<< >> NASA ASRS Report 1391718, October 2016

Emb-145 flight crew reported they were dispatched with one pack inoperative. During climbout; the second pack failed resulting in impending depressurization. The flight returned to the departure airport and landed normally.

Attributes
ACN	1391718
Time
Date	201610
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	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Climbing thru FL190 to FL240 we received a cabin alt warning. #1 pack MEL'd. Cas advisory message had changed to pack valve 1-2 closed. Stopped climb; contacted ATC for lower. They gave us FL180. Did QRH for advisory message by resetting #2 pack valve. Cabin continues to climb ATC could not issue us a lower altitude. Pack #2 was not coming online. [Advised ATC]. Pack #2 valve did close but auto systems would not repressurize aircraft. Returned to departure airport for an approximately 44;000 lb landing.

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Original NASA ASRS Text

Title: EMB-145 flight crew reported they were dispatched with one pack inoperative. During climbout; the second pack failed resulting in impending depressurization. The flight returned to the departure airport and landed normally.

Narrative: Climbing thru FL190 to FL240 we received a cabin alt warning. #1 Pack MEL'd. CAS advisory message had changed to pack valve 1-2 closed. Stopped climb; contacted ATC for lower. They gave us FL180. Did QRH for advisory message by resetting #2 Pack valve. Cabin continues to climb ATC could not issue us a lower altitude. Pack #2 was not coming online. [Advised ATC]. Pack #2 valve did close but auto systems would not repressurize aircraft. Returned to departure airport for an approximately 44;000 lb landing.

Data retrieved from NASA's ASRS site 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.