A B757-200 descended to 10000 MSL and returned to their departure airport when the pressurization sy...

Attributes
ACN	956804
Time
Date	201106
Place
Locale Reference	ZNY.ARTCC
State Reference	NY
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	First Officer Relief Pilot
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Just after departure the cockpit temp was very warm 33 to 35 degrees C with very low air flow. The crew attempted to cool the compartment and increase airflow. Just after level off at FL330 we got the cabin altitude alert. I was the international relief officer on the flight. The captain and first officer performed QRH procedures. We descended to 10;000 feet and returned to our departure airport. Company requested we make an overweight landing; which we did.

Original NASA ASRS Text

Title: A B757-200 descended to 10000 MSL and returned to their departure airport when the pressurization system was unable to maintain the programmed cabin altitude.

Narrative: Just after departure the cockpit temp was very warm 33 to 35 degrees C with very low air flow. The crew attempted to cool the compartment and increase airflow. Just after level off at FL330 we got the cabin altitude alert. I was the IRO on the flight. The Captain and First Officer performed QRH procedures. We descended to 10;000 feet and returned to our departure airport. Company requested we make an overweight landing; which we did.

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.