Loss of pressurization.

Attributes
ACN	292277
Time
Date	199412
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : acy
State Reference	NJ
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
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 : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 2000
ASRS Report	292277
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	other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cabin pressurization flow light illuminated (intermittently) during climb out and cruise (FL240). Cabin altitude was above schedule (6500 ft) at FL240. Flight was being conducted with 1 pack inoperative due to MEL placard that was initiated for this segment. Reason was right pack pressure could not be isolated from engine bleed air (possible faulty pressure regulator valve). After 14 min into flight, the cabin altitude started rising rapidly and before ATC could clear us for lower altitude (10000 ft) the cabin altitude light illuminated. The descent profile was being conducted at this time and mask deployment in main cabin was prevented. Captain went on supplemental oxygen as preventative measure until aircraft reached 10000 ft. Flight attendants were briefed along with first officer for high speed, over weight landing and possible hot brakes or fire after landing. Emergency vehicles were requested for possible brake fire. Approach, landing and taxi were accomplished without incident. No complaints from passenger were noted. No emergency was declared.

Original NASA ASRS Text

Title: LOSS OF PRESSURIZATION.

Narrative: CABIN PRESSURIZATION FLOW LIGHT ILLUMINATED (INTERMITTENTLY) DURING CLBOUT AND CRUISE (FL240). CABIN ALT WAS ABOVE SCHEDULE (6500 FT) AT FL240. FLT WAS BEING CONDUCTED WITH 1 PACK INOP DUE TO MEL PLACARD THAT WAS INITIATED FOR THIS SEGMENT. REASON WAS RIGHT PACK PRESSURE COULD NOT BE ISOLATED FROM ENG BLEED AIR (POSSIBLE FAULTY PRESSURE REGULATOR VALVE). AFTER 14 MIN INTO FLT, THE CABIN ALT STARTED RISING RAPIDLY AND BEFORE ATC COULD CLR US FOR LOWER ALT (10000 FT) THE CABIN ALT LIGHT ILLUMINATED. THE DSCNT PROFILE WAS BEING CONDUCTED AT THIS TIME AND MASK DEPLOYMENT IN MAIN CABIN WAS PREVENTED. CAPT WENT ON SUPPLEMENTAL OXYGEN AS PREVENTATIVE MEASURE UNTIL ACFT REACHED 10000 FT. FLT ATTENDANTS WERE BRIEFED ALONG WITH FO FOR HIGH SPD, OVER WT LNDG AND POSSIBLE HOT BRAKES OR FIRE AFTER LNDG. EMER VEHICLES WERE REQUESTED FOR POSSIBLE BRAKE FIRE. APCH, LNDG AND TAXI WERE ACCOMPLISHED WITHOUT INCIDENT. NO COMPLAINTS FROM PAX WERE NOTED. NO EMER WAS DECLARED.

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.