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A321 captain reported that an oxygen mask malfunction resulted in a diversion.
| Attributes | |
| ACN | 1705644 |
| Time | |
| Date | 201911 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | A321 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
After climb out; we set up a restroom break. When I pulled my O2 mask out of the compartment; the hose blew off. I was able to reattach it; but while the first officer was in the lavatory; the hose blew off again and this time; the retaining ferrule blew off and I was unable to find it. I wasn't able to reattach the hose and the oxygen was flowing out at full pressure. I turned off the crew supply and arranged a phone patch to maintenance operations. Upon conferring with maintenance; we agreed that we could not continue. We [advised ATC] and returned to our departure point where an overweight landing was made. If I had to guess; I'd say some pilots probably remove the mask incorrectly by pulling on the hose; rather than using the red release tabs. Whatever the cause; the hose was loose enough that when I went to put the mask on; the oxygen pressure blew the hose off its connection to the mask.
Original NASA ASRS Text
Title: A321 Captain reported that an oxygen mask malfunction resulted in a diversion.
Narrative: After climb out; we set up a restroom break. When I pulled my O2 mask out of the compartment; the hose blew off. I was able to reattach it; but while the First Officer was in the lavatory; the hose blew off again and this time; the retaining ferrule blew off and I was unable to find it. I wasn't able to reattach the hose and the oxygen was flowing out at full pressure. I turned off the crew supply and arranged a phone patch to maintenance operations. Upon conferring with maintenance; we agreed that we could not continue. We [advised ATC] and returned to our departure point where an overweight landing was made. If I had to guess; I'd say some pilots probably remove the mask incorrectly by pulling on the hose; rather than using the red release tabs. Whatever the cause; the hose was loose enough that when I went to put the mask on; the oxygen pressure blew the hose off its connection to the mask.
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.