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A B767-300 returned to the foreign departure airport after climb out because the equipment cooling/pressurization system was malfunctioning. The equipment cooling system had been MEL'ed prior to departure.
| Attributes | |
| ACN | 855728 |
| Time | |
| Date | 200910 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZZ |
| State Reference | FO |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Pressurization System |
| Person 1 | |
| Function | Pilot Not Flying Relief Pilot |
| Experience | Flight Crew Last 90 Days 200 Flight Crew Total 10000 Flight Crew Type 4800 |
| Person 2 | |
| Function | Dispatcher |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Maintenance was performed on the equipment cooling system prior to departure. I reentered the cockpit after awakening early from the first break cycle. The cockpit crew was executing the cabin altitude depressurization qrc while starting a descent. After the qrc was complete; I noticed the cabin alt indicating 11;0000' and the cabin altitude alert warning illuminated. An emergency was declared for a rapid descent below 10;000'; and a return to our departure airport. The captain handled ATC; which was challenging with the language difference and the oxygen mask on. The first officer continued flying and landed uneventfully. I as the relief officer handled communications with dispatch via ACARS; the cabin crew; passengers; and backed up the remaining pilots duties and checklist. Fuel dumping was commanded; coordinated with ATC and terminated by 7000'. Cabin advisory declared; emergency equipment requested for possible hot brakes and overweight landing. Aircraft was inspected for overweight landing; a new maintenance release was issued; refiled; refueled; and departed.
Original NASA ASRS Text
Title: A B767-300 returned to the foreign departure airport after climb out because the Equipment Cooling/pressurization System was malfunctioning. The Equipment Cooling System had been MEL'ed prior to departure.
Narrative: Maintenance was performed on the Equipment Cooling system prior to departure. I reentered the cockpit after awakening early from the first break cycle. The Cockpit Crew was executing the Cabin Altitude Depressurization QRC while starting a descent. After the QRC was complete; I noticed the cabin alt indicating 11;0000' and the Cabin Altitude Alert warning illuminated. An emergency was declared for a rapid descent below 10;000'; and a return to our departure airport. The Captain handled ATC; which was challenging with the language difference and the oxygen mask on. The First Officer continued flying and landed uneventfully. I as the Relief Officer handled communications with Dispatch via ACARS; the cabin crew; passengers; and backed up the remaining pilots duties and checklist. Fuel dumping was commanded; coordinated with ATC and terminated by 7000'. Cabin advisory declared; emergency equipment requested for possible hot brakes and overweight landing. Aircraft was inspected for overweight landing; a new maintenance release was issued; refiled; refueled; and departed.
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.