 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B757's left pack air conditioning duct ruptured slightly at takeoff; then completely failed at FL280; causing the loss of cabin pressurization. The crew declared an emergency and returned to the departure airport.
| Attributes | |
| ACN | 999257 |
| Time | |
| Date | 201203 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| 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 Ducting Clamps Connectors |
| Person 1 | |
| Function | Captain Pilot Flying |
| Experience | Flight Crew Last 90 Days 300 Flight Crew Total 20000 Flight Crew Type 12000 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Experience | Flight Crew Last 90 Days 60 Flight Crew Total 13300 Flight Crew Type 4500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
As takeoff power was applied a dull thud was heard from behind the cockpit. All engine indications were normal and the takeoff was continued. While climbing through 10;000 ft the cockpit temperature became uncontrollable. At approximately FL280 the master caution warning illuminated with an altitude warning horn; the cabin altitude was above 10;000 ft and climbing at a rate of 1;000 ft per minute. All appropriate QRH items were completed and an emergency descent was completed to 10;000 ft. Passenger oxygen masks did not deploy. ATC was informed; and we returned to the airport. Dispatch and maintenance were notified of the aircraft status. A flap 25; overweight landing was accomplished to a successful outcome. We returned the aircraft to the gate and the passengers were deplaned.
Original NASA ASRS Text
Title: A B757's left pack air conditioning duct ruptured slightly at takeoff; then completely failed at FL280; causing the loss of cabin pressurization. The crew declared an emergency and returned to the departure airport.
Narrative: As takeoff power was applied a dull thud was heard from behind the cockpit. All engine indications were normal and the takeoff was continued. While climbing through 10;000 FT the cockpit temperature became uncontrollable. At approximately FL280 the master caution warning illuminated with an altitude warning horn; the cabin altitude was above 10;000 FT and climbing at a rate of 1;000 FT per minute. All appropriate QRH items were completed and an emergency descent was completed to 10;000 FT. Passenger oxygen masks did not deploy. ATC was informed; and we returned to the airport. Dispatch and Maintenance were notified of the aircraft status. A flap 25; overweight landing was accomplished to a successful outcome. We returned the aircraft to the gate and the passengers were deplaned.
Data retrieved from NASA's ASRS site as of July 2013 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.