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B757 flight crew operating with trim air deferred and packs in standby normal; experienced bulging ceilings and side walls in the cabin when the left pack was set to standby warm. An emergency was declared and the flight returned to their departure airport.
| Attributes | |
| ACN | 849526 |
| Time | |
| Date | 200908 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Air Conditioning Distribution System |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 10000 Flight Crew Type 6000 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 12500 Flight Crew Type 270 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
The trim air system on our assigned aircraft was inoperative and deferred. We were operating with all temperature controllers in the off position and both packs in stby normal. As we climbed through approximately 15;000 the cockpit temperature got very cold. The left pack was switched to stby warm to bring the cockpit temperature up to a reasonable level. The volume of air increased and thereafter the flight attendants called to report a loud bang and bulging ceiling and sidewall panels near the over wing area. Due to the uncertainty of the situation; an emergency was declared and we made an uneventful return landing overweight on runway 10 with a smooth touchdown.
Original NASA ASRS Text
Title: B757 flight crew operating with trim air deferred and packs in standby normal; experienced bulging ceilings and side walls in the cabin when the left pack was set to standby warm. An emergency was declared and the flight returned to their departure airport.
Narrative: The trim air system on our assigned aircraft was inoperative and deferred. We were operating with all temperature controllers in the off position and both packs in STBY normal. As we climbed through approximately 15;000 the cockpit temperature got very cold. The left pack was switched to STBY warm to bring the cockpit temperature up to a reasonable level. The volume of air increased and thereafter the flight attendants called to report a loud bang and bulging ceiling and sidewall panels near the over wing area. Due to the uncertainty of the situation; an emergency was declared and we made an uneventful return landing overweight on Runway 10 with a smooth touchdown.
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.