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B737NG captain reported problems with crew oxygen quantity.
| Attributes | |
| ACN | 1570155 |
| Time | |
| Date | 201808 |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| 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) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Type 4066 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Preflight of mask and oxygen indicated normal system. I addressed the supply at 750 psi to first officer; but said it was good to go. About 2.5 hours into flight I noticed oxygen level was 200 psi. At that point I contacted dispatch and got [maintenance control] phone patch. The oxygen level continued to drop even though we were not using masks. As oxygen was approaching zero; [advised ATC] and requested divert to [an alternate airport]. I could still hear dispatch on [commercial radio] frequency saying not to divert to [a nearby airport] because of thunderstorms hitting field. We also received an ACARS message saying not to use [the nearby airport]. At lower altitude I could no longer speak with dispatch on [commercial radio] frequency. Divert to [the alternate airport] accomplished without incident. Contract maintenance checked cockpit oxygen and verified zero remaining. We elected to descend; divert and [advise ATC] because of no oxygen for use in decompression or smoke/fire in cockpit.
Original NASA ASRS Text
Title: B737NG Captain reported problems with crew oxygen quantity.
Narrative: Preflight of mask and oxygen indicated normal system. I addressed the supply at 750 PSI to First Officer; but said it was good to go. About 2.5 hours into flight I noticed oxygen level was 200 PSI. At that point I contacted Dispatch and got [Maintenance Control] phone patch. The oxygen level continued to drop even though we were not using masks. As oxygen was approaching zero; [advised ATC] and requested divert to [an alternate airport]. I could still hear Dispatch on [Commercial Radio] frequency saying not to divert to [a nearby airport] because of thunderstorms hitting field. We also received an ACARS message saying not to use [the nearby airport]. At lower altitude I could no longer speak with Dispatch on [Commercial Radio] Frequency. Divert to [the alternate airport] accomplished without incident. Contract maintenance checked cockpit oxygen and verified zero remaining. We elected to descend; divert and [advise ATC] because of no oxygen for use in decompression or smoke/fire in cockpit.
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.