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A B737-700 pilot reports that the flight crew that flew the aircraft after he did reported the crew oxygen valve may have been closed.
| Attributes | |
| ACN | 772405 |
| Time | |
| Date | 200802 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 772405 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : published procedure non adherence : far |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : testing |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
Crew that flew the aircraft after we did reported the crew O2 valve may have been closed. Crew oxygen valve may have been closed.callback conversation with reporter revealed the following information: reporter stated their carrier has some next gen aircraft that use steel oxygen bottles; not just composite type. But; the composite bottles seem to be the focus of concern due to the test procedure for the 'press to test' oxygen mask supply may not be adequate enough for the flight crew to identify an actual low flow in the supply line from a valve handle not fully opened. Other carriers; including his; have implemented a minimum 5-SECOND 'press to test' procedure in their flight operations manual. But; after his most recent flight; when the outbound crew flew the same aircraft he came in on and reported the oxygen flow problem; there is a feeling the 5-SECOND flow test may need to be revisited. Reporter also stated their B737-700's do not have a crew oxygen shut-off valve in the cockpit; only in the lower east/east compartment at the bottle itself. He does not know if their crew oxygen bottles are removed for servicing or re-supplied from an external service panel on the aircraft.
Original NASA ASRS Text
Title: A B737-700 PLT RPTS THAT THE FLIGHT CREW THAT FLEW THE ACFT AFTER HE DID RPTED THE CREW OXYGEN VALVE MAY HAVE BEEN CLOSED.
Narrative: CREW THAT FLEW THE ACFT AFTER WE DID RPTED THE CREW O2 VALVE MAY HAVE BEEN CLOSED. CREW OXYGEN VALVE MAY HAVE BEEN CLOSED.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THEIR CARRIER HAS SOME NEXT GEN ACFT THAT USE STEEL OXYGEN BOTTLES; NOT JUST COMPOSITE TYPE. BUT; THE COMPOSITE BOTTLES SEEM TO BE THE FOCUS OF CONCERN DUE TO THE TEST PROC FOR THE 'PRESS TO TEST' OXYGEN MASK SUPPLY MAY NOT BE ADEQUATE ENOUGH FOR THE FLIGHT CREW TO IDENTIFY AN ACTUAL LOW FLOW IN THE SUPPLY LINE FROM A VALVE HANDLE NOT FULLY OPENED. OTHER CARRIERS; INCLUDING HIS; HAVE IMPLEMENTED A MINIMUM 5-SECOND 'PRESS TO TEST' PROC IN THEIR FLT OPS MANUAL. BUT; AFTER HIS MOST RECENT FLT; WHEN THE OUTBOUND CREW FLEW THE SAME ACFT HE CAME IN ON AND RPTED THE OXYGEN FLOW PROBLEM; THERE IS A FEELING THE 5-SECOND FLOW TEST MAY NEED TO BE REVISITED. RPTR ALSO STATED THEIR B737-700'S DO NOT HAVE A CREW OXYGEN SHUT-OFF VALVE IN THE COCKPIT; ONLY IN THE LOWER E/E COMPARTMENT AT THE BOTTLE ITSELF. HE DOES NOT KNOW IF THEIR CREW OXYGEN BOTTLES ARE REMOVED FOR SERVICING OR RE-SUPPLIED FROM AN EXTERNAL SERVICE PANEL ON THE ACFT.
Data retrieved from NASA's ASRS site as of May 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.