<< >> NASA ASRS Report 1032051, August 2012

B737-800 captain reported pressurization problems after departure with one pack deferred. Flight returned to departure airport.

Attributes
ACN	1032051
Time
Date	201208
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Pressurization System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Departed with one a/C pack inoperative; after a few minutes at cruise the 'pressurization flow' light came on and the cabin was showing a slow (300 FPM) climb. After QRH procedures complied with still unable to stop the cabin climb. With outflow valve closed and manually locked; airfoil switches off; and pneumatic crossfeeds closed the cabin continued to climb. We were at FL240 and descended to FL180 before the cabin climb rate slowed down. I knew we cannot make it to [destination] at FL180 so we elected to return to [departure airport]. We declared an emergency for the overweight landing.

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Original NASA ASRS Text

Title: B737-800 Captain reported pressurization problems after departure with one pack deferred. Flight returned to departure airport.

Narrative: Departed with one A/C pack inoperative; after a few minutes at cruise the 'Pressurization Flow' light came on and the cabin was showing a slow (300 FPM) climb. After QRH procedures complied with still unable to stop the cabin climb. With outflow valve closed and manually locked; airfoil switches off; and pneumatic crossfeeds closed the cabin continued to climb. We were at FL240 and descended to FL180 before the cabin climb rate slowed down. I knew we cannot make it to [destination] at FL180 so we elected to return to [departure airport]. We declared an emergency for the overweight landing.

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.