FK100 aircraft had ground air mode fault and cabin started climbing rapidly. Flight crew requested lower altitude and were assigned 17000 ft. Flight crew forgot to reset altimeter leaving FL180 and were 400 ft low at 17000 ft. ATC intervened, flight crew discovered error and returned to assigned.

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Attributes
ACN	357202
Time
Date	199701
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : msp
State Reference	MN
Altitude	msl bound lower : 16600 msl bound upper : 17000
Aircraft 1
Controlling Facilities	artcc : zmp
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
Route In Use	enroute airway : zmp
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	357202
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	357203
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : published procedure non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : declared emergency flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Location: 80 mi south of msp. Climbing through FL220 cabin started a high rate of climb. We requested lower and were cleared down to 17000 ft. As we began our descent a takeoff trim warning came on MFDU and an aural alert also. Leveled at 17000 ft. ATC advised to check altitude. Forgot to reset altimeters passing FL180. After resetting altimeters we were 400 ft low. Climbed back to 17000 ft.

Original NASA ASRS Text

Title: FK100 ACFT HAD GND AIR MODE FAULT AND CABIN STARTED CLBING RAPIDLY. FLC REQUESTED LOWER ALT AND WERE ASSIGNED 17000 FT. FLC FORGOT TO RESET ALTIMETER LEAVING FL180 AND WERE 400 FT LOW AT 17000 FT. ATC INTERVENED, FLC DISCOVERED ERROR AND RETURNED TO ASSIGNED.

Narrative: LOCATION: 80 MI S OF MSP. CLBING THROUGH FL220 CABIN STARTED A HIGH RATE OF CLB. WE REQUESTED LOWER AND WERE CLRED DOWN TO 17000 FT. AS WE BEGAN OUR DSCNT A TKOF TRIM WARNING CAME ON MFDU AND AN AURAL ALERT ALSO. LEVELED AT 17000 FT. ATC ADVISED TO CHK ALT. FORGOT TO RESET ALTIMETERS PASSING FL180. AFTER RESETTING ALTIMETERS WE WERE 400 FT LOW. CLBED BACK TO 17000 FT.

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.