S.B. N°139-783 EMERGENCY ALERT

LEONARDO AW139 · Service Bulletins

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Overview

This document is a Service Bulletin for the Leonardo AW139 helicopter, specifically addressing the inspection of main landing gear shock absorbers. It outlines compliance requirements, inspection procedures, and necessary actions based on the number of landings of the shock absorber assemblies.

Service Bulletin N° 139-783 issued on April 10, 2024.
Focuses on the inspection of main shock absorber assemblies.
Inspection frequency is based on the number of landings.
Ultrasonic Testing (UT) is required for inspections.
Compliance time for inspections has been reduced.
No action needed for assemblies compliant with previous bulletin.
Replacement of shock absorbers is required if cracks are found.
Technical content approved under EASA authority.

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Source

Originally published by regulations.gov. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.

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Document details

Type: Service Bulletins
Year: 2024
File size: 5.3 MB
Publisher: regulations.gov
Language: en

Specifications & performance

Extracted from this document.

Specifications

Vendor part numbers: 1654B0000-01, 1654C0000-01
Main shock absorber part numbers: 3G3210V00333, 3G3210V01031

About this document

What is the S.B. N°139-783 EMERGENCY ALERT?

The S.B. N°139-783 EMERGENCY ALERT is a service bulletins for the LEONARDO AW139, dated 2024.

Where does the S.B. N°139-783 EMERGENCY ALERT come from?

This copy of the S.B. N°139-783 EMERGENCY ALERT was originally published by regulations.gov and is hosted on Sprinkle as a free, searchable reference copy.

What year was the S.B. N°139-783 EMERGENCY ALERT published?

The S.B. N°139-783 EMERGENCY ALERT — the LEONARDO AW139 service bulletins on file — is dated 2024.

Documentation completeness

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In this document

Planning Information

Details the effectivity of the Service Bulletin and compliance requirements for shock absorber assemblies based on their landing counts.

Compliance

Outlines specific inspection timelines based on the number of landings for installed and spare shock absorber assemblies.

Reason

Addresses incidents of broken shock absorber piston rods and the need for inspections to detect potential cracks.

Description

Provides instructions for performing a Special Detailed Inspection using Ultrasonic Testing to check for cracks in the shock absorber assemblies.

Manpower

Estimates the maintenance man hours required for inspection and potential replacement of shock absorbers.

Required Materials

Lists parts and special tools necessary for the inspection and replacement of shock absorbers.

Safety notes

Inspection must be performed by qualified personnel.
If landings are unknown, calculate using flight hours multiplied by a factor of 6.
Replacement does not terminate the need for future inspections.
Compliance with EASA directives is mandatory.

