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A maintenance supervisor reports their new aerospatiale/eurocopter AS350 aircraft maintenance manuals (amm) do not have a clear maintenance illustration reference to help determine the correct orientation of a beveled washer during build-up of the aft flex coupling; compared to the old manuals for the main rotor drive system (mrds).
| Attributes | |
| ACN | 1005948 |
| Time | |
| Date | 201204 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Eurocopter AS 350/355/EC130 - Astar/Twinstar/Ecureuil |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Main Rotor |
| Person 1 | |
| Function | Other / Unknown |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
During the build-up of the aft flex coupling on the main rotor drive system (mrds); there was some question on what the correct orientation of the beveled washer. Reference aerospatiale AS350 eurocopter aircraft maintenance manual (amm) 63-11-00; paragraph 4-2. The maintenance note states: 'note: the face of the washers that makes a curve must point to the flexible coupling'. The curved face of the washer is easily mistaken for the flat side. Previous revisions of the amm showed a very clear illustration that helped avoid this confusion. It would help if it was reinstated to the newer manuals.
Original NASA ASRS Text
Title: A Maintenance Supervisor reports their new Aerospatiale/Eurocopter AS350 Aircraft Maintenance Manuals (AMM) do not have a clear Maintenance illustration reference to help determine the correct orientation of a beveled washer during build-up of the Aft Flex coupling; compared to the old manuals for the Main Rotor Drive System (MRDS).
Narrative: During the build-up of the Aft Flex coupling on the Main Rotor Drive System (MRDS); there was some question on what the correct orientation of the beveled washer. Reference Aerospatiale AS350 Eurocopter Aircraft Maintenance Manual (AMM) 63-11-00; Paragraph 4-2. The Maintenance note states: 'NOTE: The face of the washers that makes a curve must point to the flexible coupling'. The curved face of the washer is easily mistaken for the flat side. Previous revisions of the AMM showed a very clear illustration that helped avoid this confusion. It would help if it was reinstated to the newer manuals.
Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.