A BE36 on an ILS approach with the horizontal situation indicator centered the autoplt had airplane 1 mi east of course. Approach control verified airplane was 1 mi east.

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Attributes
ACN	696205
Time
Date	200605
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : rfd.tracon
Operator	general aviation : instructional
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 01
Flight Phase	descent : approach
Route In Use	approach : instrument precision arrival : on vectors
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor
Qualification	pilot : multi engine pilot : cfi pilot : atp
Experience	flight time last 90 days : 140 flight time total : 26790 flight time type : 1490
ASRS Report	696205
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	aircraft equipment problem : critical other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : hsi indicator other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist flight crew : returned to intended or assigned course
Consequence	other
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

On a practice ILS approach to runway 1; we were vectored to an ILS runway 1 approach. The private pilot had tuned in and idented the localizer; and placed the inbound course correctly in the HSI. The autoplt was on in the heading and altitude mode. Approach control gave us a heading to intercept the course; an altitude to maintain until established; and cleared for an ILS runway 1 approach. As the HSI centered; the autoplt went to the coupled mode. Everything was done correctly. However; the autoplt had us 1 mi east of course with the localizer centered on GS. Approach control was aware and asked us if we had the approach set up. We informed him we did and could tell we were east of the localizer and would correct. We tuned on the #2 navigation and confirmed we were east of course. We had the HSI in the navigation/ILS mode and not GPS. The aircraft went into a radio shop to work out why it showed us on course when we were not. It showed the error once and then could not duplicate the problem again. This aircraft is equipped with a navcom; HSI and 3-AXIS autoplt.

Original NASA ASRS Text

Title: A BE36 ON AN ILS APCH WITH THE HORIZ SITUATION INDICATOR CTRED THE AUTOPLT HAD AIRPLANE 1 MI E OF COURSE. APCH CTL VERIFIED AIRPLANE WAS 1 MI E.

Narrative: ON A PRACTICE ILS APCH TO RWY 1; WE WERE VECTORED TO AN ILS RWY 1 APCH. THE PVT PLT HAD TUNED IN AND IDENTED THE LOC; AND PLACED THE INBOUND COURSE CORRECTLY IN THE HSI. THE AUTOPLT WAS ON IN THE HDG AND ALT MODE. APCH CTL GAVE US A HDG TO INTERCEPT THE COURSE; AN ALT TO MAINTAIN UNTIL ESTABLISHED; AND CLRED FOR AN ILS RWY 1 APCH. AS THE HSI CTRED; THE AUTOPLT WENT TO THE COUPLED MODE. EVERYTHING WAS DONE CORRECTLY. HOWEVER; THE AUTOPLT HAD US 1 MI E OF COURSE WITH THE LOC CTRED ON GS. APCH CTL WAS AWARE AND ASKED US IF WE HAD THE APCH SET UP. WE INFORMED HIM WE DID AND COULD TELL WE WERE E OF THE LOC AND WOULD CORRECT. WE TUNED ON THE #2 NAV AND CONFIRMED WE WERE E OF COURSE. WE HAD THE HSI IN THE NAV/ILS MODE AND NOT GPS. THE ACFT WENT INTO A RADIO SHOP TO WORK OUT WHY IT SHOWED US ON COURSE WHEN WE WERE NOT. IT SHOWED THE ERROR ONCE AND THEN COULD NOT DUPLICATE THE PROB AGAIN. THIS ACFT IS EQUIPPED WITH A NAVCOM; HSI AND 3-AXIS AUTOPLT.

Data retrieved from NASA's ASRS site as of January 2009 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.