MD83 crew experienced a pack overheat malfunction and subsequent loss of pressurization on climb out...

Attributes
ACN	687748
Time
Date	200602
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzzz.airport
State Reference	FO
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzzz.artcc
Operator	common carrier : air carrier
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	687748
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	688046
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport flight crew : landed as precaution flight crew : declared emergency other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During climb approximately ambients after takeoff; the #1 flight attendant called to say it was cold in the forward cabin. The first officer adjusted the temperature controllers slightly warmer. Approximately 3 mins the #2 flight attendant called and said it was very warm in the back. The first officer readjusted the temperature controllers cooler; then checked the supply temperature. The supply temperature was pegged at 150 degrees. Next the first officer noticed the right pack pressure gauge was reading 0 psi. The left pack pressure gauge was reading about 28 psi. The cabin altitude was climbing at about 1500 FPM and the cabin was now passing through 10000 ft. We immediately completed the red box procedures for cabin altitude warning/rapid depressurization; called ATC and told them we needed an immediate descent to 14000 ft. Now the left pack pressure gauge was reading less than 10 psi. We initiated the emergency descent and completed the cabin altitude warning/rapid depressurization checklist and the emergency descent checklist and turned back during the descent. We leveled off at 14000 ft. At this time both the left and the right packs came back on and restored cabin pressurization to normal. We continued back at 14000 ft and landed uneventfully.

Original NASA ASRS Text

Title: MD83 CREW EXPERIENCED A PACK OVERHEAT MALFUNCTION AND SUBSEQUENT LOSS OF PRESSURIZATION ON CLBOUT.

Narrative: DURING CLB APPROX AMBIENTS AFTER TKOF; THE #1 FLT ATTENDANT CALLED TO SAY IT WAS COLD IN THE FORWARD CABIN. THE FO ADJUSTED THE TEMP CONTROLLERS SLIGHTLY WARMER. APPROX 3 MINS THE #2 FLT ATTENDANT CALLED AND SAID IT WAS VERY WARM IN THE BACK. THE FO READJUSTED THE TEMP CONTROLLERS COOLER; THEN CHKED THE SUPPLY TEMP. THE SUPPLY TEMP WAS PEGGED AT 150 DEGS. NEXT THE FO NOTICED THE R PACK PRESSURE GAUGE WAS READING 0 PSI. THE L PACK PRESSURE GAUGE WAS READING ABOUT 28 PSI. THE CABIN ALT WAS CLBING AT ABOUT 1500 FPM AND THE CABIN WAS NOW PASSING THROUGH 10000 FT. WE IMMEDIATELY COMPLETED THE RED BOX PROCS FOR CABIN ALT WARNING/RAPID DEPRESSURIZATION; CALLED ATC AND TOLD THEM WE NEEDED AN IMMEDIATE DSCNT TO 14000 FT. NOW THE L PACK PRESSURE GAUGE WAS READING LESS THAN 10 PSI. WE INITIATED THE EMER DSCNT AND COMPLETED THE CABIN ALT WARNING/RAPID DEPRESSURIZATION CHKLIST AND THE EMER DSCNT CHKLIST AND TURNED BACK DURING THE DSCNT. WE LEVELED OFF AT 14000 FT. AT THIS TIME BOTH THE L AND THE R PACKS CAME BACK ON AND RESTORED CABIN PRESSURIZATION TO NORMAL. WE CONTINUED BACK AT 14000 FT AND LANDED UNEVENTFULLY.

Data retrieved from NASA's ASRS site as of January 2009 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.