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During preflight B737-800 flight crew discovers the crew oxygen is not fully opened. They believe that it may have been this way since it was serviced two days prior.
| Attributes | |
| ACN | 734431 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 150 flight time type : 5000 |
| ASRS Report | 734431 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far |
| Independent Detector | other flight crewa |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : testing |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Company |
| Primary Problem | Ambiguous |
Narrative:
During oxygen check; the overhead pressure dropped 300 psi. I got the first officer to join me in the check and together we got the pressure to drop to zero. Maintenance found the oxygen valve not fully opened. The oxygen had been svced 2 days prior. I hate to think what would have happened if this aircraft had suffered a rapid depressurization. We would have lost this aircraft and all aboard. I cannot believe this aircraft flew for 2 days and no one caught this.
Original NASA ASRS Text
Title: DURING PREFLIGHT B737-800 FLT CREW DISCOVERS THE CREW OXYGEN IS NOT FULLY OPENED. THEY BELIEVE THAT IT MAY HAVE BEEN THIS WAY SINCE IT WAS SERVICED TWO DAYS PRIOR.
Narrative: DURING OXYGEN CHK; THE OVERHEAD PRESSURE DROPPED 300 PSI. I GOT THE FO TO JOIN ME IN THE CHK AND TOGETHER WE GOT THE PRESSURE TO DROP TO ZERO. MAINT FOUND THE OXYGEN VALVE NOT FULLY OPENED. THE OXYGEN HAD BEEN SVCED 2 DAYS PRIOR. I HATE TO THINK WHAT WOULD HAVE HAPPENED IF THIS ACFT HAD SUFFERED A RAPID DEPRESSURIZATION. WE WOULD HAVE LOST THIS ACFT AND ALL ABOARD. I CANNOT BELIEVE THIS ACFT FLEW FOR 2 DAYS AND NO ONE CAUGHT THIS.
Data retrieved from NASA's ASRS site as of January 2009 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.