First officer of a canadair regional jet, CL65, overshot assigned altitude on departure due to an altimeter error setting by the aircraft air data computer. The flight crew compared altimeter readings and corrected back to the correct altitude.

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Attributes
ACN	384433
Time
Date	199710
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 8000 msl bound upper : 8400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : phl
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : cvg
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 60 flight time total : 8000 flight time type : 60
ASRS Report	384433
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 4500 flight time type : 350
ASRS Report	384580
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

First officer flying. Flight data computer reset altimeters on first officer's side during takeoff roll. We were given a leveloff altitude of 8000 ft. Caught altitude discrepancy at 8000 ft and leveled off at 8400 ft. No traffic conflict. Right side flight data computer had been giving us trouble during engine starts during the day.

Original NASA ASRS Text

Title: FO OF A CANADAIR REGIONAL JET, CL65, OVERSHOT ASSIGNED ALT ON DEP DUE TO AN ALTIMETER ERROR SETTING BY THE ACFT AIR DATA COMPUTER. THE FLC COMPARED ALTIMETER READINGS AND CORRECTED BACK TO THE CORRECT ALT.

Narrative: FO FLYING. FLT DATA COMPUTER RESET ALTIMETERS ON FO'S SIDE DURING TKOF ROLL. WE WERE GIVEN A LEVELOFF ALT OF 8000 FT. CAUGHT ALT DISCREPANCY AT 8000 FT AND LEVELED OFF AT 8400 FT. NO TFC CONFLICT. R SIDE FLT DATA COMPUTER HAD BEEN GIVING US TROUBLE DURING ENG STARTS DURING THE DAY.

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.