge requirements (See AMC 66.25 and GM 66.25) (a) An applicant for an aircraft maintenance licence, or the addition of a category or subcategory to such a licence, shall demonstrate by examination a level of knowledge in the appropriate subject modules in accordance with Section 4 Appendix I to this requirement. The examination shall be conducted either by a training organisation appropriately approved in accordance with HKAR-147 or by the Director-General. Note: HKAR-66 Section 4 Appendix I contains detailed information on levels of knowledge for categories A, B1, B2*, B3 and C. (b) The training courses and examinations shall be passed within 10 years prior to the application for an aircraft maintenance licence or the addition of a category or subcategory to such aircraft maintenance licence. Should this not be the case, examination credits may however be obtained in accordance with paragraph (c). (c) The applicant may apply to the Director-General for full or partial examination credit to the basic knowledge requirements for: 1. basic knowledge examinations that do not meet the requirement described in paragraph (b) above; and 2. any other technical qualification considered by the Director-General to be equivalent to the knowledge standard of HKAR-66. (d) Credits expire 10 years after they were granted to the applicant by the Director-General. The applicant may apply for new credits after expiration. SECTION 1 HKAR-66 5 July 2024 1-8 ISSUE 3 Revision 4 HKAR 66.30 Basic experience requirements (See AMC 66.30) (a) An applicant for an aircraft maintenance licence shall have acquired: 1. for category A, subcategories B1.2 and B1.4 and category B3: (i) 3 years of practical maintenance experience on operating aircraft, if the applicant has no previous relevant technical training; or (ii) 2 years of practical maintenance experience on operating aircraft and completion of training considered relevant by the Director-General as a skilled worker, in a technical trade; or (iii) 1 year of practical maintenance experience on operating aircraft and completion of a basic training course approved in accordance with HKAR-147; 2. for category B2* and subcategories B1.1 and B1.3: (i) 5 years of practical maintenance experience on operating aircraft if the applicant has no previous relevant technical training; or (ii) 3 years of practical maintenance experience on operating aircraft and completion of training considered relevant by the Director-General as a skilled worker, in a technical trade; or (iii) 2 years of practical maintenance experience on operating aircraft and completion of a basic training course approved in accordance with HKAR-147; or (iv) 3 years of practical maintenance experience on operating aircraft and completion of training acceptable to CAD for a graduated candidate holding an appropriate engineering degree. 3. for category C with respect to complex motor-powered aircraft: (i) 3 years of experience exercising category B1.1, B1.3 or B2/B2* privileges on complex motor-powered aircraft or as support staff according to HKAR 145.35, or, a combination of both; or (ii) 5 years of experience exercising category B1.2 or B1.4 privileges on complex motor- powered aircraft or as support staff according to HKAR 145.35, or a combination of both; 4. for category C with respect to other than complex motor-powered aircraft: 3 years of experience exercising category B1 or B2/B2* privileges on other than complex motor-powered aircraft or as support staff according to HKAR 145.35, or a combination of both; SECTION 1 HKAR-66 5 July 2024 1-9 ISSUE 3 Revision 4 5. for category C obtained through the academic route: an applicant holding an academic degree in a technical discipline, from a university or other higher educational institution recognised by the Director-General, 3 years of experience working in a civil aircraft maintenance environment on a representative selection of tasks directly associated with aircraft maintenance including 6 months of observation of base maintenance tasks. (b) An applicant for an extension to an aircraft maintenance licence shall have a minimum civil aircraft maintenance experience requirement appropriate to the additional category or subcategory of licence applied for as defined in Section 4 Appendix IV and take the examination as defined in Section 4 Appendix XIX. (c) The experience shall be practical and involve a representative cross section of maintenance tasks on aircraft. (d) At least 1 year of the required experience shall be recent maintenance experience on aircraft of the category/subcategory for which the initial aircraft maintenance licence is sought. For subsequent category/subcategory additions to an existing aircraft maintenance licence, the additional recent maintenance experience required may be less than 1 year, but shall be at least 3 months. The required experience shall be dependent upon the difference between the licence category/subcategory held and applied for. Such additional experience shall be typical of the new licence category/subcategory sought. (e) Notwithstanding point (a), aircraft maintenance experience gained outside a civil aircraft maintenance environment shall be accepted when such maintenance is equivalent to that required by this HKAR-66 as established by the Director-General. Additional experience of civil aircraft maintenance shall, however, be required to ensure adequate understanding of the civil aircraft maintenance environment. (f) Experience shall have been acquired within the 10 years preceding the application for an aircraft maintenance licence or the addition of a category or subcategory to such a licence. SECTION 1 HKAR-66 5 July 2024 1-10 ISSUE 3 Revision 4 HKAR 66.40 Continued validity of the aircraft maintenance licence (See GM 66.40) (a) An aircraft maintenance licence shall remain valid for the period as specified in it, but not to exceed 5 years. Upon receipt of an application for renewal in accordance with Section 4 Appendix XII, the Director-General may renew the applicant’s licence if being satisfied that he/she is a fit person and appropriately qualified in accordance with HKAR- 66. (b) The holder of an aircraft maintenance licence shall apply for renewal in accordance with HKAR 66.10(a). (c) Any certification privilege based upon an aircraft maintenance licence becomes invalid as soon as the aircraft maintenance licence is invalid. (d) The aircraft maintenance licence is only valid when issued, renewed and / or amended by the Director-General and when the holder has signed the document. HKAR 66.45 Endorsement with aircraft ratings (See AMC 66.45 and GM 66.45) (a) In order to be entitled to exercise certification privileges on a specific aircraft type, the holder of an aircraft maintenance licence need to have his / her licence endorsed with the relevant aircraft ratings. For category B1, B2*, B3 or C the relevant aircraft ratings are the following: 1. For group 1 aircraft, the appropriate aircraft type rating. 