Altitude deviation altitude overshot.

Attributes
ACN	186051
Time
Date	199108
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dtw
State Reference	MI
Altitude	msl bound lower : 4000 msl bound upper : 4500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air taxi
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 94 flight time total : 4800 flight time type : 160
ASRS Report	186051
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Aircraft was climbing to assigned altitude of 4000 ft, when at approximately 3200 ft the pilot's attitude indicator's information commenced showing a right bank. When checked against the directional gyroscope after a wings level attitude was acquired, the directional gyroscope showed a left turn had commenced. While cross scanning the other instruments to stabilize the aircraft the altitude was checked showing 4400 ft. The aircraft achieved 4500 ft before an immediate descent was commenced back to the assigned altitude of 4000 ft. No comment or report was made by ATC on the incident, evidently it was not noticed.

Original NASA ASRS Text

Title: ALT DEVIATION ALT OVERSHOT.

Narrative: ACFT WAS CLBING TO ASSIGNED ALT OF 4000 FT, WHEN AT APPROX 3200 FT THE PLT'S ATTITUDE INDICATOR'S INFO COMMENCED SHOWING A R BANK. WHEN CHKED AGAINST THE DIRECTIONAL GYROSCOPE AFTER A WINGS LEVEL ATTITUDE WAS ACQUIRED, THE DIRECTIONAL GYROSCOPE SHOWED A L TURN HAD COMMENCED. WHILE CROSS SCANNING THE OTHER INSTS TO STABILIZE THE ACFT THE ALT WAS CHKED SHOWING 4400 FT. THE ACFT ACHIEVED 4500 FT BEFORE AN IMMEDIATE DSCNT WAS COMMENCED BACK TO THE ASSIGNED ALT OF 4000 FT. NO COMMENT OR RPT WAS MADE BY ATC ON THE INCIDENT, EVIDENTLY IT WAS NOT NOTICED.

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.