<< >> NASA ASRS Report 956888, June 2011

A B757-200 performed an emergency descent and returned to its departure airport when unable to maintain cabin pressurization.

Attributes
ACN	956888
Time
Date	201106
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
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 Pilot Flying
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

After reaching cruise flight at fl 330 we received an EICAS cabin altitude warning and siren. The cabin was indeed above 14000 MSL. We followed the QRH and made a quick descent down to 10000 MSL. After contacting dispatch the decision was made to return to ZZZ where an uneventful overweight landing was made. The flight was continued on a different aircraft. Prior to the cabin altitude warning there were no abnormal instrument readings or indications. During climb out the cockpit became very warm with no airflow out of the 'eye balls' in the cockpit. After turning the left pack switch to warm we regained; after some time; control over the temperature and everything seemed normal.

Related reports:

• CRJ200 cabin pressurization became uncontrollable. Flight cr...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: A B757-200 performed an emergency descent and returned to its departure airport when unable to maintain cabin pressurization.

Narrative: After reaching cruise flight at FL 330 we received an EICAS cabin altitude warning and siren. The cabin was indeed above 14000 MSL. We followed the QRH and made a quick descent down to 10000 MSL. After contacting dispatch the decision was made to return to ZZZ where an uneventful overweight landing was made. The flight was continued on a different aircraft. Prior to the cabin altitude warning there were no abnormal instrument readings or indications. During climb out the cockpit became very warm with no airflow out of the 'eye balls' in the cockpit. After turning the left pack switch to warm we regained; after some time; control over the temperature and everything seemed normal.

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.