2. For group 2 aircraft, the appropriate aircraft type rating, manufacturer subgroup rating or full subgroup rating. 3. For group 3 aircraft, the appropriate aircraft type rating or full group rating. For category B3, the relevant rating is ‘piston-engine non-pressurised aeroplanes with MTOM of 2000 kg and below’. For category A, no rating is required, subject to compliance with the requirements of HKAR 145.35. (b) The endorsement of aircraft type ratings requires the satisfactory completion of the relevant category B1, B2* or C aircraft type training. (c) In addition to the requirement of paragraph (b), the endorsement of the first aircraft type rating within a given category/subcategory requires satisfactory completion of the corresponding On the Job Training, as described in Section 4 Appendix III. (d) By derogation from paragraphs (b) and (c), for group 2 and 3 aircraft, aircraft type ratings may also be granted after: SECTION 1 HKAR-66 5 July 2024 1-11 ISSUE 3 Revision 4 − satisfactory completion of the relevant category B1, B2* or C aircraft type examination described in Section 4 Appendix III, and − in the case of B1 and B2* category, demonstration of practical experience on the aircraft type. In that case, the practical experience shall include a representative cross section of maintenance activities relevant to the licence category. In the case of a category C rating for a person qualified by holding an academic degree as specified in point HKAR 66.30(a)(5), the first relevant aircraft type examination shall be at the category B1 or B2/B2* level. (e) For group 2 aircraft: 1. the endorsement of manufacturer subgroup ratings for category B1 and C licence holders requires complying with the aircraft type rating requirements of at least two aircraft types from the same manufacturer which combined are representative of the applicable manufacturer subgroup; 2. the endorsement of full subgroup ratings for category B1 and C licence holders requires complying with the aircraft type rating requirements of at least three aircraft types from different manufacturers which combined are representative of the applicable subgroup; 3. the endorsement of manufacturer subgroups and full subgroup ratings for category B2* licence holders requires demonstration of practical experience which shall include a representative cross section of maintenance activities relevant to the licence category and to the applicable aircraft subgroup. (f) For group 3 aircraft: 1. the endorsement of the full group 3 rating for category B1, B2* and C licence holders requires demonstration of practical experience, which shall include a representative cross section of maintenance activities relevant to the licence category and to the group 3. 2. for category B1, unless the applicant provides evidence of appropriate experience, the group 3 rating shall be subject to the following limitations, which shall be endorsed on the licence: G 01 – Aeroplanes with metal tubing structure covered with fabric. G 02 – Composite structure aeroplanes G 03 – Metal structure aeroplanes G 04 – Pressurised aeroplanes (B1.2 licence ONLY) G 05 – Wooden structure aeroplanes SECTION 1 HKAR-66 5 July 2024 1-12 ISSUE 3 Revision 4 (g) For the B3 licence: 1. the endorsement of the rating ‘piston-engine non-pressurised aeroplanes with MTOM of 2000 kg and below’ requires demonstration of practical experience which shall include a representative cross-section of maintenance activities relevant to the licence category. 2. unless the applicant provides evidence of appropriate experience, the rating referred to in paragraph 1 shall be subject to the following limitations, which shall be endorsed on the licence: G 01 – Aeroplanes with metal tubing structure covered with fabric. G 02 – Composite structure aeroplanes G 03 – Metal structure aeroplanes G 05 – Wooden structure aeroplanes HKAR 66.47 Medical fitness (See GM 66.47) Certifying staff must not exercise the privileges of their certification authorisation if they know or suspect that their physical or mental condition renders them unfit to exercise such privileges. HKAR 66.50 Limitations (See AMC 66.50) (a) Limitations introduced on an aircraft maintenance licence are exclusions from the certification privileges and affect the aircraft in its entirety. (b) For limitations referred to in HKAR 66.45, limitations shall be removed upon: 1. demonstration of appropriate experience; or 2. after a satisfactory practical assessment performed by the Director-General. (c) For limitations referred to in HKAR 66.70, limitations shall be removed upon satisfactory completion of examination on those modules / subjects defined in Section 4 Appendix XIX. SECTION 1 HKAR-66 5 July 2024 1-13 ISSUE 3 Revision 4 HKAR 66.55 Evidence of qualification (See GM 66.55) Personnel exercising certification privileges as well as support staff shall produce their licence, as evidence of qualification, within 24 hours upon request by an authorised person. HKAR 66.60 Equivalent safety cases (See AMC 66.60) The Director-General may exempt any person, required to be qualified in accordance with HKAR-66, from any requirement in HKAR-66 when satisfied that a situation exists not covered by HKAR-66 and subject to compliance with any supplementary condition(s) the Director-General considers necessary to ensure equivalent safety. Such exemption and supplementary condition(s) must be agreed by the Director-General to ensure continued recognition of the person. HKAR 66.65 Revocation, suspension or limitation of the HKAR-66 aircraft maintenance licence (a) The Director-General may, on reasonable grounds after due enquiry, revoke, suspend or limit the HKAR-66 aircraft maintenance licence or direct the HKAR-145 approved maintenance organisation to revoke, suspend or limit the HKAR-145 certification authorisation if the Director-General is not satisfied that the holder of the licence and authorisation is a fit and proper person to hold such licence and authorisation subject to the conditions of paragraph (a)(1) or (a)(2) as appropriate. 