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First officer reported that some crew oxygen shut off valves are not restored properly after servicing and how to diagnose such a situation.
| Attributes | |
| ACN | 1394107 |
| Time | |
| Date | 201610 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 14627 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Procedural Maintenance |
Narrative:
On preflight O2 check; noticed pressure dropped rapidly; then recovered about 20 psi. I had been taught that this was an indication of the O2 valve not fully open. We asked for a mechanic; explaining that we had a question about the valve. When the mechanic came into the cockpit; he told us that he had checked the valve on the way up; and found it almost closed. I don't know how many flights the aircraft had flown since the O2 system had been worked on; but asking other pilots; few seem to know to check for the recovery of pressure as a sign of insufficient flow through the valve. I believe the fleet needs communication on this potentially disastrous mistake; and maintenance needs training emphasized.
Original NASA ASRS Text
Title: First Officer reported that some crew oxygen shut off valves are not restored properly after servicing and how to diagnose such a situation.
Narrative: On preflight O2 check; noticed pressure dropped rapidly; then recovered about 20 PSI. I had been taught that this was an indication of the O2 valve not fully open. We asked for a mechanic; explaining that we had a question about the valve. When the mechanic came into the cockpit; he told us that he had checked the valve on the way up; and found it almost closed. I don't know how many flights the aircraft had flown since the O2 system had been worked on; but asking other pilots; few seem to know to check for the recovery of pressure as a sign of insufficient flow through the valve. I believe the fleet needs communication on this potentially disastrous mistake; and maintenance needs training emphasized.
Data retrieved from NASA's ASRS site 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.