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An aircraft maintenance technician (amt) recommends an additional reference be added to airworthiness directive (ad) 2012-11-09 to include illustrated parts catalog (ipc) 35-21-01-40b; (item C). The ipc would provide a better understanding of the passenger O2 mask box release cable routing. Misunderstanding of step 2 of the ad resulted in an incorrect installation of the release cable and O2 masks on a B777-200 aircraft.
| Attributes | |
| ACN | 1272196 |
| Time | |
| Date | 201506 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Oxygen System/Pax |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance |
Narrative:
While working an engineering repair authorization ec/ea and ad 2012-11-09; step 2-b1 appears to have the mechanic inspect the existing cable; install the mask and insert [release] cable pin into the striker pin of the cylinder if no damage was found. There was a misunderstanding by the [maintenance] crew of step 2 of ad 2012-11-09; since the mechanic had to install a new cable; which is not addressed in ad 2012-11-09. As a result; the cable assembly and oxygen masks were incorrectly installed on a B777-200 aircraft during reactivation of the oxygen system.additional reference should include an illustrated parts catalog (ipc) 35-21-01-40b (item C) for a better understanding of [release] cable routing. Also add a [maintenance] step to install any missing cable to [passenger O2] box; including hardware; into the engineering kit for ad 2012-11-09 and better training.
Original NASA ASRS Text
Title: An Aircraft Maintenance Technician (AMT) recommends an additional reference be added to Airworthiness Directive (AD) 2012-11-09 to include Illustrated Parts Catalog (IPC) 35-21-01-40b; (item C). The IPC would provide a better understanding of the Passenger O2 mask box release cable routing. Misunderstanding of Step 2 of the AD resulted in an incorrect installation of the release cable and O2 masks on a B777-200 aircraft.
Narrative: While working an Engineering Repair Authorization EC/EA and AD 2012-11-09; Step 2-B1 appears to have the mechanic inspect the existing cable; install the mask and insert [Release] Cable pin into the striker pin of the cylinder if no damage was found. There was a misunderstanding by the [maintenance] crew of Step 2 of AD 2012-11-09; since the mechanic had to install a new cable; which is not addressed in AD 2012-11-09. As a result; the Cable assembly and oxygen masks were incorrectly installed on a B777-200 Aircraft during reactivation of the Oxygen System.Additional reference should include an Illustrated Parts Catalog (IPC) 35-21-01-40b (item C) for a better understanding of [Release] Cable routing. Also add a [maintenance] step to install any missing cable to [passenger O2] box; including hardware; into the Engineering Kit for AD 2012-11-09 and better training.
Data retrieved from NASA's ASRS site 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.