1. Before revoking or limiting the HKAR-66 aircraft maintenance licence or directing the HKAR-145 approved maintenance organisation, the Director-General must first give at least 28 days notice to the affected party or parties in writing of his/her intention so to do and the reasons for its proposal and must offer the affected party or parties an opportunity to make representations and the Director-General will consider those representations. 2. In the case where the Director-General has determined that the safe operation of the aircraft is adversely affected, the Director-General may in addition to sub- paragraph (a)(1) provisionally suspend the HKAR-66 aircraft maintenance licence without prior notice until the sub-paragraph (a)(1) procedure is complete. (b) For the Director-General to consider a person to be not a fit and proper person means that there is clear evidence that the person has knowingly carried out or been involved in one or more of the following activities: 1. Obtained the HKAR-66 aircraft maintenance licence and/or the HKAR-145 certification authorisation by falsification of submitted evidence. 2. Failed to carry out requested maintenance combined with failure to report such fact to SECTION 1 HKAR-66 5 July 2024 1-14 ISSUE 3 Revision 4 the organisation that requested the maintenance. 3. Failed to carry out required maintenance resulting from own inspection combined with failure to report such fact to the organisation for whom the maintenance was intended to be carried out. 4. Negligent maintenance. 5. Falsification of the maintenance record. 6. The issue of a certificate of release to service knowing that the maintenance specified on the certificate of release to service has not been carried out or without verifying that such maintenance has been carried out. 7. Carrying out maintenance or issuing a certificate of release to service when adversely affected by alcohol or drugs. HKAR 66.70 Conversion provisions (See AMC 66.70 and GM 66.70) (a) Personnel qualified to exercise certification privileges in accordance with Hong Kong aviation regulations valid before the effective date of HKAR-66, remain eligible to exercise those privileges. (b) Personnel undergoing a qualification process equivalent to the appropriate HKAR-66 requirements before 1 April 2004, may complete such qualification process in accordance with Section 4 Appendix XIV. The qualifications gained will be recognised as pre- existing certification privileges in accordance with paragraph (a). (c) Personnel qualified in accordance with paragraph (a) or (b) must be issued a HKAR-66 aircraft maintenance licence. Limitations will be applied where appropriate to the basic licence and to aircraft types or group ratings reflecting the scope of the certification privileges previously held prior to conversion. To remove limitations, the relevant conversion examinations must be passed and any appropriate experience requirements met. (d) Personnel holding HKAR-AMEL may apply for conversion to HKAR-66 licence in accordance with Section 4 Appendix XVII. (e) Personnel holding non HKAR-66 licences, as listed in Section 4 Appendix XVIII may apply for conversion to HKAR-66 licence in accordance with the Appendix. SECTION 2 HKAR-66 8 November 2018 2-0-1 ISSUE 3 SECTION 2 - ACCEPTABLE MEANS OF COMPLIANCE (AMC) 1 GENERAL 1.1 This Section contains Acceptable Means of Compliance that has been agreed for inclusion in HKAR-66. Acceptable Means of Compliance (AMC) illustrate a means, or several alternative means, but not necessarily the only possible means by which a requirement can be met. 1.2 Where a particular HKAR paragraph does not have an Acceptable Means of Compliance or any Guidance Material, it is considered that no supplementary material is required. 2 PRESENTATION 2.1 The Acceptable Means of Compliance is presented in full page width on loose pages, each page being identified by the date of issue or the issue/revision number under which it is reissued or amended. 2.2 A numbering system has been used in which the Acceptable Means of Compliance uses the same number as the HKAR paragraph to which it refers. The number is introduced by the letters AMC to distinguish the material from the HKAR itself. 2.3 Explanatory Notes not forming part of the AMC text appear in a smaller typeface. 2.4 New, amended or corrected text is indicated by a marginal line. SECTION 2 HKAR-66 5 July 2024 2-1 ISSUE 3 Revision 4 AMC 66.10 Application 1. Application of issue, extension or renewal of HKAR-66 aircraft maintenance license should be submitted via PLIS website https://plis.cad.gov.hk/ by using personal account. Guidance for different types of application is embedded in the PLIS. 2. Maintenance experience should written up in a manner that the reader has a reasonable understanding of where, when and what maintenance constitutes the experience. A task by task account is not necessary but at the same time a bland statement ‘X years maintenance experience completed’ is not acceptable. A log book of maintenance experience is desirable and some authorities may require such log book to be kept. It is acceptable to cross refer in the application to other documents containing information on maintenance. 3. Applicants claiming the maximum reduction in HKAR 66.30(a) total experience based upon having successfully completed HKAR 147.200 approved basic training should include the HKAR-147 certificate of recognition for approved basic training. 4. Applicants claiming reduction in HKAR 66.30(a) total experience based upon having successfully completed technical training in an organisation or institute recognised by the Director-General as a competent organisation or institute, should include the relevant certificate of successful completion of training. AMC 66.20(b)2 Privileges The 6 months maintenance experience in 2 years should be understood as consisting of two elements, duration and nature of the experience. The minimum to meet the requirements for these elements may vary depending on the size and complexity of the aircraft and type of operation and maintenance. 