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The captain of a B737 discovered the crew oxygen system failed to maintain pressure during the pre-flight check. Maintenance found the bottle valve only cracked open. When fully opened the system checked properly.
| Attributes | |
| ACN | 1228208 |
| Time | |
| Date | 201412 |
| Local Time Of Day | 1201-1800 |
| 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 | Taxi |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 18000 Flight Crew Type 1000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
During my preflight cockpit setup; I tested the crew oxygen system. While depressing the 100%/test button on the oxygen mask; I noticed that the crew oxygen pressure on the overhead panel indicated 0 psi. When I released the press to test button; the pressure went back up to 1700 psi. I checked the other two masks in the cockpit and found the same issue. I wrote up the issue and maintenance came out to check the oxygen bottle in the forward cargo compartment. The mechanic found that after servicing the day before; the oxygen bottle valve had only been cracked open; not fully opened. He corrected the situation and we verified proper operation of the crew oxygen system.
Original NASA ASRS Text
Title: The Captain of a B737 discovered the crew oxygen system failed to maintain pressure during the pre-flight check. Maintenance found the bottle valve only cracked open. When fully opened the system checked properly.
Narrative: During my preflight cockpit setup; I tested the Crew Oxygen system. While depressing the 100%/Test button on the oxygen mask; I noticed that the Crew Oxygen pressure on the overhead panel indicated 0 PSI. When I released the press to test button; the pressure went back up to 1700 PSI. I checked the other two masks in the cockpit and found the same issue. I wrote up the issue and maintenance came out to check the oxygen bottle in the forward cargo compartment. The mechanic found that after servicing the day before; the oxygen bottle valve had only been cracked open; not fully opened. He corrected the situation and we verified proper operation of the crew oxygen system.
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.