Altitude overshoot with FMS.

Attributes
ACN	470290
Time
Date	200004
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sua.airport
State Reference	FL
Altitude	msl bound lower : 9000 msl bound upper : 9500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Experience	flight time total : 11000
ASRS Report	470290
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Climbing out from sua, we were cleared to 9000 ft. The autoplt and altitude select were on and I believe were properly set. The autoplt failed to capture and we overshot the altitude by approximately 500 ft before we could stop the climb. I believe either I or the copilot inadvertently hit the trim button on the yoke and disconnected the altitude select mode. Lesson learned: don't blindly assume the autoplt will work! We get complacent and too confident in our automatic system. There is no substitute for good old basic flying techniques.

Original NASA ASRS Text

Title: ALT OVERSHOOT WITH FMS.

Narrative: CLBING OUT FROM SUA, WE WERE CLRED TO 9000 FT. THE AUTOPLT AND ALT SELECT WERE ON AND I BELIEVE WERE PROPERLY SET. THE AUTOPLT FAILED TO CAPTURE AND WE OVERSHOT THE ALT BY APPROX 500 FT BEFORE WE COULD STOP THE CLB. I BELIEVE EITHER I OR THE COPLT INADVERTENTLY HIT THE TRIM BUTTON ON THE YOKE AND DISCONNECTED THE ALT SELECT MODE. LESSON LEARNED: DON'T BLINDLY ASSUME THE AUTOPLT WILL WORK! WE GET COMPLACENT AND TOO CONFIDENT IN OUR AUTOMATIC SYS. THERE IS NO SUBSTITUTE FOR GOOD OLD BASIC FLYING TECHNIQUES.

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.