1. Duration Within an approved maintenance organisation: - 6 months continuous employment within the same organisation; or - 6 months split up into different blocks, employed within the same or in different organisations The 6 months period can be replaced by 100 days of maintenance experience in accordance with the privileges, whether they have been performed within an approved organisation or as independent certifying staff in compliance with the requirements laid down in HKAR-66 except for complex maintenance tasks, or as a combination thereof. When licence holder maintains and releases aircraft as the above-mentioned independent certifying staff, in certain circumstances this number of days may even be reduced by 50% when agreed in advance by the Director-General. These circumstances consider the cases where the licence holder happens to be the owner of an aircraft and carries out SECTION 2 HKAR-66 5 July 2024 2-2 ISSUE 3 Revision 4 maintenance on his own aircraft, or where a licence holder maintains an aircraft operated for low utilization, that does not allow the licence holder to accumulate the required experience. This reduction should not be combined with the 20% reduction permitted when carrying out technical support, or maintenance planning, continuing airworthiness management or engineering activities. To avoid a too long period without experience, the working days should be spread over the intended 6 months period. 2. Nature of the experience: Depending on the category of the aircraft maintenance licence, the following activities are considered relevant for maintenance experience: - Servicing; - Inspection; - Operational and functional testing; - Trouble-shooting; - Repairing; - Modifying; - Changing component; - Supervising these activities; - Releasing aircraft to service. For category A licence holders, the experience should include exercising the privileges, by means of performing tasks related to the authorisation on at least one aircraft type for each licence subcategory. This means tasks as mentioned in AMC 145.30(g), including servicing, component changes and simple defect rectifications. For category B1, B2/B2* and B3, for every aircraft included in the authorisation the experience should be on that particular aircraft or on a similar aircraft within the same licence (sub)category. Two aircraft can be considered as similar when they have similar technology, construction and comparable systems, which means equally equipped with the following (as applicable to the licence category): - Propulsion systems (piston, turboprop, turbofan, turboshaft, jet-engine or push propellers); and - Flight control systems (only mechanical controls, hydro-mechanically powered controls or electro-mechanically powered controls); and - Avionic systems (analogue systems or digital systems); and - Structure (manufactured of metal, composite or wood). For licences endorsed with (sub)group ratings: - In the case of B1 licence endorsed with (sub)group ratings (either manufacturer sub-group or full (sub)group) as defined in HKAR 66.45 the holder should show experience on at least one aircraft type per (sub)group and per aircraft structure (metal, composite, wood). SECTION 2 HKAR-66 5 July 2024 2-3 ISSUE 3 Revision 4 - In the case of a B2/B2* licence endorsed with (sub)group ratings (either manufacturer subgroup or full (sub)group) as defined in HKAR 66.45 the holder should show experience on at least one aircraft type per (sub)group. - In the case of a B3 licence endorsed with the rating ‘piston-engine non-pressurised aeroplanes with MTOM of 2000 kg and below’ as defined in HKAR 66.45, the holder should show experience on at least one aircraft type per aircraft structure (metal, composite, wooden). For category C, the experience should cover at least one of the aircraft types endorsed on the licence. For a combination of categories, the experience should include some activities of the nature shown in paragraph 2 in each category. A maximum of 20% of the experience duration required may be replaced by the following relevant activities on an aircraft type of similar technology, construction and with comparable systems: - Aircraft maintenance related training as an instructor/assessor or as a student; - Maintenance technical support / engineering; - Maintenance management / planning. The experience should be documented in an individual log book or in any other recording system (which may be an automated one) containing the following data: - Date; - Aircraft type; - Aircraft identification i.e. registration; - ATA chapter (optional); - Operation performed i.e. 100 FH check, MLG wheel change, engine oil check and - complement, SB embodiment, trouble shooting, structural repair, STC embodiment…; - Type of maintenance i.e. base, line; - Type of activity i.e. perform, supervise, release; - Category used A, B1, B2*, B3 or C. - Duration in days or partial-days AMC 66.20(b)3 Privileges The wording ‘has the adequate competence to certify maintenance on the corresponding aircraft’ means that the licence holder and, if applicable, the organisation where he/she is contracted/employed, should ensure that he/she has acquired the appropriate knowledge, skills, attitude and experience to release the aircraft being maintained. This is essential because some systems and technology present in the particular aircraft being maintained may not have been covered by the training/examination/experience required to obtain the licence and SECTION 2 HKAR-66 5 July 2024 2-4 ISSUE 3 Revision 4 ratings. This is typically the case, among others, in the following situations: - Type ratings which have been endorsed on a licence in accordance with Section 5 Appendix I ‘Aircraft type ratings for HKAR-66 aircraft maintenance licences’ after attending type training/on-the-job training which did not cover all the models/variants included in such rating. For example, a licence endorsed with the rating Airbus A318/A319/A320/A321 (CFM56) after attending type training/on-the-job training covering only the Airbus A320 (CFM56). - Type ratings which have been endorsed on a licence in accordance with Section 5 Appendix I ‘Aircraft type ratings for HKAR-66 aircraft maintenance licences’ after a new variant has been added to the rating in Section 5 Appendix I, without performing difference training. For example, a licence endorsed with the rating Boeing 737- 600/700/800/900 for a person who already had the rating Boeing 737-600/700/800, without performing any difference training for the Boeing 737-900. - Work being carried out on a model/variant for which the technical design and maintenance techniques have significantly evolved from the original