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B737 flight crew reported that the oxygen pressure on the crew oxygen bottle decreased rapidly in flight; resulting in a diversion.
| Attributes | |
| ACN | 1705112 |
| Time | |
| Date | 201911 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| 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 Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 210 Flight Crew Total 29640 Flight Crew Type 18486 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 123 Flight Crew Total 2624 Flight Crew Type 305 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Approximately 2 hours into the flight; the first officer (first officer) noticed that our oxygen pressure was below 400 psi. I conferenced dispatch and [maintenance] and decided to [advise ATC] and divert to ZZZ. By the time we landed it had dropped to 250 psi. Maintenance there found a leaking valve on the bottle head. The pressure on preflight was above 600 which was well above the temperature corrected limit of 470 for 2 pilots. The first officer noted just before takeoff that the pressure was unchanged. I had checked inbound write ups and the current [maintenance release] but didn't notice in the log history that the oxygen had recently been serviced or I would have queried maintenance in ZZZ1 prior to departure.
Original NASA ASRS Text
Title: B737 flight crew reported that the oxygen pressure on the crew oxygen bottle decreased rapidly in flight; resulting in a diversion.
Narrative: Approximately 2 hours into the flight; the FO (First Officer) noticed that our oxygen pressure was below 400 psi. I conferenced Dispatch and [Maintenance] and decided to [advise ATC] and divert to ZZZ. By the time we landed it had dropped to 250 psi. Maintenance there found a leaking valve on the bottle head. The pressure on preflight was above 600 which was well above the temperature corrected limit of 470 for 2 pilots. The FO noted just before takeoff that the pressure was unchanged. I had checked inbound write ups and the current [Maintenance Release] but didn't notice in the log history that the oxygen had recently been serviced or I would have queried Maintenance in ZZZ1 prior to departure.
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.