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A330 captain reported diverting to an alternate after noticing the crew oxygen system had developed a leak.
| Attributes | |
| ACN | 1368775 |
| Time | |
| Date | 201607 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | A330 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Climbing through FL230 first officer and I heard an unusual 'air leak' sound prompting us to investigate the integrity of crew oxygen supply system. Upon examination; we noted that the system pressure was decreasing approximately 80-100 psi per hour. We reset all O2 mask assemblies without apparent success. Pressure drop continued unabated; eventually decreasing from 1683 to 1496 psi. We were in contact with our company for the duration of this event and it was jointly decided to divert to [a suitable alternate] rather than attempt an oceanic crossing with a probable defective system.
Original NASA ASRS Text
Title: A330 Captain reported diverting to an alternate after noticing the crew oxygen system had developed a leak.
Narrative: Climbing through FL230 First Officer and I heard an unusual 'air leak' sound prompting us to investigate the integrity of crew oxygen supply system. Upon examination; we noted that the system pressure was decreasing approximately 80-100 PSI per hour. We reset all O2 mask assemblies without apparent success. Pressure drop continued unabated; eventually decreasing from 1683 to 1496 PSI. We were in contact with our company for the duration of this event and it was jointly decided to divert to [a suitable alternate] rather than attempt an oceanic crossing with a probable defective system.
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.