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An MD80 captain at cruise altitude discovered oxygen regulator leaking. Shutting off regulator stopped leak. Captain used observer's oxygen mask.
| Attributes | |
| ACN | 711353 |
| Time | |
| Date | 200609 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : rno.airport |
| State Reference | NV |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 711353 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
At cruise altitude; noticed that with captain's oxygen regulator turned on; regulator was leaking oxygen. Previous flight had noticed loss of oxygen en route and maintenance had replaced bottle/regulator. Shutting captain's regulator off stopped leak and crew had 1400 psi remaining in bottle. It was determined that captain could access observer mask which worked ok and it didn't impede movement when on. Copilot mask and regulator worked fine. After much discourse with dispatch it was decided to continue to destination with captain using the observer oxygen mask as required emergency oxygen source.
Original NASA ASRS Text
Title: AN MD80 CAPT AT CRUISE ALT DISCOVERED OXYGEN REGULATOR LEAKING. SHUTTING OFF REGULATOR STOPPED LEAK. CAPT USED OBSERVER'S OXYGEN MASK.
Narrative: AT CRUISE ALT; NOTICED THAT WITH CAPT'S OXYGEN REGULATOR TURNED ON; REGULATOR WAS LEAKING OXYGEN. PREVIOUS FLT HAD NOTICED LOSS OF OXYGEN ENRTE AND MAINT HAD REPLACED BOTTLE/REGULATOR. SHUTTING CAPT'S REGULATOR OFF STOPPED LEAK AND CREW HAD 1400 PSI REMAINING IN BOTTLE. IT WAS DETERMINED THAT CAPT COULD ACCESS OBSERVER MASK WHICH WORKED OK AND IT DIDN'T IMPEDE MOVEMENT WHEN ON. COPLT MASK AND REGULATOR WORKED FINE. AFTER MUCH DISCOURSE WITH DISPATCH IT WAS DECIDED TO CONTINUE TO DEST WITH CAPT USING THE OBSERVER OXYGEN MASK AS REQUIRED EMER OXYGEN SOURCE.
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.