FK100 executes emergency descent after losing pressurization system in ZOB airspace.

Attributes
ACN	415281
Time
Date	199809
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : fnt
State Reference	MI
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other descent other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	415281
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : exited adverse environment other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Cruise flight at FL350. We had a recurring pack 1 fault and pack 1 was shut off per procedure. Shortly thereafter, we had a pack 2 fault. An emergency descent was initiated and an emergency was declared with ZOB. After leveling at 10000 ft, pack 2 was able to be reinstated as per procedure. We canceled the emergency with ZOB and climbed to FL200 to finish the flight to ord after taking fuel burn at the lower altitude into consideration and checking with dispatch. The cabin pressure never exceeded 9000 ft. I made a PA concerning the descent, but I believe the entire event went pretty much unnoticed by the passenger.

Original NASA ASRS Text

Title: FK100 EXECUTES EMER DSCNT AFTER LOSING PRESSURIZATION SYS IN ZOB AIRSPACE.

Narrative: CRUISE FLT AT FL350. WE HAD A RECURRING PACK 1 FAULT AND PACK 1 WAS SHUT OFF PER PROC. SHORTLY THEREAFTER, WE HAD A PACK 2 FAULT. AN EMER DSCNT WAS INITIATED AND AN EMER WAS DECLARED WITH ZOB. AFTER LEVELING AT 10000 FT, PACK 2 WAS ABLE TO BE REINSTATED AS PER PROC. WE CANCELED THE EMER WITH ZOB AND CLBED TO FL200 TO FINISH THE FLT TO ORD AFTER TAKING FUEL BURN AT THE LOWER ALT INTO CONSIDERATION AND CHKING WITH DISPATCH. THE CABIN PRESSURE NEVER EXCEEDED 9000 FT. I MADE A PA CONCERNING THE DSCNT, BUT I BELIEVE THE ENTIRE EVENT WENT PRETTY MUCH UNNOTICED BY THE PAX.

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.