Flight crew of medium large transport departs with 1 air conditioning pack inoperative and the second pack fails at FL230. Emergency descent is made with ATC cooperation. Return land.

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Attributes
ACN	396997
Time
Date	199803
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : iah
State Reference	TX
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 8500
ASRS Report	396997
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Flight departed iah with the left air conditioning pack inoperative. Climbing through FL230 the right pack quit and the cabin began to climb. A descent was requested, and we were cleared initially to 15000 ft, then 10000 ft. The cabin and aircraft arrived at 10000 ft at approximately the same time. With the operation of the right pack in question, we elected to return to iah.

Original NASA ASRS Text

Title: FLC OF MLG DEPARTS WITH 1 AIR CONDITIONING PACK INOP AND THE SECOND PACK FAILS AT FL230. EMER DSCNT IS MADE WITH ATC COOPERATION. RETURN LAND.

Narrative: FLT DEPARTED IAH WITH THE L AIR CONDITIONING PACK INOP. CLBING THROUGH FL230 THE R PACK QUIT AND THE CABIN BEGAN TO CLB. A DSCNT WAS REQUESTED, AND WE WERE CLRED INITIALLY TO 15000 FT, THEN 10000 FT. THE CABIN AND ACFT ARRIVED AT 10000 FT AT APPROX THE SAME TIME. WITH THE OP OF THE R PACK IN QUESTION, WE ELECTED TO RETURN TO IAH.

Data retrieved from NASA's ASRS site as of July 2007 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.