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Crj-900 flight crew reported finding the first officer's oxygen mask unusable during cruise flight.
| Attributes | |
| ACN | 1713023 |
| Time | |
| Date | 201912 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Regional Jet 900 (CRJ900) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
While in cruise at 34;000 feet the first officer went to utilize his oxygen mask; so I could exit the flight deck to use the lavatory. After removing the mask from its container we discovered that the audio wire had at some point been inadvertently threaded through the headband straps. There was physically no way for us to unthread the audio wire. Subsequently this made the mask unable to be utilized. I decided to remain in the flight deck for the remainder of the flight. At the same time we unstowed the observer oxygen mask and my first officer held it in his lap until we descended to a safe altitude on the arrival. After landing I wrote up the mask as inoperative and had maintenance fix the problem. It is likely this event occurred somewhere during a maintenance inspection. There was no way for us to unthread the audio cable in flight with our knowledge of the system. Not sure how to prevent this in the future as this was likely an issue that occurred during a maintenance function.
Original NASA ASRS Text
Title: CRJ-900 flight crew reported finding the First Officer's oxygen mask unusable during cruise flight.
Narrative: While in cruise at 34;000 feet the First Officer went to utilize his oxygen mask; so I could exit the flight deck to use the lavatory. After removing the mask from its container we discovered that the audio wire had at some point been inadvertently threaded through the headband straps. There was physically no way for us to unthread the audio wire. Subsequently this made the mask unable to be utilized. I decided to remain in the flight deck for the remainder of the flight. At the same time we unstowed the Observer oxygen mask and my First Officer held it in his lap until we descended to a safe altitude on the arrival. After landing I wrote up the mask as inoperative and had maintenance fix the problem. It is likely this event occurred somewhere during a Maintenance Inspection. There was no way for us to unthread the audio cable in flight with our knowledge of the system. Not sure how to prevent this in the future as this was likely an issue that occurred during a Maintenance function.
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.