Instrument pilot trainee overshot final for an ILS approach due to faulty directional gyro. Approach controller noticed the error and gave them a no gyro approach after the instructor advised of the gyro failure.

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Attributes
ACN	506544
Time
Date	200104
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	msl bound lower : 2000 msl bound upper : 3000
Environment
Flight Conditions	IMC
Weather Elements	Ice Thunderstorm
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s46.tracon
Operator	general aviation : instructional
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 91
Navigation In Use	ils localizer & glide slope : 34
Flight Phase	descent : approach
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : multi engine
Experience	flight time last 90 days : 200 flight time total : 800 flight time type : 40
ASRS Report	506544
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : private
Experience	flight time last 90 days : 65 flight time total : 600 flight time type : 300
ASRS Report	506542
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : hsi gyro other controllera
Resolutory Action	controller : provided flight assist controller : issued alert flight crew : returned to intended or assigned course
Consequence	Other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Upon being vectored onto the final approach course for the ILS runway 34L at seatac, we experienced a failure of our heading and on our HSI. We were queried by ATC because we flew well beyond our assigned heading for the vector to final. After a min or two of confusion, my student and I both recognized the problem. I called ATC and notified them of our gyro failure. They gave us a no gyro ILS approach. We broke out about 5 mi from the airport, at which time we continued on the visual for runway 34L. Not sure of anything we could have done better after the situation occurred. There were no indications prior to the failure that I noted to have prevented the situation. I feel our response and corrective action was both timely and appropriate. The failure occurred in the turn for the vector to final. As we were being bumped around quite a bit, I and my student did not notice the card on the HSI had locked up.

Original NASA ASRS Text

Title: INST PLT TRAINEE OVERSHOT FINAL FOR AN ILS APCH DUE TO FAULTY DIRECTIONAL GYRO. APCH CTLR NOTICED THE ERROR AND GAVE THEM A NO GYRO APCH AFTER THE INSTRUCTOR ADVISED OF THE GYRO FAILURE.

Narrative: UPON BEING VECTORED ONTO THE FINAL APCH COURSE FOR THE ILS RWY 34L AT SEATAC, WE EXPERIENCED A FAILURE OF OUR HDG AND ON OUR HSI. WE WERE QUERIED BY ATC BECAUSE WE FLEW WELL BEYOND OUR ASSIGNED HDG FOR THE VECTOR TO FINAL. AFTER A MIN OR TWO OF CONFUSION, MY STUDENT AND I BOTH RECOGNIZED THE PROB. I CALLED ATC AND NOTIFIED THEM OF OUR GYRO FAILURE. THEY GAVE US A NO GYRO ILS APCH. WE BROKE OUT ABOUT 5 MI FROM THE ARPT, AT WHICH TIME WE CONTINUED ON THE VISUAL FOR RWY 34L. NOT SURE OF ANYTHING WE COULD HAVE DONE BETTER AFTER THE SIT OCCURRED. THERE WERE NO INDICATIONS PRIOR TO THE FAILURE THAT I NOTED TO HAVE PREVENTED THE SIT. I FEEL OUR RESPONSE AND CORRECTIVE ACTION WAS BOTH TIMELY AND APPROPRIATE. THE FAILURE OCCURRED IN THE TURN FOR THE VECTOR TO FINAL. AS WE WERE BEING BUMPED AROUND QUITE A BIT, I AND MY STUDENT DID NOT NOTICE THE CARD ON THE HSI HAD LOCKED UP.

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.