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An aircraft inspector reports about the failure of 50 passenger service unit (psu) oxygen masks' doors that would not open on an A330 aircraft during a 'manual mask release' check. A second test noted that 38 different psu doors failed to open. The wide body aircraft has a 2-5-2 passenger seat row configuration. Each psu unit has either three or six masks.
| Attributes | |
| ACN | 1132342 |
| Time | |
| Date | 201311 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | A330 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Oxygen System/Pax |
| Person 1 | |
| Function | Inspector |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Experience | Maintenance Inspector 30 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
During operational check of [passenger oxygen] 'manual mask release'; several (more than 50) did not drop. After replacing solenoids; accomplished test again. Some dropped some didn't; with any rhyme or reason as to which ones dropped and which didn't. No single [cabin] zone and helter skelter on which ones dropped. Fear this may be a fleet issue and wanted to report in case anybody else had similar problems. Engineering order (east/O) was issued.
Original NASA ASRS Text
Title: An Aircraft Inspector reports about the failure of 50 Passenger Service Unit (PSU) oxygen masks' doors that would not open on an A330 aircraft during a 'Manual Mask Release' Check. A second test noted that 38 different PSU doors failed to open. The wide body aircraft has a 2-5-2 passenger seat row configuration. Each PSU unit has either three or six masks.
Narrative: During Operational Check of [passenger oxygen] 'Manual Mask Release'; several (more than 50) did not drop. After replacing solenoids; accomplished test again. Some dropped some didn't; with any rhyme or reason as to which ones dropped and which didn't. No single [Cabin] Zone and helter skelter on which ones dropped. Fear this may be a fleet issue and wanted to report in case anybody else had similar problems. Engineering Order (E/O) was issued.
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.