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CUSTOMER SERVICES DIRECTORATE 2 ROND POINT EMILE DEWOITINE 31700 BLAGNAC FRANCE TELEPHONE + 33 (0)5 61 93 33 33
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 1 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 52 – Inspection of the Main Deck Cargo Door (MDCD) Actuator Bearing Fittings AIRCRAFT TYPE: A300, A300-600, A310 OUR REF.: A52W016-24 Rev 01 dated 01-JUL-2024 OUR PREVIOUS REF.: A52W016-24 Rev 00 dated 18-MAR-2024 EFFECTIVITY DATE: 25-March-2024
0. REASON FOR REVISION AOT A52W016-24 Rev 00 was originally issued to introduce repetitive inspections in the MDCD bearing fitting area.
AOT A52W016-24 Rev 01:
- Clarification introduced regarding the 70deg operational limitation of the MDCD opening for A/C having more than 13000 FC
- Man-hours (M/H) estimation to replace the MDCD bearing fittings has been updated The revised paragraphs are indicated between ***BEG. REV*** and ***END REV***
1. AIRCRAFT AFFECTED All A300, A300-600 and A310 Aircraft (A/C) in serial freighter configuration or converted from Pax-to- Freighter via AIRBUS Supplemental Type Certificate (STC).
A/C Models: A300 C4-203, A300 F4-203, A300 C4-620, A300 F4-605R, A300 F4-622R and A300 C4- 605R variant F.
AIRBUS STC for Pax-to-Freighter conversion: EASA STC No. 10013960 Rev. 5, EASA STC 10014779 Rev. 1 and EASA STC 10013945 Rev. 4.
2. REFERENCED DOCUMENTATION
2.1 APPENDIX Appendix 1: AOT instructions flowchart Appendix 2: AOT embodiment reporting form
2.2 REFERENCES Ref.[1] A300-600 Freighter SRM 52-36-00-001 item 270 and 275 Ref.[2] AMM or AMM Supplement 52-36-00 PB 201 MDCD - Maintenance Practices Ref.[3] AMM or AMM Supplement 52-36-00 PB 1 MDCD - Description and operations Ref.[4] NTM 51-70-00 Ref.[5] TD/81322793/008/2024 - AMM adaptation for MDCD removal Ref.[6] TD/81322793/003/2023 - Instruction for replacement of MDCD actuator bearing fittings Ref.[7] Technical Follow-Up (TFU) 52.36.00007 Ref.[8] OIT 999.0018/16 – ATA 00 – PROCEDURE TO REPORT RESULTS OF INSPECTION
SERVICE BULLETINS AND ALERT OPERATORS TRANSMISSIONS
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 2 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
3. REASON
3.1 FACTS One A300-600 operator reported to Airbus 3 cases of Main Deck Cargo Door (MDCD) Actuator Bearing Fittings (P/Ns A52371123204 and A52371123205 - Ref.[1]) found cracked during C-Check. In one of the cases, only one bearing fitting was found cracked. In the two other cases, both bearing fittings were found cracked. See Figure 1 for MDCD Actuator Bearing Fittings location and Figure 2 for crack location.
Figure 1: MDCD Actuator Bearing Fittings location Figure 2: MDCD Actuator Bearing Fittings crack location
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 3 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
3.2 ROOT CAUSE A fractographic analysis of the failed MDCD Actuator Bearing Fittings revealed that the root cause of the failure was fatigue. This has been further confirmed by a Finite Element Model (FEM) analysis.
3.3 CONSEQUENCES In case of failure of one and/or two MDCD Actuator Bearing Fittings, there is no safety impact in flight when the Cargo Door is fully closed, latched and locked.
However, in case both MDCD Actuator bearing fittings are cracked, there is a risk of MDCD undamped free fall during MDCD operations or during cargo loading/off-loading, with the MDCD in the open position.
4. OBJECTIVES OF THIS AOT The objective of this AOT is to request repetitive inspections of both MDCD Actuator Bearing Fittings as per the compliance time and inspection interval stated in paragraph 5.1.