Full document text

Page 1 of 32 N° 139-783 DATE: April 10, 2024 REV. : A - November 6, 2024 TITLE ATA 32 – MLG SHOCK ABSORBER INSPECTION REVISION LOG Revision A is issued in order to change the compliance time of this Service Bulletin, reducing the minimum number of landings from which the inspection must be performed. Also, the landings values defined in paragraphs 1.B.2 and 1.B.3, requiring a lower compliance time, are reduced. All the rest of the Service Bulletin is unchanged. For shock absorber assemblies already compliant with the previous issue of this Service Bulletin, no additional action is needed and the existing planning for the next repetitive inspection can be maintained (every 2000 landings or 12 months, whichever occurs first). For shock absorber assemblies NOT already compliant with the previous issue of this Service Bulletin but for which the first inspection was already planned, the new lower compliance time for first inspection should be checked and the planning should be revised accordingly. Revision bars identify changes. Leonardo S.p.A. Via Giovanni Agusta, 520 21017 Cascina Costa di Samarate (VA) Italy Tel.: +39 0331 229111 - Fax: +39 0331 229605/222595 An appropriate entry should be made in the aircraft log book upon accomplishment. If ownership of aircraft has changed, please, forward to new owner. EMERGENCY ALERT SERVICE BULLETIN S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 2 of 32 REVISION: A - November 6, 2024 1. PLANNING INFORMATION A. EFFECTIVITY All main shock absorber assemblies (SA) P/N 3G3210V00333 or P/N 3G3210V01031 (vendor P/N 1654B0000-01 or P/N 1654C0000-01 respectively) installed on AW139 helicopters or kept in stock. B. COMPLIANCE NOTE The Ultrasonic Testing (UT) inspection must be performed by personnel qualified in accordance with the non-destructive testing requirements of EN4179/NAS410 for Level II or higher, or of an equivalent standard recognized by the competent authority. NOTE If the number of landings of a main shock absorber assembly is not known, it shall be calculated multiplying the SA FH by a factor of 6. 1. For installed SA with less than 4000 landings, within and not later than 100 FH after reaching 4000 landings and then every 2000 landings or 12 months, whichever occurs first, after previous inspection. 2. For installed SA with a number of landings from 4000 to 5999, within and not later than 100 FH after the issue of this Service Bulletin and then every 2000 landings or 12 months, whichever occurs first, after previous inspection. 3. For installed SA with a number of landings from 6000 to 6999, within and not later than 50 FH after the issue of this Service Bulletin and then every 2000 landings or 12 months, whichever occurs first, after previous inspection. 4. For installed SA with 7000 landings or more: a. If NOT previously inspected in accordance with Rev. / of this SB, within and not later than 10 FH after the issue of this Service Bulletin b. If already inspected in accordance with Rev. / of this SB, within and not later than 2000 landings or 12 months, whichever occurs first, after previous inspection and then every 2000 landings or 12 months, whichever occurs first, after previous inspection. S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 3 of 32 5. For spare SA which have accumulated 4000 landings or more and already inspected since less than 12 months in accordance with this SB or LLI SB 1652C-32-03 in Annex A, every 2000 landings or 12 months, whichever occurs first, after previous inspection once installed. 6. For spare SA which have accumulated 4000 landings or more and already inspected since more than 12 months in accordance with this SB or LLI SB 1652C-32-03 in Annex A, before next installation and then every 2000 landings or 12 months, whichever occurs first, after previous inspection once installed. 7. For spare SA which have accumulated 4000 landings or more and NOT already inspected in accordance with this SB or LLI SB 1652C-32-03 in Annex A, before next installation and then every 2000 landings or 12 months, whichever occurs first, after previous inspection once installed. 8. For spare SA which have accumulated less than 4000 landings, in accordance with paragraph 1.B.1 once installed, even if already inspected in accordance with this SB or LLI SB 1652C-32-03 in Annex A. C. CONCURRENT REQUIREMENTS N.A. D. REASON Following two occurrences of broken eye end of the Main Shock Absorber piston rod reported in service, an investigation was performed in cooperation with Liebherr- Aerospace Lindenberg (LLI) supplier of the mentioned SA. LLI Service Bulletin 1652C- 32-03 has been issued (see Annex A), requiring the inspection of the eye end of the SA by means of a Special Detailed Inspection using Ultrasonic Testing to detect potential cracks. Leonardo Helicopters has developed this Service Bulletin to manage the application of such inspection requirements for the SA currently installed on AW139 fleet and to prescribe their replacement in case of findings following the inspection. E. DESCRIPTION This Service Bulletin provides all the necessary instructions on how to perform a repetitive Special Detailed Inspection of main shock absorber assemblies P/N 3G3210V00333 or P/N 3G3210V01031 (vendor P/N 1654B0000-01 or P/N 1654C0000-01 respectively), as prescribed by LLI Service Bulletin 1652C-32-03. The inspection is performed using the UT technique and focusing on the SA piston rod eye end to detect cracks development in two specific areas (refer to Figure 2 of LLI SB 1652C-32-03 in Annex A). In case of findings, it is needed to replace the SA with S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 4 of 32 REVISION: A - November 6, 2024 another unit. Replacing of the SA does not constitute a terminating action for the inspections required under paragraph B. COMPLIANCE. F. APPROVAL The technical content of this Service Bulletin is approved under the authority of DOA

