# Airbus All Operators Transmission A32P028-22 Copy: No revision named ("AOT A32P028-22"), 4 pages: PDF https://openairdocs.org/files/sha256/da/0d/da0d97ea11b213b92a16264472c201e7fd8bc7965fad3b481c91515beb4a66a4; text https://openairdocs.org/service-documents/airbus/aot-a32p028-22/file/da0d97ea11b2.md. Rights: © Airbus S.A.S. Filed by the FAA in regulations.gov docket FAA-2023-0155, the docket of AD 2023-02-15. Not covered by OpenAirDocs’ CC0 dedication. ## Details - Manufacturer: [Airbus](https://openairdocs.org/service-documents/airbus.md) - Type: Other document (All Operators Transmission) - Number: A32P028-22 - Page: https://openairdocs.org/service-documents/airbus/aot-a32p028-22 ## Text (4 pages) Rights: © Airbus S.A.S. Filed by the FAA in regulations.gov docket FAA-2023-0155, the docket of AD 2023-02-15. Not covered by OpenAirDocs’ CC0 dedication. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 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: A32P028-22 Rev 00 Page 1 of 4 Date: 29-NOV-2022 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2022. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT SUBJECT: ATA 32 – MLG Bogie Pivot Pin Greasing Interval Reduction AIRCRAFT TYPE: A350-900 OUR REF.: A32P028-22 Rev 00 dated 29-NOV-2022 EFFECTIVITY DATE: 05-Dec-2022 1. AIRCRAFT AFFECTED All A350-900 Aircraft. 2. REFERENCED DOCUMENTATION 2.1 APPENDIX N/A 2.2 REFERENCES Reference 1: MP TASK A350-A-32-XX-XX-00001-240A-A - Lubrication of Main Landing Gear and Doors Reference 2: MPD Task 321000-00M01-01 3. REASON The purpose of this AOT is to inform all A350-900 operators of recent Main Landing Gear (MLG) Bogie Pivot Pin (BPP) in-service findings and to reduce the greasing interval at this location. 3.1 FACTS The Bogie Pivot Pin ensures the connection between the Landing Gear Slider and the Bogie Beam. This component is a Principal Structure Element (PSE) and as such is listed in the Airworthiness Limitations Section (ALS Part 1). 3.2 HISTORY/BACKGROUND Some MLG Bogie Pivot Pins have been removed in-service and inspected in laboratory. Damages were observed on the HVOF applied coating (High Velocity Oxygen Fuel). 3.3 ROOT CAUSE An investigation has been launched in order to better understand the root cause of Bogie Pivot Pin damages. The damaged components have been retrieved and are currently being investigated by Safran Landing System (SLS). In the meantime, both Airbus and SLS Engineering are looking at all parameters that could influence the HVOF coating damage. 3.4 INVESTIGATION Preliminary Laboratory analysis has shown evidence of localised overheating on areas of the HVOF coating surface of the Bogie Pivot Pin. ### Page 2 ALERT OPERATORS TRANSMISSION - AOT AOT ref: A32P028-22 Rev 00 Page 2 of 4 Date: 29-NOV-2022 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2022. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT Preliminary laboratory analysis observations highlighted signs of scored and cracking of the HVOF coating. In one case, cracks seen in the HVOF coating were also observed on the base material. 3.5 CONSEQUENCES The presence of overheated area on the HVOF coating and/or base material of the MLG Bogie Pivot Pin could lead to detrimental damage to the part. 4. OBJECTIVES OF THIS AOT This AOT is issued for all A350-900 operators to reduce the interval of the Bogie Pivot Pin lubrication at a frequency not exceeding 50FC or 4 months (whichever occurs first). An increased frequency of greasing of the Bogie Pivot Pin should improve the lubrication of the joints to reduce the possibility for an overheating event and therefore lower the risk of damage. 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) Airbus recommend greasing of the Main Landing Gear Bogie Pivot Pin is performed without exceeding 30 days from the effective date of this AOT. For the interval regime, Airbus recommend greasing the Main Landing Gear Bogie Pivot Pin at every 50FC or 4 months (whichever occurs first). Note: this AOT is applicable from aircraft first flight. 5.2 MANPOWER The estimated time to perform the greasing of the MLG Bogie Pivot Pins is 0.5 Man Hours (MH) per side. 5.3 ACCESS For the Job Set-up and Close-up, refer to A350-A-32-XX-XX-00001-240A-A. 5.4 INSPECTION – (RC) N/A ### Page 3 ALERT OPERATORS TRANSMISSION - AOT AOT ref: A32P028-22 Rev 00 Page 3 of 4 Date: 29-NOV-2022 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2022. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT 5.5 FINDINGS – (RC) N/A 5.6 INSTRUCTIONS – (RC) Within the compliance time, and at the intervals described in paragraph 5.1, do the greasing of the Main Landing Gear Bogie Pivot Pins of both RH and LH Main Landing Gears as follows: -Do the greasing at location items 34, 39, 44 & 45. Refer to A350-A-32-XX-XX-00001-240A-A (see figure 1 for greaser location). Figure 1: MLG bogie Pivot Pin Greasers location (RH MLG shown, LH MLG symmetrical) (Greaser item numbers as per A350-A-32-XX-XX-00001-240A-A) 5.7 SPARES AND TOOLING Refer to Reference 1 (Paragraph 2.2). 6. ADDITIONAL INFORMATION 6.1 FOLLOW-UP PLAN No revision of this AOT is foreseen. 6.2 IMPACTED DOCUMENTATION This AOT has no impact on the published documentation. ### Page 4 ALERT OPERATORS TRANSMISSION - AOT AOT ref: A32P028-22 Rev 00 Page 4 of 4 Date: 29-NOV-2022 C80_AOT_FM1104649_v8.0 © AIRBUS S.A.S. 2022. ALL RIGHTS RESERVED. CONFIDENTIAL AND PROPRIETARY DOCUMENT The MPD task 321000-00M01-01 (Reference 2) remains applicable for the lubrication of the complete Main Landing Gear and Doors. 7. AOT APPROVAL The technical content of this document is approved under the authority of the DOA ref.EASA.21J.031. 8. REPORTING N/A 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 32-11. Best Regards, Ahmed CHABBOUH SENIOR DIRECTOR ENGINEERING SUPPORT IN SERVICE ENGINEERING CUSTOMER CARE CENTRE Pilar ALVAREZ VICE PRESIDENT WIDE BODY PROGRAMME SUPPORT CUSTOMER SERVICES --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.