***BEG. REV*** AOT inspections and cargo operations are limited to 70 degrees normal opening and closing procedure of the MDCD as per Ref.[2] and Ref.[3] (wind speed less than 40 knots).
***END REV*** This AOT reminds operators that the warnings and cautions from the AMM Ref.[2] shall be strictly obeyed.
5. MAINTENANCE PROCEDURE NOTE: This AOT is classified mandatory or expected to be classified mandatory by an Airworthiness Directive (AD). If the instructions of this AOT are marked as Required for Compliance (RC), the operator must follow the instructions as indicated. These instructions are introduced by “in accordance with”.
NOTE: The instructions of this AOT include procedures given in other documents or in other sections of the AOT. If the instructions of this AOT are NOT marked as Required for Compliance (RC), the operator can use an alternative procedure accepted by his/her local authority. These instructions are introduced by “refer to”.
NOTE: When this AOT gives the access or close-up instructions with no return to service tests, the operator can adapt these instructions to add flexibility to the maintenance operations. The technical intent of this AOT must comply with the set parameters.
5.1 PLANNING - RC The accomplishment of the Detailed Visual Inspection (DET), described in Paragraph 5.4 must be done no later than 330 FC from AOT effective date for A/C having accumulated more than 13000 Flight Cycles (FC), counted from (whichever occurs last):
The Entry Into Service (EIS) for serial freighter A/C, The MDCD installation for Pax-to-Freighter conversion A/C, The replacement date of both MDCD bearing fittings.
The accomplishment of the DET, described in Paragraph 5.4 must be repeated every 640 FC.
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 4 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT ***BEG. REV*** Cargo operations are limited to 70 degrees normal opening and closing procedure of the MDCD as per Ref.[2] and Ref.[3] (wind speed less than 40 knots) since AOT effective date for A/C above 13000 FC.
This is no longer needed if the MDCD bearing fittings have been replaced (as per paragraph 5.5).
This limitation is applicable at every MDCD operation for A/C above 13000 FC, not only for the inspection.
***END REV***
5.2 MANPOWER
1. The DET described in paragraph 5.4, including access, is estimated to take 0.5 man-hours (M/H) ***BEG. REV***
2. The MDCD Actuator bearing fittings replacement, including MDCD removal/installation, is estimated to take 500 man-hours (M/H) ***END REV***
5.3 ACCESS Open the MDCD as per AMM Ref.[3] to gain access to the bearing fittings.
WARNING: WHEN THE MDCD IS OPENED BUT CARGO IS NOT TO BE LOADED, SECURE FUSELAGE OPENING WITH THE MDCD NET.
***BEG. REV*** WARNING: MAXIMUM MDCD OPENING ANGLE MUST BE LIMITED TO 70 DEGREES NORMAL OPENING AND CLOSING PROCEDURE OF THE MDCD AS PER REF.[2] AND REF.[3] FOR A/C ABOVE 13000 FC.
***END REV*** WARNING: IN CASE OF NEED FOR MDCD OPENING AT 145 DEGREES (WIND SPEED LESS THAN 10 KNOTS) MONITOR THE NUMBER OF SEQUENCES AND REPORT TO AIRBUS.
WARNING: THE MAIN DECK CARGO DOOR MUST NOT BE OPERATED WHEN THE WIND SPEED IS EQUAL OR GREATER THAT 74 KM/H (40 KTS).
After accomplishment of the DET described in paragraph 5.4 and corrective actions described in paragraph 5.5, close the MDCD as per AMM Ref.[3].
5.4 INSPECTION – (RC)
1. Clean the inspection area, refer to CML 14SBA1 (lint free cotton) and with a non-aqueous cleaner, refer to CML 08BAA9 (non-aqueous cleaner – general). See Figures 3, 4 and 5 for the area to be inspected.
2. Do DET as per Ref.[4] on both MDCD bearing fittings.
NOTE: You can use a MIRROR-INSPECTION and a FLASHLIGHT-HIGHPOWER.
