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An excessive pressure drop when the captain of a B737-400 tested his oxygen mask lead to the discovery of a nearly closed oxygen valve
| Attributes | |
| ACN | 855024 |
| Time | |
| Date | 200910 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
During preflight of the captains oxygen mask; oxygen pressure dropped approx. 100-150 psi. Maintenance technician found the oxygen valve in the aircraft belly partially closed.
Original NASA ASRS Text
Title: An excessive pressure drop when the Captain of a B737-400 tested his oxygen mask lead to the discovery of a nearly closed oxygen valve
Narrative: During preflight of the captains oxygen mask; oxygen pressure dropped approx. 100-150 psi. Maintenance technician found the oxygen valve in the aircraft belly partially closed.
Data retrieved from NASA's ASRS site as of April 2012 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.