This B727 air carrier flight crew lost their pressurization while troubleshooting a temperature regulation problem with the air conditioning and pressurization system. The flight crew recovered normal operation and continued to their destination at a reduced altitude.

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Attributes
ACN	351983
Time
Date	199611
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bce
State Reference	UT
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 580
ASRS Report	351983
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 3000
ASRS Report	351986
Events
Anomaly	aircraft equipment problem : critical aircraft equipment problem : less severe non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Incident started with so declaring she was unable to get left mix value to move from full cold. Several mins later the altitude (cabin) warning horn sounded. I immediately donned my oxygen mask. I verified with the captain that the cabin was climbing and that a descent was required. He advised ATC of our problem and requested an immediate descent. We were cleared initially to 15000 ft MSL with subsequent clearance to 11500 ft MSL. I flew the rapid descent profile and communicated with ATC. The captain worked the emergency procedure with the so. He also briefed flight attendant and communicated with the company. A short time after leveling at 11500 ft, cabin pressurization was regained. We initially climbed to 15000 ft MSL. While considering a divert field. Cabin pressurization appeared to be operating normally at this time so we climbed to FL230. Cabin pressurization continued to operate normally so we requested a redispatch and continued to msp at FL230. On descent into msp, the left pack overheat light illuminated, but no pressurization problems were encountered.

Original NASA ASRS Text

Title: THIS B727 ACR FLC LOST THEIR PRESSURIZATION WHILE TROUBLESHOOTING A TEMP REG PROB WITH THE AIR CONDITIONING AND PRESSURIZATION SYS. THE FLC RECOVERED NORMAL OP AND CONTINUED TO THEIR DEST AT A REDUCED ALT.

Narrative: INCIDENT STARTED WITH SO DECLARING SHE WAS UNABLE TO GET L MIX VALUE TO MOVE FROM FULL COLD. SEVERAL MINS LATER THE ALT (CABIN) WARNING HORN SOUNDED. I IMMEDIATELY DONNED MY OXYGEN MASK. I VERIFIED WITH THE CAPT THAT THE CABIN WAS CLBING AND THAT A DSCNT WAS REQUIRED. HE ADVISED ATC OF OUR PROB AND REQUESTED AN IMMEDIATE DSCNT. WE WERE CLRED INITIALLY TO 15000 FT MSL WITH SUBSEQUENT CLRNC TO 11500 FT MSL. I FLEW THE RAPID DSCNT PROFILE AND COMMUNICATED WITH ATC. THE CAPT WORKED THE EMER PROC WITH THE SO. HE ALSO BRIEFED FLT ATTENDANT AND COMMUNICATED WITH THE COMPANY. A SHORT TIME AFTER LEVELING AT 11500 FT, CABIN PRESSURIZATION WAS REGAINED. WE INITIALLY CLBED TO 15000 FT MSL. WHILE CONSIDERING A DIVERT FIELD. CABIN PRESSURIZATION APPEARED TO BE OPERATING NORMALLY AT THIS TIME SO WE CLBED TO FL230. CABIN PRESSURIZATION CONTINUED TO OPERATE NORMALLY SO WE REQUESTED A REDISPATCH AND CONTINUED TO MSP AT FL230. ON DSCNT INTO MSP, THE L PACK OVERHEAT LIGHT ILLUMINATED, BUT NO PRESSURIZATION PROBS WERE ENCOUNTERED.

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.