model used in the type training/on-the- job training. - Specific technology and options selected by each customer which may not have been covered by the type training/on-the-job training. - Changes in the basic knowledge requirements of Section 4 Appendix I not requiring re- examination of existing licence holders (grandfathered privileges). - The endorsement of group/subgroup ratings based on experience on a representative number of tasks/aircraft or based on type training/examination on a representative number of aircraft. - Persons meeting the requirements of 6 months of experience every 2 years only on certain similar aircraft types as allowed by AMC 66.20(b)2. - Persons holding a HKAR-66 licence with limitations, obtained through conversion of HKAR-AMEL (HKAR 66.70), where such limitations are going to be lifted after performing the corresponding basic knowledge examinations. In this case, the type ratings endorsed in the licence may have been obtained in the national system without covering all the aircraft systems (because of the previous limitations) and there will be a need to assess and, if applicable, to train this person on the missing systems. Additional information is provided in AMC 145.35(a). AMC 66.25 Basic knowledge requirements 1. For an applicant being a person qualified by holding an academic degree in an aeronautical, mechanical or electronic discipline from a recognised university or other higher educational institute the need for any examination will depend upon the course SECTION 2 HKAR-66 5 July 2024 2-5 ISSUE 3 Revision 4 taken in relation to Section 4 Appendix I. Note: Any university or other higher educational institute accredited by the Hong Kong Council for Academic Accreditation is recognised by the Director-General. 2. Knowledge gained and examinations passed during previous experiences, for example, in military aviation and civilian apprenticeships will be credited where the Director- General is satisfied that such knowledge and examinations are equivalent to that required by Section 4 Appendix I. 3. The basic knowledge examinations may be conducted by an appropriately approved HKAR-147 training organisation or by the Director-General. 4. The mix of results from module examination conducted by appropriately approved HKAR-147 training organisations and the Director-General is not acceptable. AMC 66.30(a) Basic experience requirements 1. For a category C applicant holding an academic degree the representative selection of tasks should include the observation of hangar maintenance, maintenance planning, quality assurance, record-keeping, approved spare parts control and engineering development. 2. While an applicant to a category C licence may be qualified by having 3 years experience as category B1 or B2/B2* certifying staff only in line maintenance, it is however recommended that any applicant to a category C holding a B1 or B2/B2* licence demonstrate at least 12 months experience as a B1 or B2/B2* support staff. 3. A skilled worker is a person who has successfully completed a training, acceptable to the Director-General, involving the manufacture, repair, overhaul or inspection of mechanical, electrical or electronic equipment. The training would include the use of tools and measuring devices. 4. Maintenance experience on operating aircraft: - Means the experience of being involved in maintenance tasks on aircraft which are being operated by airlines, air taxi organisations, owners, etc: - Should cover a wide range of tasks in length, complexity and variety; - Aims at gaining sufficient experience in the real environment of maintenance as opposed to only the training school environment. - May be gained within different types of maintenance organisations (HKAR-145, FAR-145, etc) or under the supervision of independent certifying staff; - May be combined with HKAR-147 approved training so that periods of training can SECTION 2 HKAR-66 5 July 2024 2-6 ISSUE 3 Revision 4 be intermixed with periods of experience, similar to an apprenticeship. 5. A graduated candidate category B applicant holding an appropriate engineering degree means an applicant holding an academic degree in a technical discipline from a university or other higher educational institution, and has successfully completed a structured training programme acceptable to the Director-General. The 3 years experience means working in a civil aircraft maintenance environment on a selection of tasks including the maintenance planning, quality assurance, and at least 24 months practical experience in line and / or base maintenance. AMC 66.30(d) Basic experience requirements 1. To be considered as recent experience; at least 50% of the required 12-month recent experience should be gained within the 12-month period prior to the date of application for the aircraft maintenance licence. The remainder of the recent experience should have been gained within the 7-year period prior to application. It must be noted that the rest of the basic experience required by HKAR 66.30 must be obtained within the 10 years prior to the application as required by HKAR 66.30(f). 2. Different aircraft types may be considered to be typical when the construction and operation of the airframe, powerplant, systems including avionic systems are of similar technology. AMC 66.30(e) Basic experience requirements 1. For category A the additional experience of civil aircraft maintenance should be a minimum of 6 months. For category B1, B2* or B3 the additional experience of civil aircraft maintenance should be a minimum of 12 months. 2. Aircraft maintenance experience gained outside a civil aircraft maintenance environment may include aircraft maintenance experience gained in armed forces, coast guards, police etc. or in aircraft manufacturing. AMC 66.45(d), (e)3, (f)1 and (g)1 Endorsement with aircraft ratings 1. The ‘practical experience’ should cover a representative cross section including at least 50% of tasks contained in Section 5 Appendix II relevant to the licence category and to the applicable aircraft type ratings or aircraft (sub)group ratings being endorsed. This experience should cover tasks from each paragraph of the Section 5 Appendix II list. Other tasks than those in the Section 5 Appendix II may be considered as a replacement when they are relevant. In the case of (sub)group ratings, this experience may be shown by covering one or several aircraft types of the applicable (sub)group and may include experience on aircraft classified in group 1, 2 and / or 3 as long as the experience is relevant. The practical experience should be obtained under the supervision of authorised certifying staff. SECTION 2 HKAR-66 5 July 2024 2-7 ISSUE 3 Revision 4 2. In the case of endorsement of individual type ratings for group 2 and group 3 aircraft, for the second aircraft type of each manufacturer (sub)group the practical experience should be reduced to 30% of the tasks contained in the Section 5 Appendix II relevant to the licence category and to the applicable aircraft type. For subsequent aircraft types of each manufacturer (sub) group this should be reduced to 20%. 