Small aircraft pilot loses control of aircraft as it veers off approach courses on ILS with autoplt coupled. Heading track deviation.

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Attributes
ACN	157433
Time
Date	199009
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : toa
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : sna tower : sna
Operator	general aviation : corporate
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 460 flight time type : 225
ASRS Report	157433
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance other anomaly other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : overcame equipment problem
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Was on final ILS course prior to OM. New plane first time flown, and new autoplt system which malfunctioned. It made a right turn of 180 degrees off course in marginal to IMC WX, happened quickly in IMC. Torrance tower asked if I was unfamiliar with area and was advised to remain VMC while on IFR flight plan. Did a 360 degree turn back onto final approach. Could not disengage autoplt until after 180 degree turn made, but then landed runway 29R. Am having aircraft svced to fix problem.

Original NASA ASRS Text

Title: SMA PLT LOSES CTL OF ACFT AS IT VEERS OFF APCH COURSES ON ILS WITH AUTOPLT COUPLED. HEADING TRACK DEVIATION.

Narrative: WAS ON FINAL ILS COURSE PRIOR TO OM. NEW PLANE FIRST TIME FLOWN, AND NEW AUTOPLT SYS WHICH MALFUNCTIONED. IT MADE A RIGHT TURN OF 180 DEGS OFF COURSE IN MARGINAL TO IMC WX, HAPPENED QUICKLY IN IMC. TORRANCE TWR ASKED IF I WAS UNFAMILIAR WITH AREA AND WAS ADVISED TO REMAIN VMC WHILE ON IFR FLT PLAN. DID A 360 DEG TURN BACK ONTO FINAL APCH. COULD NOT DISENGAGE AUTOPLT UNTIL AFTER 180 DEG TURN MADE, BUT THEN LANDED RWY 29R. AM HAVING ACFT SVCED TO FIX PROB.

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.