PC-12 Service Bulletin Number 55-004

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Service Bulletin No: 55-004 Date: Mar 29/19 Rev. No. Date: Page 1 of 8 Service Bulletin No: 55-004 Ref No: 390 Modification No: - ATA Chapter: 55 SERVICE BULLETIN PILATUS AIRCRAFT LTD, STANS, SWITZERLAND STABILIZERS - HORIZONTAL STABILIZER - CHECK OF THE REAR ATTACHMENT BOLTS 1. Planning Information A. Effectivity All PC-12 horizontal stabilizer rear attachment bolts P/N 555.10.12.139 with production order number (FAUF) FAUF 10169753, FAUF 10171067 or FAUF 10171267 installed on PC-12, PC- 12/45, PC-12/47 and PC-12/47E Series aircraft and/or held as spares. The horizontal stabilizer rear attachment bolts with the above listed P/N and FAUF were installed on new production PC-12/47E with aircraft MSN 1821 thru 1848 or were delivered as spares. This Service Bulletin has been incorporated during production on MSN 1849 and Up. All PC-12, PC-12/45, PC-12/47 and PC-12/47E Series aircraft which have replaced the horizontal stabilizer rear attachment bolts P/N 555.10.12.139 between July 24, 2018 and the issue date of this Service Bulletin may also be affected by the use of spares. B. Concurrent Requirements None. C. Reason (1) Issue Horizontal stabilizer rear attachment bolts P/N 555.10.12.139 with FAUF 10169753, FAUF 10171067 or FAUF 10171267 without the correct heat treatment have reduced material properties, which can possibly result in fatigue failure. (2) Cause The component manufacturer identified the incorrect heat treatment after delivery of the above listed P/N and FAUF to Pilatus Aircraft Ltd. A small number of affected bolts were used for new production aircraft and were supplied to operators as spares during a limited time period. (3) Solution At the 12 Months Inspection interval, do a check of the part number and production order number of the rear attachment bolts for the horizontal stabilizer. Replace the bolts if necessary. D. Description This Service Bulletin gives the data and instructions to do a check of the rear attachment bolts for the horizontal stabilizer and to replace defective bolts if necessary. Service Bulletin No: 55-004 Date: Mar 29/19 Rev. No. Date: Page 2 of 8 SERVICE BULLETIN E. Compliance Mandatory. To be incorporated not later than 1350 flying hours or 13 months, whichever comes first after the issue date of this Service Bulletin. Rear attachment bolts held as spares shall be checked before the installation on an aircraft or within 13 months, whichever comes first after the issue date of this Service Bulletin. F. Approval The technical content of this document is approved under the authority of DOA No. EASA. 21J. 357. PILATUS advises Operators/Owners to check with their designated Airworthiness Authority for any changes, local regulations or sanctions that may affect the embodiment of this Service Bulletin. G. Copyright and Legal Statement © Pilatus Aircraft Ltd. This document contains proprietary information that is protected by copyright. All rights are reserved. No part of this document may be copied, reproduced or translated to other languages without the prior written consent of Pilatus Aircraft Ltd. In connection with the use of this document, Pilatus does not provide any express or implied warranties and expressly disclaims any warranty of merchantability or fitness for a particular purpose. This document contains trade secrets, confidential and/or proprietary information of Pilatus and technical data subject to export control laws and regulations, including the U.S. Export Administration Regulations (EAR). Disclosure or distribution of this document contrary to the EAR, and other laws and regulations, is strictly forbidden. The above restrictions may apply to data on all pages of this document. H. Manpower Task During 12 Months Inspection Interval Check Replacement Preparation 0 0.2 Check 0 - Replacement - 1.1 Close Up 0 0.2 TOTAL MAN-HOURS 0 1.5 I. Weight and Balance No change. J. Electrical Load Data No change. Service Bulletin No: 55-004 Date: Mar 29/19 Rev No. Date: Page 3 of 8 SERVICE BULLETIN K. Software No change. L. References Aircraft Maintenance Manual (AMM): NOTE: AMM references are given without the model prefix. For PC-12, PC-12/45, PC-12/47 Series aircraft use the prefix 12-A, for PC-12/47E Series aircraft use the prefix 12-B. 06-20-00-00A-040A-A 24-00-00-00A-901A-A 27-40-00-00A-903A-A 30-10-00-00A-903A-A 30-10-00-00A-903B-A 55-10-01-00A-920A-A M. Publications Affected Not applicable. N. Interchangeability of Parts Not applicable. Service Bulletin No: 55-004 Date: Mar 29/19 Rev. No. Date: Page 4 of 8 SERVICE BULLETIN 2. Material Information A. Material - Price and Availability Operators that require additional information and/or Service Bulletin Material should  contact their authorized Pilatus Service Center, or Pilatus Customer Support on  www.pilatus-aircraft.com  contact us NOTE: Part Numbers given in this Service Bulletin are correct at the time of approval. Pilatus Aircraft Ltd. reserves the right to change part numbers as necessary. Part numbers of items delivered are correct when dispatched. This could lead to differences between those part numbers quoted in this Service Bulletin and if parts are superseded. Operators are requested to check the IPD for delivered parts which differ from those listed in the Service Bulletin Materials List. Operators are requested to advise Pilatus Aircraft Ltd of the Manufacturer’s Serial Number of aircraft which are affected by this Service Bulletin. B. Warranty Credit will be issued for parts and labor for all affected aircraft on approval of a warranty claim, provided: • The work is accomplished during the next 12 Months Inspection by an authorized Service Center within 13 months from the issue date of this Service Bulletin. • The affected bolts and the feedback sheet have been returned to Pilatus Aircraft Ltd. C. Material Necessary No modification kit is required. (1) Material to be Procured