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An embraer phenom flight crew described a leak in the crew oxygen system that resulted in a descent and an uneventful diversion.
| Attributes | |
| ACN | 1296040 |
| Time | |
| Date | 201509 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Embraer Phenom 300 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Crew |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
In cruise FL410 and noticed oxygen pressure was 1;250 psi and had been 1;900 psi an hour earlier during preflight. Contacted ATC and requested lower and they gave me FL330. During descent oxygen leak increased rapidly to where you could hear it coming from [caddy] that holds captain's oxygen mask. [Advised ATC] and requested at least FL240 which was granted. Then asked for lower with next controller and got 10;000. At about this time requested and were granted direct [nearest airfield]. Approaching airport cancelled emergency and landed uneventfully.the metal coupling between the pilot's mask hose and the aircraft supply hose on the phenom 300 needs to be beefed up. Half of the lip of the female fitting failed causing the leak. It is made of paper thin metal and subjected to stress when the mask is pulled out or put back in the well. Also it is a good idea to monitor oxygen pressure and cabin altitude when flying above 10;000 feet.
Original NASA ASRS Text
Title: An Embraer Phenom flight crew described a leak in the crew oxygen system that resulted in a descent and an uneventful diversion.
Narrative: In cruise FL410 and noticed oxygen pressure was 1;250 PSI and had been 1;900 PSI an hour earlier during preflight. Contacted ATC and requested lower and they gave me FL330. During descent oxygen leak increased rapidly to where you could hear it coming from [caddy] that holds Captain's oxygen mask. [Advised ATC] and requested at least FL240 which was granted. Then asked for lower with next controller and got 10;000. At about this time requested and were granted direct [nearest airfield]. Approaching airport cancelled emergency and landed uneventfully.The metal coupling between the pilot's mask hose and the aircraft supply hose on the Phenom 300 needs to be beefed up. Half of the lip of the female fitting failed causing the leak. It is made of paper thin metal and subjected to stress when the mask is pulled out or put back in the well. Also it is a good idea to monitor oxygen pressure and cabin altitude when flying above 10;000 feet.
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.