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nr. EASA.21.J.005. For helicopters registered under other Aviation Authorities, before applying the Service Bulletin, applicable Aviation Authority approval must be checked within Leonardo Helicopters customer portal. EASA states mandatory compliance with inspections, modifications or technical directives and related time of compliance by means of relevant Airworthiness Directives. If an aircraft listed in the effectivity embodies a modification or repair not LH certified and affecting the content of this Service Bulletin, it is responsibility of the Owner/Operator to obtain a formal approval by Aviation Authority having jurisdiction on the aircraft, for any adaptation necessary before incorporation of the present Service Bulletin. G. MANPOWER To comply with this Service Bulletin, the following MMH are deemed necessary: • approximately one (1) if only the inspection is performed; • approximately twenty (20) if also the SA replacement is needed. MMH are based on hands-on time and can change with helicopter configuration, personnel and facilities available. MMH are not comprehensive of the overall hours necessary to get access to work areas and to remove all the equipment that interferes with the application of the prescribed instructions. H. WEIGHT AND BALANCE N.A. I. REFERENCES I.1 PUBLICATIONS Following Data Modules refer to AMP: DATA MODULE DESCRIPTION PART DM01 39-A-00-20-00-00A-120A-A Helicopter on ground for a safe maintenance. - DM02 39-A-07-11-00-00A-028A-A Helicopter - Lift on jacks - General - DM03 39-A-32-11-01-02A-920A-B Main shock absorber (left main landing gear) - Replacement - S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 5 of 32 DATA MODULE DESCRIPTION PART DM04 39-A-32-12-01-02A-920A-B Main shock absorber (right main landing gear) - Replacement - I.2 ACRONYMS & ABBREVIATIONS AMDI Aircraft Material Data Information AMP Aircraft Maintenance Publication CB Circuit Breaker DM Data Module DOA Design Organization Approval EASA European Union Aviation Safety Agency FH Flight Hours IPD Illustrated Parts Data Publication ITEP Illustrated Tools and Equipment Publication LH Leonardo Helicopters LLI Liebherr-Aerospace Lindenberg MMH Maintenance Man Hours MLG Main Landing Gear N.A. Not Applicable P/N Part Number SA Main Shock Absorber SB Service Bulletin SDI Special Detailed Inspection S/N Serial Number UT Ultrasonic Testing WRM Warranty Reply Memo I.3 ANNEX Annex A LLI SB 1652C-32-03 “Inspection of shock absorber piston rod eye end” J. PUBLICATIONS AFFECTED N.A. K. SOFTWARE ACCOMPLISHMENT SUMMARY N.A. S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 6 of 32 REVISION: A - November 6, 2024 2. MATERIAL INFORMATION A. REQUIRED MATERIALS A.1 PARTS NOTE Following parts are needed only if SA replacement is deemed necessary after the inspection and will be supplied only if the required documentation is provided, as detailed in the industry support information section. # P/N ALTERNATIVE P/N DESCRIPTION Q.TY LVL NOTE LOG P/N 1 3G3210V00333 or 3G3210V01031 Main shock absorber assy 1 . (1) - Refer also to IPD for the spares materials required to comply with the AMP DMs referenced in the accomplishment instructions. A.2 CONSUMABLES Refer to the “MATERIAL INFORMATION” section of Liebherr SB 1652C-32-03 in Annex A for the consumable materials required to comply with this Service Bulletin. Refer also to AMDI for the consumable materials required to comply with the AMP DMs referenced in the accomplishment instructions. A.3 LOGISTIC MATRIX N.A. NOTES (1) The P/N to be ordered is the same as the one inspected and to be replaced. B. SPECIAL TOOLS The following special tools, or equivalent, are necessary to accomplish this Service Bulletin: # P/N DESCRIPTION Q.TY NOTE PART 2 Commercial Light source 1 (B1) - 3 Commercial Mirror 1 (B1) - 4 Commercial UT portable flaw detector equipment 1 (B1) (B2) - 5 Commercial Cable with microdot connector 1 (B1) (B3) - 6 1654A0100-01W02 Reference specimen 1 (B4) - 7 uTA45-5-S0024 or UTA 4X4,5 45-5 P Wedge and probe 1 (B4) (B5) - Refer also to ITEP for the special tools required to comply with the AMP DM referenced in the accomplishment instructions. S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 7 of 32 SPECIAL TOOLS NOTES Item to be procured as local supply. Any UT portable flaw detector