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A B767-300 captain reports the new 10-second preflight check of their crew oxygen masks showed a 200 psi drop in oxygen pressure on their EICAS status page. Captain requested a physical confirmation of the crew oxygen bottle valve handle position. Mechanic found the crew oxygen bottle handle in the 'closed' position.
| Attributes | |
| ACN | 882262 |
| Time | |
| Date | 201004 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 17500 Flight Crew Type 6500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Other / Unknown |
Narrative:
During preflight of the oxygen system; pressure dropped from 1600 psi to 1380 psi and then came back up to 1600 psi. Maintenance was called and an ACARS message sent. Maintenance said it was ok and deferred the cockpit guage as inoperative. Mechanic asked me if I was ok with it? I told him that he needed to check and make sure the [oxygen bottle] valve was open. He checked it and the valve was closed. The mechanic opened it and cleared the item. Maintenance was not aware of our preflight procedure of the oxygen (O2) system. If we had left with the deferred item we would have gone without oxygen for the cockpit. But thanks to our new procedure for preflighting; the O2 system we caught it before we needed O2.
Original NASA ASRS Text
Title: A B767-300 Captain reports the new 10-second preflight check of their Crew Oxygen masks showed a 200 psi drop in oxygen pressure on their EICAS Status Page. Captain requested a physical confirmation of the Crew Oxygen bottle valve handle position. Mechanic found the Crew Oxygen bottle handle in the 'Closed' position.
Narrative: During preflight of the Oxygen System; pressure dropped from 1600 psi to 1380 psi and then came back up to 1600 psi. Maintenance was called and an ACARS message sent. Maintenance said it was OK and deferred the cockpit guage as inoperative. Mechanic asked me if I was OK with it? I told him that he needed to check and make sure the [oxygen bottle] valve was open. He checked it and the valve was closed. The Mechanic opened it and cleared the item. Maintenance was not aware of our preflight procedure of the Oxygen (O2) system. If we had left with the deferred item we would have gone without oxygen for the cockpit. But thanks to our new procedure for preflighting; the O2 system we caught it before we needed O2.
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.