An air carrier F100 flight crew had to divert land because of an aircraft equipment problem avionics cooling valve that caused a loss of pressurization. Emergency declared.

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Attributes
ACN	339322
Time
Date	199606
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 0 msl bound upper : 29000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : preflight other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	339322
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 taxi out at ord, got an avionics cool valve message on the MFDU. Unable to correct. Returned to gate. We shut down engines, it went away. Maintenance had us start late. At FL290 had a pressurization problem and lost the cabin. Emergency descent into sdf. Uneventful landing. We had declared an emergency but no crash fire rescue equipment. Nobody was hurt. Called air carrier maintenance and they said problem was from that avionics valve they had placarded in ord.

Original NASA ASRS Text

Title: AN ACR F100 FLC HAD TO DIVERT LAND BECAUSE OF AN ACFT EQUIP PROB AVIONICS COOLING VALVE THAT CAUSED A LOSS OF PRESSURIZATION. EMER DECLARED.

Narrative: ON TAXI OUT AT ORD, GOT AN AVIONICS COOL VALVE MESSAGE ON THE MFDU. UNABLE TO CORRECT. RETURNED TO GATE. WE SHUT DOWN ENGS, IT WENT AWAY. MAINT HAD US START LATE. AT FL290 HAD A PRESSURIZATION PROB AND LOST THE CABIN. EMER DSCNT INTO SDF. UNEVENTFUL LNDG. WE HAD DECLARED AN EMER BUT NO CFR. NOBODY WAS HURT. CALLED ACR MAINT AND THEY SAID PROB WAS FROM THAT AVIONICS VALVE THEY HAD PLACARDED IN ORD.

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.