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A captain and first officer report that during their cockpit oxygen preflight test on a B737-800 the crew oxygen pressure dropped from 1;300 psi to less than 500 psi during the test. When the test button was released; the pressure returned to 1;300 psi. Maintenance determined the crew oxygen bottle valve handle was not fully opened.
| Attributes | |
| ACN | 947701 |
| Time | |
| Date | 201105 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| 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) |
| Person 2 | |
| Function | First Officer |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy |
Narrative:
During the cockpit oxygen preflight; the first officer noticed that the oxygen pressure dropped from 1;300 psi to less than 500 psi during the test. When the test button was released; the pressure returned to 1;300 psi. Captain side performed the same. [We] contacted maintenance. Maintenance confirmed that the cockpit oxygen valve was only opened part way. He opened the valve fully and we then performed a normal oxygen test and departed.
Original NASA ASRS Text
Title: A Captain and First Officer report that during their cockpit oxygen preflight test on a B737-800 the crew oxygen pressure dropped from 1;300 PSI to less than 500 PSI during the test. When the test button was released; the pressure returned to 1;300 PSI. Maintenance determined the crew oxygen bottle valve handle was not fully opened.
Narrative: During the cockpit oxygen preflight; the First Officer noticed that the oxygen pressure dropped from 1;300 PSI to less than 500 PSI during the test. When the test button was released; the pressure returned to 1;300 PSI. Captain side performed the same. [We] contacted Maintenance. Maintenance confirmed that the cockpit oxygen valve was only opened part way. He opened the valve fully and we then performed a normal oxygen test and departed.
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.