Flight crew of a B727 had to make an emergency descent after losing cabin pressurization due to loss of the left bleed air pack. A diversion to land was necessary since no corrective action would hold aircraft pressurization.

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Attributes
ACN	361278
Time
Date	199702
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : jax airport : zjx
State Reference	FL
Altitude	msl bound lower : 6000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx tracon : jax
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors enroute airway : zjx
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12000 flight time type : 1000
ASRS Report	361278
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:

On climb out at 6000 ft, experienced #1 strut overheat. Procedures followed. #1 bleed valve closed, left pack off, and forward outflow valve closed. Light went out. Advised dispatch and maintenance control. Continued for normal destination. Climbed to FL290. Observed cabin altitude climbing past 7000 ft. Initiated descent, looking for altitude that would hold cabin. Cabin kept climbing, eventually reaching 10500 ft. Continued rapid descent with assistance of ZJX. Leveled at 9000 ft. Conferred with company and diverted to atl for maintenance.

Original NASA ASRS Text

Title: FLC OF A B727 HAD TO MAKE AN EMER DSCNT AFTER LOSING CABIN PRESSURIZATION DUE TO LOSS OF THE L BLEED AIR PACK. A DIVERSION TO LAND WAS NECESSARY SINCE NO CORRECTIVE ACTION WOULD HOLD ACFT PRESSURIZATION.

Narrative: ON CLB OUT AT 6000 FT, EXPERIENCED #1 STRUT OVERHEAT. PROCS FOLLOWED. #1 BLEED VALVE CLOSED, L PACK OFF, AND FORWARD OUTFLOW VALVE CLOSED. LIGHT WENT OUT. ADVISED DISPATCH AND MAINT CTL. CONTINUED FOR NORMAL DEST. CLBED TO FL290. OBSERVED CABIN ALT CLBING PAST 7000 FT. INITIATED DSCNT, LOOKING FOR ALT THAT WOULD HOLD CABIN. CABIN KEPT CLBING, EVENTUALLY REACHING 10500 FT. CONTINUED RAPID DSCNT WITH ASSISTANCE OF ZJX. LEVELED AT 9000 FT. CONFERRED WITH COMPANY AND DIVERTED TO ATL FOR MAINT.

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.