Emergency declared emergency descent.

Attributes
ACN	295889
Time
Date	199502
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : slt
State Reference	PA
Altitude	msl bound lower : 24000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny tower : san
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 10500 flight time type : 70
ASRS Report	295889
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 none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

After leveling at 330 ft, we noticed the cabin rate fluctuating plus and minus 200 ft and a cabin altitude of approximately 9500 ft. Requested lower altitude (29000 ft, then 24000 ft) and initiated descent. We tried to lower/control cabin altitude but were unable to. As we started down, the #1 air conditioning pack faulted and cabin rate started to climb at 500 ft FPM. We requested continued descent and declared and emergency. At no time did the cabin altitude climb above approximately 13000 ft. During descent all emergency and normal procedures were followed. Flight was diverted to lga where we landed without further incident.

Original NASA ASRS Text

Title: EMER DECLARED EMER DSCNT.

Narrative: AFTER LEVELING AT 330 FT, WE NOTICED THE CABIN RATE FLUCTUATING PLUS AND MINUS 200 FT AND A CABIN ALT OF APPROX 9500 FT. REQUESTED LOWER ALT (29000 FT, THEN 24000 FT) AND INITIATED DSCNT. WE TRIED TO LOWER/CONTROL CABIN ALT BUT WERE UNABLE TO. AS WE STARTED DOWN, THE #1 AIR CONDITIONING PACK FAULTED AND CABIN RATE STARTED TO CLB AT 500 FT FPM. WE REQUESTED CONTINUED DSCNT AND DECLARED AND EMER. AT NO TIME DID THE CABIN ALT CLB ABOVE APPROX 13000 FT. DURING DSCNT ALL EMER AND NORMAL PROCS WERE FOLLOWED. FLT WAS DIVERTED TO LGA WHERE WE LANDED WITHOUT FURTHER INCIDENT.

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.