3. Practical experience should be demonstrated by the submission of records or a log book showing the Section 4 Appendix II tasks performed by the applicant. Typical data to be recorded are similar to those described in AMC 66.20(b)2. AMC 66.45(e) Endorsement with aircraft ratings 1. For the granting of manufacturer subgroup ratings for group 2 aircraft, for B1 and C licence holders, the sentence ‘at least two aircraft types from the same manufacturer which combined are representative of the applicable manufacturer subgroup’ means that the selected aircraft types should cover the technologies relevant to the manufacturer subgroup in the following areas: - Flight control systems (mechanical controls / hydro-mechanically powered controls / electro-mechanically powered controls); and - Avionic systems (analogue systems / digital systems); and - Structure (manufactured of metal / composite / wood). In cases where there are very different aircraft types within the same manufacturer subgroup, it may be necessary to cover more than two aircraft types to ensure adequate representation. For this purpose it may be possible to use aircraft types from the same manufacturer classified in group 1 as long as the selected aircraft belong to the same licence subcategory for which the rating will be endorsed. 2. For the granting of full subgroup ratings for group 2 aircraft, for B1 and C licence holders, the sentence ‘at least three aircraft types from different manufacturers which combined are representative of the applicable subgroup’ means that the selected aircraft types should cover all the technologies relevant to the manufacturer subgroup in the following areas: - Flight control systems (mechanical controls / hydro-mechanically powered controls / electro-mechanically powered controls); and - Avionic systems (analogue systems / digital systems); and - Structure (manufactured of metal / composite / wood). SECTION 2 HKAR-66 5 July 2024 2-8 ISSUE 3 Revision 4 In cases where there are very different aircraft types within the same subgroup, it may be necessary to cover more than three aircraft types to ensure adequate representation. For this purpose it may be possible to use aircraft types from different manufacturers classified in group 1 as long as the selected aircraft belong to the same licence subcategory for which the rating will be endorsed. 3. For manufacturer subgroup ratings, the term ‘manufacturer’ means the TC holder defined in the certification data sheet, which is reflected in the list of type ratings in Section 5 Appendix I. In the case of an aircraft rating where the type rating refers to a TC holder made of a combination of two manufacturers which produce a similar aircraft (i.e. AGUSTA / BELL HELICOPTER TEXTRON or any case of aircraft similarly built by another manufacturer) this combination should be considered as one manufacturer. As a consequence: - When a licence holder gets a manufacturer type or a manufacturer subgroup rating made of a combination of manufacturers, it covers the combination of such manufacturers. - When a licence holder who intends to endorse a full subgroup rating selects three aircraft from different manufacturers, this means from different combinations of manufacturers as applicable. AMC 66.50(b) Limitations 1. The appropriate experience required to remove the limitations referred in HKAR 66.45(f) and (g) should consist of the performance of a variety of tasks appropriate to the limitations under the supervision of authorised certifying staff. This should include the tasks required by a scheduled annual inspection. Alternatively, this experience may also be gained, if agreed by the Director-General, by theoretical and practical training provided by the manufacturer, as long as an assessment is further carried out and recorded by this manufacturer. 2. It may be acceptable to have this experience on just one aircraft type, provided this type is representative of the (sub)group in relation to the limitation being removed. 3. The application for the limitation removal should be supported by a record of experience signed by the authorised certifying staff or by an assessment signed by the manufacturer after completion of the applicable theoretical and practical training. SECTION 2 HKAR-66 5 July 2024 2-9 ISSUE 3 Revision 4 AMC 66.60 Equivalent safety cases All proposed equivalent safety cases should be agreed in principle with the Director-General before they are submitted to the Director-General for consideration as an acceptable case. AMC 66.70 Conversion provisions 1. HKAR 66.70(a) 'personnel qualified to exercise certification privileges' means: - Personnel holding a pre HKAR-66 licence with or without certification privileges, or, - Personnel holding a pre HKAR-66 licence with or without certification privileges and a current HKAR-145 certification authorisation, or, - Personnel do not hold any Hong Kong licence, but, hold a current HKAR-145 certification authorisation in accordance with that HKAR-145 approved maintenance organisation’s approved procedures. 2. HKAR 66.70(b) 'personnel undergoing a qualification process' means: - Personnel who have passed some of the examinations leading to a Hong Kong licence, or, - Personnel undergoing a course of approved basic or type training. 3. Personnel holding pre HKAR-66 qualifications in accordance with paragraphs HKAR 66.70(a) or (b) will be granted a HKAR-66 aircraft maintenance licence per HKAR 66.70(c) in the appropriate category/subcategory without further examination except that such licence will contain limitations in relation to the certification privileges previous held prior to conversion. 