A B737-500 flight loses the ability to maintain cabin pressure at FL280. After QRH use and a requested descent to 10000 ft the cabin holds assigned level of pressure.

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Attributes
ACN	617899
Time
Date	200405
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zhu.artcc
State Reference	TX
Altitude	msl single value : 28000
Environment
Flight Conditions	IMC
Weather Elements	Windshear Rain Thunderstorm
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zhu.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude descent : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 23000 flight time type : 15000
ASRS Report	617899
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : bleed trip lite other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

In holding pattern at 28000 ft, bleed trip off light came on, right side. Followed QRH procedure. Light went out, proceeded normally. Approximately 15 mins later, altitude warning horn came on. Cabin pressure was above 10000 ft and climbing at 500 FPM. QRH items accomplished and cabin continued to climb at 500 FPM. At 13000 ft cabin altitude, we requested to descend to 10000 ft. The cabin pressure started to stabilize coming down through 18000 ft. At 10000 ft aircraft held normal pressure. Vectors to normal approach and landing.

Original NASA ASRS Text

Title: A B737-500 FLT LOSES THE ABILITY TO MAINTAIN CABIN PRESSURE AT FL280. AFTER QRH USE AND A REQUESTED DSCNT TO 10000 FT THE CABIN HOLDS ASSIGNED LEVEL OF PRESSURE.

Narrative: IN HOLDING PATTERN AT 28000 FT, BLEED TRIP OFF LIGHT CAME ON, R SIDE. FOLLOWED QRH PROC. LIGHT WENT OUT, PROCEEDED NORMALLY. APPROX 15 MINS LATER, ALT WARNING HORN CAME ON. CABIN PRESSURE WAS ABOVE 10000 FT AND CLBING AT 500 FPM. QRH ITEMS ACCOMPLISHED AND CABIN CONTINUED TO CLB AT 500 FPM. AT 13000 FT CABIN ALT, WE REQUESTED TO DSND TO 10000 FT. THE CABIN PRESSURE STARTED TO STABILIZE COMING DOWN THROUGH 18000 FT. AT 10000 FT ACFT HELD NORMAL PRESSURE. VECTORS TO NORMAL APCH AND LNDG.

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.