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A B747-400 first officer reported maintenance repeatedly refilled the crew oxygen bottle rather than diagnosing and repairing the apparent leak.
| Attributes | |
| ACN | 904528 |
| Time | |
| Date | 201008 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 175 Flight Crew Total 15000 Flight Crew Type 5000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural FAR |
Narrative:
Crew O2 system was low with several previous writeups. Captain had recently flown same aircraft and maintenance had told him they would find the leak and get back to him. Neither had happened so maintenance just keeps filling up the crew O2 and sending it out because it is legal. We went from about 1;900 psi after refill to about 1;490 on landing (1;650 is limit) so the leak was getting worse. Maybe it will get fixed after a diversion for lack of crew oxygen.
Original NASA ASRS Text
Title: A B747-400 First Officer reported maintenance repeatedly refilled the crew oxygen bottle rather than diagnosing and repairing the apparent leak.
Narrative: Crew O2 system was low with several previous writeups. Captain had recently flown same aircraft and Maintenance had told him they would find the leak and get back to him. Neither had happened so Maintenance just keeps filling up the crew O2 and sending it out because it is legal. We went from about 1;900 psi after refill to about 1;490 on landing (1;650 is limit) so the leak was getting worse. Maybe it will get fixed after a diversion for lack of crew oxygen.
Data retrieved from NASA's ASRS site as of April 2012 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.