AIRBUS
ALERT OPERATORS TRANSMISSION - AOT
• 30 STGR13 Area to be inspected 40 8 Main Frames Figure 3: Area to be inspected - General view Areas to be inspected Auxiliary Frame C24 / Bearing Fitting Auxiliary Frame C23 / Bearing Fitting Main Frame C24 LONGN 4 STGR12 FR23 Main Frame C23 Figure 4: Area to be inspected - Detailed view I AOT ref: A52W016-24 Rev 01 Page 5 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_V8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 6 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Figure 5: Main Deck Cargo Door Actuation Mechanism – Detailed view II
5.5 FINDINGS - (RC) ***BEG. REV*** In case of no finding, inspection must be repeated as defined in paragraph 5.1 with limited MDCD opening angle to 70 degrees normal opening and closing procedure as per Ref.[2] and Ref.[3] (wind speed less than 40 knots).
***END REV*** In case of one or two MDCD bearing fitting(s) found cracked, both must be replaced before next flight by new ones (same P/N) as per instructions given in Ref.[5] and Ref.[6].
5.6 SPARES AND TOOLING In case the MDCD bearing fittings need to be replaced, the Part Numbers (P/N) to be ordered are the following ones:
- P/N A523-71123-002-00 FWD Bearing Fitting Assy (FR23)
- P/N A523-71123-003-00 Rear Bearing Fitting Assy (FR24)
6. ADDITIONAL INFORMATION
6.1 FOLLOW-UP PLAN It is anticipated that this AOT will be rendered mandatory by issuance of an EASA Airworthiness Directive (AD).
Follow-up of this AOT will be ensured by means of Technical Follow-Up (TFU) Ref.[7].
Inspection Service Bulletins (ISB) will be issued to supersede this AOT.
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 7 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT
6.2 IMPACTED DOCUMENTATION Not applicable.
7. AOT APPROVAL The technical content of this document is approved under the authority of the DOA ref.EASA.21J.031.
8. REPORTING Address your inspection results (with or without findings) to AIRBUS Customer Services through the generic e-mail address. Refer to the latest reporting policy (OIT 999.0018/16 Ref.[8]).
Give the AOT reference in the mail title, as follows: A52W016-24 Inspection Result.
You can address your questions about this AOT to AIRBUS Customer Services through TechRequest on AIRBUS World, selecting Maintenance & Engineering Domain, Engineering Support Section and ATA 52-36.
Best Regards, Ahmed CHABBOUH
SENIOR DIRECTOR IN-SERVICE
ENGINEERING
CUSTOMER CARE CENTER Pascal VIALLETON HEAD OF A300/A310 PROGRAMME AND CHIEF
ENGINEER
CUSTOMER SERVICES
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 8 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT APPENDIX 1 – Instructions flowchart From the AOT effective date* and within the threshold given in paragraph 5.1, do the inspections as detailed in paragraph 5.4 Is there any crack or damage(s) found?
Replace both MDCD bearing fittings as per TD/81322793/003/2023 and TD/81322793/008/2024 Restore A/C conditions and close accesses* Report to AIRBUS using Appendix 2 Yes No Repeat inspection as per interval indicated in paragraph 5.1 ***BEG. REV*** The operation of the MDCD opening must be limited to 70 degrees normal opening and closing procedure as per Ref.[2] and Ref.[3] for A/C above 13000 FC.
***END REV***
ALERT OPERATORS TRANSMISSION - AOT AOT ref: A52W016-24 Rev 01 Page 9 of 9 Date: 01-JUL-2024 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2024. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT APPENDIX 2 – AOT embodiment reporting form A/C INFORMATION:
OPERATOR:
A/C MSN:
A/C REGISTRATION:
FLIGHT CYCLES:
DATE OF INSPECTION:
INSPECTION RESULTS:
Finding at FWD MDCD Bearing Fitting (Yes / No) Finding at Rear MDCD Bearing Fitting (Yes / No) COMMENTS (free text):