equipment is fit for purpose with conventional UT. Refer also to the designated NDT inspector for details and availability of the item. This item should be suitable for connecting the probe, provided with microdot connector, to the available UT portable flaw detector equipment. Refer also to the designated NDT inspector for details and availability of the item. Item to be procured through LH. Please contact Leonardo Helicopters Division order administration to request the tool supply on a free of charge basis. For details, see the industry support information section below. Probe and wedge are bonded together in a single P/N, so not separated. The probe is equipped with microdot connector. C. INDUSTRY SUPPORT INFORMATION Owners/Operators who comply with the instructions of this Service Bulletin no later than the applicable date in the “Compliance” section will be eligible to receive required materials and special tools on free of charge basis, except for Consumable Materials. Only in case SA replacement is needed because of findings following the UT inspection, please issue relevant MMIR form to your Warranty Administration Dpt. including the NDT Inspection Report in Figure 1 signed and stamped, evidence of the number of the landings of the inspected SA (e.g. SA or MLG log card), if available, and photo of the inspected SA showing corresponding S/N with such evidence. If one of the requested document/information is not provided, MMIR will be rejected. With reference to special tools note (B4), the MMIR form must NOT be issued to procure the special tools, because these will be provided on a free of charge basis. Please place a free of charge PO related to Wedge (P/N uTA45-5-S0024 or UTA 4X4,5 45-5 P) and Specimen (P/N 1654A0100-01W02) to be shared directly to your Order Administrator. NOTE: WRM will include RETURN MATERIAL AUTHORIZATION (RMA) number; the SA P/N 3G3210V00333 or P/N 3G3210V01031 has to be returned to LHD within thirty (30) calendar days after the shipment of the replacement part. In case of missing return within thirty (30) calendar days, Customer will be invoiced for the price of the replacement SA. NOTE: Customers who fail to comply with the instructions in this Service Bulletin before the compliance date are not eligible for the aforementioned special policy. S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 8 of 32 REVISION: A - November 6, 2024 3. ACCOMPLISHMENT INSTRUCTIONS GENERAL NOTES Place an identification tag on all components that are re- usable, including the attaching hardware that has been removed to gain access to the modification area and adequately protect them until their later re-use. NOTE Skip steps 1, 2 and 8 for SA kept in stock. 1. In accordance with AMP DM 39-A-00-20-00-00A-120A-A, prepare the helicopter on ground for a safe maintenance. Disconnect the battery, all electrical power sources and/or the external power supply. 2. In accordance with the applicable steps of AMP DM 39-A-07-11-00-00A-028A-A, lift the helicopter on jacks. NOTE The following Ultrasonic Testing (UT) inspection must be performed by personnel qualified in accordance with the non-destructive testing requirements of EN4179/NAS410 for Level II or higher, or of an equivalent standard recognized by the competent authority. NOTE To better clarify the inspection procedure and the expected results, also refer to the video tutorial available, for reference only, on Leonardo Customer Portal (https://leonardo.canto.global/b/VQ2MN). 3. In accordance with LLI SB 1652C-32-03 in Annex A, paragraph 3.C PROCEDURE steps from (1) through (4) included, inspect the SA piston rod eye end. 4. With reference to Table 4 of LLI SB 1652C-32-03 in Annex A, record the outcome of the inspection in the Inspection Report in Figure 1 and fill it out with every other required information. Send it thru technical query on Leonardo WebPortal or to Product Support Engineering (engineering.support.lhd@leonardo.com, and for North, Central and South America also to AWPC.Engineering.Support@leonardocompany.us). S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 9 of 32 NOTE SA kept in stock that are classified as not serviceable must be returned to LH and replaced with another unit. In that case skip to step 7. 