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B737 ng captain reported diverting to an alternate when the crew oxygen pressure dropped below 500 psi while enroute.
| Attributes | |
| ACN | 1472732 |
| Time | |
| Date | 201708 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 2746.98 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
During my preflight; I had confirmed that the crew oxygen level was at 1200 psi. Enroute I wrote up the captain's O2 mask housing needs [to be] secured. Maintenance corrected the housing [at our enroute stop]. I noted that the O2 level had decreased below 1000 psi. Enroute to [next destination]; at FL320 I noted that the O2 level had decreased to below 500 psi. Checking the limitations section of the FM; I saw that the level was below that required for dispatch. I notified [maintenance] on ACARS and submitted a [maintenance] code for low crew oxygen pressure. My first officer and I discussed possibly flying at a lower altitude due to the depleting oxygen supply. We brought [dispatch] into the conversation. The [flight operations manager] immediately joined the conversation. Together we agreed that the best course of action was a diversion to land [at a nearby alternate]. We notified ATC and received a clearance [to the alternate]. I notified the flight attendants and the passengers. We landed uneventfully.coincidentally; this is my second B737 crew oxygen issue in a month. I started a trip earlier in the month and found an airplane with [zero] crew oxygen pressure.
Original NASA ASRS Text
Title: B737 NG Captain reported diverting to an alternate when the crew oxygen pressure dropped below 500 PSI while enroute.
Narrative: During my preflight; I had confirmed that the Crew Oxygen level was at 1200 PSI. Enroute I wrote up the Captain's O2 Mask Housing needs [to be] secured. Maintenance corrected the housing [at our enroute stop]. I noted that the O2 level had decreased below 1000 PSI. Enroute to [next destination]; at FL320 I noted that the O2 level had decreased to below 500 PSI. Checking the limitations section of the FM; I saw that the level was below that required for Dispatch. I notified [Maintenance] on ACARS and submitted a [maintenance] code for low Crew Oxygen pressure. My FO and I discussed possibly flying at a lower altitude due to the depleting Oxygen supply. We brought [Dispatch] into the conversation. The [Flight Operations Manager] immediately joined the conversation. Together we agreed that the best course of action was a diversion to land [at a nearby alternate]. We notified ATC and received a clearance [to the alternate]. I notified the flight attendants and the passengers. We landed uneventfully.Coincidentally; this is my second B737 Crew Oxygen issue in a month. I started a trip earlier in the month and found an airplane with [zero] Crew Oxygen pressure.
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.