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Boeing 737 ng captain reported a failed crew oxygen preflight test caused by the bottle valve not fully opened.
| Attributes | |
| ACN | 1538385 |
| Time | |
| Date | 201804 |
| Place | |
| Locale Reference | SFO.Airport |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 106 Flight Crew Total 9923 Flight Crew Type 5060 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance |
Narrative:
The oxygen bottle was removed and replaced prior to the flight. While performing my preflight duties; the oxygen mask test failed. The oxygen [pressure indication] was at 1800 psi and decreased to 200 psi (a 1600 psi drop; the maximum drop allowed is 100 psi). I wrote it up and called maintenance to inform them of the issue. The technician that looked at it said that the valve was not in the proper open position. He opened it to the proper position and the oxygen mask test passed (there was no drop).
Original NASA ASRS Text
Title: Boeing 737 NG Captain reported a failed crew oxygen preflight test caused by the bottle valve not fully opened.
Narrative: The oxygen bottle was removed and replaced prior to the flight. While performing my preflight duties; the oxygen mask test failed. The oxygen [pressure indication] was at 1800 PSI and decreased to 200 PSI (a 1600 PSI drop; the maximum drop allowed is 100 PSI). I wrote it up and called Maintenance to inform them of the issue. The technician that looked at it said that the valve was not in the proper open position. He opened it to the proper position and the oxygen mask test passed (there was no drop).
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.