 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737 first officer reported that the crew oxygen system failed to test properly. Maintenance found the valve on the oxygen bottle was not fully open.
| Attributes | |
| ACN | 1486360 |
| Time | |
| Date | 201710 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 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 Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 8846 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
After arriving to the aircraft; we began our preflight duties and flows. Upon checking my oxygen mask; I ran the oxygen via the test button for 5 seconds and made sure the microphone worked. However; I immediately saw the O2 psi go from 1600 to 100 instantly and stay there. When I released the test button the gauge went back to 1600 psi. I suspected the valve on the bottle itself was in the off position. I told the captain and he agreed. We made an electronic log book write-up and backed it up with a call to maintenance. They came to the plane and the mechanic was shocked. I also believe the bottle might have been slightly open as the gauge did go back to 1600 psi. However; this would not have been sufficient in a smoke/fire/depressurization emergency.the mechanic turned the bottle on. The test worked normally and we received a new [maintenance release]. The flight continued to [destination].I was concerned as the plane had only been in ZZZ for 20 minutes when we arrived. The [maintenance release] was from ZZZ1 and that indicated to me that the plane flew in that condition from ZZZ1 to ZZZ. I am extremely concerned and want to make sure that we are all safe; as well as our passengers. This is the type of maintenance condition that could have dire consequences if not caught before a flight; and things don't go as planned.
Original NASA ASRS Text
Title: B737 First Officer reported that the crew oxygen system failed to test properly. Maintenance found the valve on the oxygen bottle was not fully open.
Narrative: After arriving to the aircraft; we began our preflight duties and flows. Upon checking my oxygen mask; I ran the oxygen via the test button for 5 seconds and made sure the microphone worked. However; I immediately saw the O2 PSI go from 1600 to 100 instantly and stay there. When I released the test button the gauge went back to 1600 PSI. I suspected the valve on the bottle itself was in the off position. I told the captain and he agreed. We made an Electronic Log Book write-up and backed it up with a call to maintenance. They came to the plane and the mechanic was shocked. I also believe the bottle might have been slightly open as the gauge did go back to 1600 PSI. However; this would not have been sufficient in a smoke/fire/depressurization emergency.The mechanic turned the bottle on. The test worked normally and we received a new [maintenance release]. The flight continued to [destination].I was concerned as the plane had only been in ZZZ for 20 minutes when we arrived. The [maintenance release] was from ZZZ1 and that indicated to me that the plane flew in that condition from ZZZ1 to ZZZ. I am extremely concerned and want to make sure that we are all safe; as well as our passengers. This is the type of maintenance condition that could have dire consequences if not caught before a flight; and things don't go as planned.
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.