5. If the inspected SA has been classified as not serviceable, perform following step 6 to replace it. Otherwise skip to step 7 and plan the next inspection in accordance with the applicable compliance time, as specified in paragraph B. COMPLIANCE. 6. In accordance with AMP DM 39-A-32-11-01-02A-920A-B or 39-A-32-12-01-02A-920A-B, replace the damaged SA with another unit and send the removed SA to LH. Plan the next inspection of the installed SA in accordance with the applicable compliance time, as specified in paragraph B. COMPLIANCE. NOTE Recording of accomplishment via EASA Form 1, as reported in LLI SB in Annex A (ref step 3.D CORRECTIVE ACTION), is only applicable to activities performed by LLI in its service centers. NOTE If the number of landings of the SA is not known, it shall be calculated multiplying its FH by a factor of 6. 7. Record for compliance with this Service Bulletin on SA log card and on MLG log card. 8. Return the helicopter to flight configuration and record for compliance with this Service Bulletin on the helicopter logbook. 9. Gain access to My Communications section on Leonardo WebPortal and compile the “Service Bulletin Application Communication”. As an alternative, send the attached compliance form to the following mail box: engineering.support.lhd@leonardo.com and (for North, Central and South America) also to: AWPC.Engineering.Support@leonardocompany.us  Non cancellare mai questo segnalibro Non cancellare mai interruzione sezione→ Figure 1 S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 10 of 32 REVISION: A - November 6, 2024 SB 139-783 Rev. A – Inspection Report Date Location Helicopter S/N FH Landings MLG LH RH P/N S/N FH Landings ☐ ☐ SA P/N S/N FH Landings Inspection results (refer to Table 4 of LLI SB 1652C-32-03 in Annex A) Upper inspection area No findings (<40%) ☐ Acceptable for use (40-80%) ☐ Not acceptable (>80%) ☐ Lower inspection area No findings (<40%) ☐ Acceptable for use (40-80%) ☐ Not acceptable (>80%) ☐ NDT technician details Name Company/Service centre name Signature Notes: ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 11 of 32 ANNEX A LLI SB 1652C-32-03 INSPECTION OF SHOCK ABSORBER PISTON ROD EYE END ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 12 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 13 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 14 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 15 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 16 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 17 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 18 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 19 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 20 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 21 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 22 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 23 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 24 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 25 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 26 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 27 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 28 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 29 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 30 of 32 REVISION: A - November 6, 2024 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 REVISION: A - November 6, 2024 Page 31 of 32 ANNEX A S.B. N°139-783 EMERGENCY ALERT DATE: April 10, 2024 Page 32 of 32 REVISION: A - November 6, 2024 Remarks: Information: SERVICE BULLETIN COMPLIANCE FORM Date: Number: Revision: Please send to the following address: Telephone: Fax: B.T. Compliance Date: Customer Name and Address: Helicopter Model S/N Total Number Total Hours T.S.O. LEONARDO S.p.A. CUSTOMER SUPPORT & SERVICES - ITALY PRODUCT SUPPORT ENGINEERING & LICENSES DEPT. Via Giovanni Agusta, 520 21017 Cascina Costa di Samarate (VA) - ITALY Tel.: +39 0331 225036 Fax: +39 0331 225988 We request your cooperation in filling this form, in order to keep out statistical data relevant to aircraft configuration up-to-date. The form should be filled in all its parts and sent to the above address or you can communicate the application also via Technical Bulletin Application Communication Section placed in Leonardo AW Customer Portal - MyCommunications Area. We thank you beforehand for the information given.

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