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A line mechanic was notified two days after he had serviced a crew oxygen bottle on a B767 that another mechanic had noticed the crew oxygen indication had fluctuated. The carbon fiber composite bottle open/close handle was found in the closed position.
| Attributes | |
| ACN | 877566 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 0601-1200 |
| 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 |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Technician 19 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
During service check on B767-300 aircraft; found oxygen pressure reads 900 psi. Serviced oxygen to 1650 psi. Opened oxygen valve fully then turned valve 1/4 back turn and safety wired valve. Verified pressure. Gauge on oxygen cylinder and flight deck CDU status was the same reading; flight flew with no problem noted by flight crew. The next day a mechanic tested oxygen pressure. It seems to go to zero; then back to 1650 psi. He wrote a non-routine log write-up that the oxygen bottle was in a 'close' position. I later reviewed the oxygen servicing video.
Original NASA ASRS Text
Title: A Line Mechanic was notified two days after he had serviced a Crew Oxygen bottle on a B767 that another Mechanic had noticed the Crew oxygen indication had fluctuated. The Carbon Fiber Composite bottle Open/Close handle was found in the closed position.
Narrative: During Service Check on B767-300 aircraft; found Oxygen pressure reads 900 psi. Serviced oxygen to 1650 psi. Opened Oxygen valve fully then turned valve 1/4 back turn and safety wired valve. Verified pressure. Gauge on Oxygen cylinder and Flight deck CDU status was the same reading; flight flew with no problem noted by Flight crew. The next day a Mechanic tested Oxygen pressure. It seems to go to zero; then back to 1650 psi. He wrote a Non-Routine Log write-up that the Oxygen bottle was in a 'close' position. I later reviewed the Oxygen servicing video.
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.