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A B737-700 crew oxygen bottle was reported as dropping 200 pounds when tested. Reporter found shutoff valve on 02 bottle improperly adjusted.
| Attributes | |
| ACN | 575228 |
| Time | |
| Date | 200302 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 575228 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : oxygen pressure indicator other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : installation performance deficiency : logbook entry performance deficiency : testing |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On feb/mon/03, I was called to flight operations. The captain reported that oxygen pressure dropped 200 psi when testing the masks. I went down to the forward cargo bin, accessed the oxygen bottle and found the shutoff valve nearly closed. I would say between 1/8 and 1/4 turn open. I opened the valve fully, then closed 1/4 turn per maintenance manual. All system checked normal per maintenance manual. Maintenance performed.
Original NASA ASRS Text
Title: A B737-700 CREW OXYGEN BOTTLE WAS RPTED AS DROPPING 200 LBS WHEN TESTED. RPTR FOUND SHUTOFF VALVE ON 02 BOTTLE IMPROPERLY ADJUSTED.
Narrative: ON FEB/MON/03, I WAS CALLED TO FLT OPS. THE CAPT RPTED THAT OXYGEN PRESSURE DROPPED 200 PSI WHEN TESTING THE MASKS. I WENT DOWN TO THE FORWARD CARGO BIN, ACCESSED THE OXYGEN BOTTLE AND FOUND THE SHUTOFF VALVE NEARLY CLOSED. I WOULD SAY BTWN 1/8 AND 1/4 TURN OPEN. I OPENED THE VALVE FULLY, THEN CLOSED 1/4 TURN PER MAINT MANUAL. ALL SYS CHKED NORMAL PER MAINT MANUAL. MAINT PERFORMED.
Data retrieved from NASA's ASRS site as of July 2007 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.