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Captain was informed by his chief pilot that the crew oxygen on a B737 he had flown two legs on; had a 200 psi drop in oxygen mask pressure during a subsequent preflight check. Maintenance found the oxygen valve handle only 1/4 turn 'open'.
| Attributes | |
| ACN | 1228564 |
| Time | |
| Date | 201412 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Dawn |
| 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 218 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Informed by chief pilot on call that the oxygen psi on aircraft X dropped approximately 200 psi during a preflight check. Maintenance was notified and discovered the wheel well oxygen valve opened only 1/4 turn. I flew this aircraft two legs and do not recall any drop in oxygen psi during our preflight checks in ZZZ or ZZZ1. Maintenance discovered oxygen valve in wheel well only 1/4 turn open; 3-days after flight.
Original NASA ASRS Text
Title: Captain was informed by his Chief Pilot that the crew oxygen on a B737 he had flown two legs on; had a 200 psi drop in oxygen mask pressure during a subsequent preflight check. Maintenance found the oxygen valve handle only 1/4 turn 'Open'.
Narrative: Informed by Chief Pilot on Call that the Oxygen psi on Aircraft X dropped approximately 200 psi during a preflight check. Maintenance was notified and discovered the wheel well oxygen valve opened only 1/4 turn. I flew this aircraft two legs and do not recall any drop in oxygen psi during our preflight checks in ZZZ or ZZZ1. Maintenance discovered oxygen valve in wheel well only 1/4 turn open; 3-days after flight.
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.