4. Personnel who wish to remove limitations from their HKAR-66 licence as specified in HKAR 66.70(c) or to add other basic category/subcategory to their HKAR-66 licence as specified in HKAR 66.70(d) have to sit and pass the appropriate conversion examinations. Modules / sub-modules, listed in Section 4 Appendix I with the exception of human factors, that are required for conversion examinations should limit to those technical subjects that have not previously been examined and/or not covered by relevant experience by the personnel. 5. The policies with regard to conversion examinations are as follows. - With regard to those subjects not previously examined, this means those subjects that are contained in each relevant subject module of Section 4 Appendix I but were not, or are not, specified in the relevant Hong Kong licence standard. Where if the total number of multi-choice questions required for the conversion examination is less than 15, then such conversion examination is not required. This is based on the consideration that the difference in technical knowledge is so minimal that such SECTION 2 HKAR-66 5 July 2024 2-10 ISSUE 3 Revision 4 examination is deemed not necessary. - With regard to those subjects covered by relevant experience, this means the knowledge requirement for those subjects that are contained in each relevant subject module of Section 4 Appendix I has been assessed and considered to be satisfied by the applicant’s past and current experience. A good example is module M7A 'Maintenance Practices'. - With regard to sub-paragraphs (a) and (b), it should generally be acceptable to partially exempt personnel from conversion examinations on subject modules in relation to Section 4 Appendix I, dependant upon their existing qualification, expertise and experience as specified in sub-paragraphs (d) and (e). - 'Mechanical' personnel do not need to be examined in modules M1, M2, M6, M7A or M7B as applicable, M8 or M10 except that to support conversion to module M11A, M11B or M11C as applicable, or M12 personnel will need to be examined in module M8 and to support conversion to module M16 or M17A or M17B as applicable personnel will need to be examined in module M2 subject 2.3. 'Mechanical' personnel will need to be examined in modules M3, M4 M5 and as applicable in whole or in part in modules M11A, M11B or M11C as applicable, M12, M15, M16 or M17A or M17B as applicable unless previously examined under the Hong Kong aviation regulations prior to HKAR-66. Modules M13 and M14 are not relevant to the mechanical discipline. - 'Avionic' personnel do not need to be examined in modules M1, M2, M4, M6, M7A or M7B as applicable, or M10. 'Avionic' personnel will need to be examined in modules M3, M5, M8, M14 and the applicable parts of module M13 unless previously examined under the Hong Kong aviation regulations prior to HKAR-66. Modules M11A, M11B or M11C as applicable, M12, M15, M16 and M17A or M17B as applicable are not relevant to the avionic discipline. - The exemption from Human Factors (HF), module M9A, is only applicable to those personnel who have attended a CAD approved HF training course before the conversion. 6. Personnel undertaking conversion to the full HKAR-66 licence will still need to show that they meet the experience requirement of HKAR 66.30. SECTION 3 HKAR-66 8 November 2018 3-0-1 ISSUE 3 SECTION 3 - GUIDANCE MATERIAL (GM) 1 GENERAL 1.1 This Section contains Guidance Material that has been agreed for inclusion in HKAR-66. 1.2 Where a particular HKAR paragraph does not have an Acceptable Means of Compliance or any Guidance Material, it is considered that no supplementary material is required. 2 PRESENTATION 2.1 The Guidance Material is presented in full page width on loose pages, each page being identified by the date of issue or the issue/revision number under which it is reissued or amended. 2.2 A numbering system has been used in which the Guidance Material uses the same number as the HKAR paragraph to which it refers. The number is introduced by the letters GM to distinguish the material from the HKAR itself. 2.3 Guidance Material (GM) helps to illustrate the meaning of a requirement. 2.4 Explanatory Notes not forming part of the GM text appear in a smaller typeface. 2.5 New, amended or corrected text is indicated by a marginal line. INTENTIONALLY LEFT BLANK SECTION 3 HKAR-66 5 July 2024 3-1 ISSUE 3 Revision 4 GM 66.3 Licence categories Individual aircraft maintenance licence holders need not be restricted to a single category. Provided that each qualification requirement is satisfied, any combination of categories may be granted. GM 66.20 (a) Privileges 1. The following definitions apply: Avionics system means an aircraft system that transfers, processes, displays or stores analogue or digital data using data lines, data buses, coaxial cables, wireless or other data transmission medium, and includes the system’s components and connectors. Examples of avionics systems include the following: - Autoflight; - Communication, Radar and Navigation; - Instruments (see NOTE below); - In Flight Entertainment Systems; - Integrated Modular Avionics (IMA); - On-Board Maintenance Systems; - Information Systems; - Fly by Wire Systems (related to ATA27 ‘Flight Controls’); - Fibre Optic Control Systems. Note: Instruments are formally included within the privileges of the B2/B2* licence holders. However, maintenance on electromechanical and pitot-static components may also be released by a B1 licence holder. Base Maintenance means any task falling outside the criteria that are given below for Line Maintenance. Note: Aircraft maintained in accordance with ‘progressive’ type programmes need to be individually assessed in relation to this paragraph. In principle, the decision to allow some ‘progressive’ checks to be carried out is determined by the assessment that all tasks within the particular check can be carried out safely to the required standards at the designated line maintenance station. Electrical system means the aircraft electrical power supply source, plus the distribution system to the different components contained in the aircraft and relevant connectors. Lighting systems are also included in this definition. When working on cables and connectors which are part of these electrical systems, the following typical practices are included in the privileges: - Continuity, insulation and bonding techniques and testing; - Crimping and testing of crimped joints; - Connector pin removal and insertion; SECTION 3 HKAR-66 5 July 2024 3-2 ISSUE 3 Revision 4 - Wiring protection