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A B737-900 captain reported noticing about halfway through a transcontinental flight that the flight crew oxygen showed zero pressure. The flight descended to FL250 for the balance of the trip.
| Attributes | |
| ACN | 1342351 |
| Time | |
| Date | 201603 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Other / Unknown |
Narrative:
Approximately 3.5 hours into [the] flight the first officer (first officer) reached for his O2 mask and realized we had no [flight crew] O2; the gauge read zero. I asked the a flight attendant to bring an O2 bottle to the flight deck. The first officer and I started to search our [tablets] for company guidance on this type of event. While the first officer searched I made a sat call to our dispatcher for guidance on this issue. Dispatcher sent me a flight plan at FL250. With this information elected to descend to FL250 for remainder of the flight. The masks were stowed from [departure] to the time we took our break. Both first officer and I recall testing our masks and determined that we had about 1;500 psi O2 prior to departure. Remainder of flight uneventful; further evidence we never know where treats may present themselves and to remain vigilant. The event was handled well; with good guidance from [flight operations]; dispatcher; and crew to minimize the other threats an event like this can cause. Not sure; one of the crew masks may not have been stowed properly.
Original NASA ASRS Text
Title: A B737-900 Captain reported noticing about halfway through a transcontinental flight that the flight crew oxygen showed zero pressure. The flight descended to FL250 for the balance of the trip.
Narrative: Approximately 3.5 hours into [the] flight the First Officer (FO) reached for his O2 mask and realized we had no [flight crew] O2; the gauge read zero. I asked the A flight attendant to bring an O2 bottle to the flight deck. The FO and I started to search our [tablets] for company guidance on this type of event. While the FO searched I made a sat call to our dispatcher for guidance on this issue. Dispatcher sent me a flight plan at FL250. With this information elected to descend to FL250 for remainder of the flight. The masks were stowed from [departure] to the time we took our break. Both FO and I recall testing our masks and determined that we had about 1;500 PSI O2 prior to departure. Remainder of flight uneventful; further evidence we never know where treats may present themselves and to remain vigilant. The event was handled well; with good guidance from [flight operations]; Dispatcher; and crew to minimize the other threats an event like this can cause. Not sure; one of the crew masks may not have been stowed properly.
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.