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A passenger oxygen service unit somehow opened during climb dropping a pair of masks which then required the aircraft to level at FL290. During cruise the captain exercised his emergency authority and climbed to FL310 to clear heavy weather but descended again when clear.
| Attributes | |
| ACN | 888654 |
| Time | |
| Date | 201003 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZZ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Oxygen System/Pax |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Other / Unknown |
Narrative:
Flight descended to FL290 by center due to traffic conflict with our previous cruise due to unwanted deployed oxygen masks at seats 39A/B. The deployment occurred at some point in the climbout with cockpit crew notified passing FL280; leveled at FL300. [We had a] full flight. Unable to reseat passenger and cabin crew complied with portable oxygen requirements. Level at FL290; flight later encountered tops of heavy night IMC weather; rain showers. Requested and received climb clearance to FL310 into clear and smooth conditions. Declared exercise of captain's emergency authority; sent message to dispatch. [We] returned to FL290 when conditions below us improved one hour later.
Original NASA ASRS Text
Title: A passenger oxygen service unit somehow opened during climb dropping a pair of masks which then required the aircraft to level at FL290. During cruise the Captain exercised his emergency authority and climbed to FL310 to clear heavy weather but descended again when clear.
Narrative: Flight descended to FL290 by Center due to traffic conflict with our previous cruise due to unwanted deployed oxygen masks at seats 39A/B. The deployment occurred at some point in the climbout with cockpit crew notified passing FL280; leveled at FL300. [We had a] full flight. Unable to reseat passenger and cabin crew complied with portable oxygen requirements. Level at FL290; flight later encountered tops of heavy night IMC weather; rain showers. Requested and received climb clearance to FL310 into clear and smooth conditions. Declared exercise of Captain's Emergency Authority; sent message to Dispatch. [We] returned to FL290 when conditions below us improved one hour later.
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.