Flight crew of large transport at FL280 had cabin altitude rise. Captain flying made emergency descent to 14000' MSL. Diverted to bna account trw dfw area. On approach to landing had another altitude rise because of 1 air conditioning pack inoperative.

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Attributes
ACN	175399
Time
Date	199104
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sat airport : bna
State Reference	TX
Altitude	msl bound lower : 14000 msl bound upper : 28000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zhu
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other other
Route In Use	enroute airway : zhu
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 210
ASRS Report	174399
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
ASRS Report	175588
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : regained aircraft control flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

The F/east announced that the cabin altitude was at 10000', just as the altitude (cabin) warning horn went off. An emergency descent was initiated and simultaneously ATC was advised we needed 14000'. I believe we received clearance to 14000' as we were descending through 26000'. We initiated the descent per company procedure.

Original NASA ASRS Text

Title: FLT CREW OF LGT AT FL280 HAD CABIN ALT RISE. CAPT FLYING MADE EMERGENCY DESCENT TO 14000' MSL. DIVERTED TO BNA ACCOUNT TRW DFW AREA. ON APCH TO LNDG HAD ANOTHER ALT RISE BECAUSE OF 1 AIR CONDITIONING PACK INOPERATIVE.

Narrative: THE F/E ANNOUNCED THAT THE CABIN ALT WAS AT 10000', JUST AS THE ALT (CABIN) WARNING HORN WENT OFF. AN EMER DSNT WAS INITIATED AND SIMULTANEOUSLY ATC WAS ADVISED WE NEEDED 14000'. I BELIEVE WE RECEIVED CLRNC TO 14000' AS WE WERE DSNDING THROUGH 26000'. WE INITIATED THE DSNT PER COMPANY PROC.

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.