techniques. Line maintenance means any maintenance that is carried out before flight to ensure that the aircraft is fit for the intended flight. It may include: - trouble shooting; - defect rectification; - component replacement with use of external test equipment, if required. Component replacement may include components such as engines and propellers; - scheduled maintenance and/or checks including visual inspections that will detect obvious unsatisfactory conditions/discrepancies but do not require extensive in depth inspection. It may also include internal structure, systems and powerplant items which are visible through quick opening access panels/doors; - minor repairs and modifications which do not require extensive disassembly and can be accomplished by simple means; - for temporary or occasional cases (Airworthiness Directives, hereinafter AD; service bulletins, hereinafter SB) the quality manager may accept base maintenance tasks to be performed by a line maintenance organisation provided all requirements are fulfilled. The Director-General will prescribe the conditions under which these tasks may be performed. Simple test means a test described in approved maintenance data and meeting all the following criteria: - The serviceability of the system can be verified using aircraft controls, switches, Built-in Test Equipment (BITE), Central Maintenance Computer (CMC) or external test equipment not involving special training. - The outcome of the test is a unique go – no go indication or parameter, which can be a single value or a value within an interval tolerance. No interpretation of the test result or interdependence of different values is allowed. - The test does not involve more than 10 actions as described in the approved maintenance data (not including those required to configure the aircraft prior to the test, i.e. jacking, flaps down, etc, or to return the aircraft to its initial configuration). Pushing a control, switch or button, and reading the corresponding outcome may be considered as a single step even if the maintenance data shows them separated. Troubleshooting means the procedures and actions necessary, using approved maintenance data, in order to identify the root cause of a defect or malfunction. It may SECTION 3 HKAR-66 5 July 2024 3-3 ISSUE 3 Revision 4 include the use of BITE or external test equipment. 2. The category B3 licence does not include any A subcategory. Nevertheless, this does not prevent the B3 licence holder from releasing maintenance tasks typical of the A1.2 subcategory for piston-engine non-pressurised aeroplanes with MTOM of 2000 kg and below, within the limitations contained in the B3 licence. 3. The category C licence permits certification of scheduled base maintenance by the issue of a single certificate of release to service for the complete aircraft after the completion of all such maintenance. The basis for this certification is that the maintenance has been carried out by competent mechanics and category B1, B2 / B2* and B3 support staff, as appropriate, have signed for the maintenance tasks under their respective specialisation. The principal function of the category C certifying staff is to ensure that all required maintenance has been called up and signed off by the category B1, B2/B2* and B3 support staff, as appropriate, before issue of the certificate of release to service. Only category C personnel who also hold category B1, B2 / B2* or B3 qualifications may perform both roles in base maintenance. 4. The following titles shown against each category designator provide a readily understandable indication of the job function : Category A: Line maintenance certifying mechanic. Category B1: Maintenance certifying technician – mechanical. Category B2/B2*: Maintenance certifying technician – avionic. Category B3: Simple light aeroplane maintenance certifying technician. Category C: Base maintenance certifying engineer. 5. Tasks permitted by HKAR 66.20(a)(1) to be certified under the category A certification authorisation as part of minor scheduled maintenance or simple defect rectification are specified in HKAR-145 which contains a typical example list of such tasks. 6. For the purposes of category A minor scheduled line maintenance means any minor check up to but not including the A check where functional tests can be carried out by the aircrew to ensure system serviceability. In the case of an aircraft type not controlled by a maintenance programme based upon the A/B/C/D check principle, minor scheduled line maintenance means any minor check up to and including the weekly check or equivalent. 7. The category B1 and B3 licence also permits the certification of work involving avionic systems, providing the serviceability of the system can be established by a simple self- test facility, other on-board test systems/equipment or by simple ramp test equipment. Defect rectification involving test equipment which requires an element of decision making in its application – other than a simple go / no-go decision – cannot be certified. 8. The category B2/B2* will need to be qualified as category A in order to carry out simple mechanical tasks and be able to make certifications for such work. SECTION 3 HKAR-66 5 July 2024 3-4 ISSUE 3 Revision 4 GM 66.20(b)2 Privileges The sentence ‘met the provision for the issue of the appropriate privileges’ included in HKAR 66.20(b)2 means that during the previous 2 years the person has met all the requirements for the endorsement of the corresponding aircraft rating (for example, in the case of aircraft in Group 1, theoretical plus practical element plus, if applicable, on-the-job training). This supersedes the need for 6 months of experience for the first 2 years. However, the requirement of 6 months of experience in the preceding 2 years will need to be met after the second year. GM 66.20(b)4 Privileges 1. Holders of a HKAR-66 aircraft maintenance licence may not exercise certification privileges unless they have a general knowledge of the language used within the maintenance environment including knowledge of common aeronautical terms in the language. The level of knowledge should be such that the licence holder is able to: - read and understand the instructions and technical manuals used for the performance of maintenance; - make written technical entries and any maintenance documentation entries, which can be understood by those with whom they are normally required to communica