Altitude overshoot near psp, ca. Flight instrument and autoplt malfunctions were the distraction.

Attributes
ACN	468650
Time
Date	200004
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : psp.vortac
State Reference	CA
Altitude	msl bound lower : 12000 msl bound upper : 12500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc tracon : c90.tracon
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude climbout other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 3300 flight time type : 30
ASRS Report	468650
Person 2
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe 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 Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was flying from trm to bur, controller asked me to climb and level off at 12000 ft, I was climbing at 1500 FPM through 11000 ft, engaged autoplt, but my ADI tumbled and autoplt flew through 12000 ft. I had to push nose over aircraft and autoplt, but we already went 12500 ft, less than 30 seconds. We leveled off at 12000 ft, ADI also came back normal. All flight instruments indicated normal. I could not find out what really went wrong, but it could have been prevented if I had scanned instruments more closely.

Original NASA ASRS Text

Title: ALT OVERSHOOT NEAR PSP, CA. FLT INST AND AUTOPLT MALFUNCTIONS WERE THE DISTR.

Narrative: I WAS FLYING FROM TRM TO BUR, CTLR ASKED ME TO CLB AND LEVEL OFF AT 12000 FT, I WAS CLBING AT 1500 FPM THROUGH 11000 FT, ENGAGED AUTOPLT, BUT MY ADI TUMBLED AND AUTOPLT FLEW THROUGH 12000 FT. I HAD TO PUSH NOSE OVER ACFT AND AUTOPLT, BUT WE ALREADY WENT 12500 FT, LESS THAN 30 SECONDS. WE LEVELED OFF AT 12000 FT, ADI ALSO CAME BACK NORMAL. ALL FLT INSTS INDICATED NORMAL. I COULD NOT FIND OUT WHAT REALLY WENT WRONG, BUT IT COULD HAVE BEEN PREVENTED IF I HAD SCANNED INSTS MORE CLOSELY.

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.