DC9 flight crew has inoperative pack on departure then has second pack shut down. Emergency descent.

Attributes
ACN	327456
Time
Date	199602
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bae
State Reference	WI
Altitude	msl bound lower : 8000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zmp
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 9000 flight time type : 800
ASRS Report	327456
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
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
Air Traffic Incident	other

Narrative:

We were dispatched with 1 air-conditioning pack inoperative. At FL240, and stabilized, the other pack shut itself down temporarily, enough that cabin started to climb at maximum rate. Got clearance for and descended rapidly, no emergency, to 8000 ft MSL. Barely in time to prevent masks from dropping. Wrote up aircraft.

Original NASA ASRS Text

Title: DC9 FLC HAS INOP PACK ON DEP THEN HAS SECOND PACK SHUT DOWN. EMER DSCNT.

Narrative: WE WERE DISPATCHED WITH 1 AIR-CONDITIONING PACK INOP. AT FL240, AND STABILIZED, THE OTHER PACK SHUT ITSELF DOWN TEMPORARILY, ENOUGH THAT CABIN STARTED TO CLB AT MAX RATE. GOT CLRNC FOR AND DSNDED RAPIDLY, NO EMER, TO 8000 FT MSL. BARELY IN TIME TO PREVENT MASKS FROM DROPPING. WROTE UP ACFT.

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.