Light transport altitude deviation near msp.

Attributes
ACN	444620
Time
Date	199907
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : mcw.vortac
State Reference	IA
Altitude	msl single value : 26000
Environment
Flight Conditions	Mixed
Weather Elements	Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp.artcc tower : btv.tower
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 91
Navigation In Use	other other vortac
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 50 flight time total : 3550 flight time type : 700
ASRS Report	444620
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : far
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

During a deviation around a line of thunderstorms, the autoplt drifted above the set altitude. Upon disconnect, the airplane pitched up due to heavy nose up trim force. The airplane was returned to assigned altitude and retrimmed.

Original NASA ASRS Text

Title: LTT ALTDEV NEAR MSP.

Narrative: DURING A DEV AROUND A LINE OF TSTMS, THE AUTOPLT DRIFTED ABOVE THE SET ALT. UPON DISCONNECT, THE AIRPLANE PITCHED UP DUE TO HVY NOSE UP TRIM FORCE. THE AIRPLANE WAS RETURNED TO ASSIGNED ALT AND RETRIMMED.

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.