IMC conditions. Electrical failure results in long landing and runway excursion.

Attributes
ACN	171212
Time
Date	199102
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : osu
State Reference	OH
Altitude	msl bound lower : 905 msl bound upper : 1605
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cmh tower : osu
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	landing other other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 21 flight time total : 755 flight time type : 21
ASRS Report	171212
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable
Consequence	faa : investigated other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

700-800' above the ground in IMC on an ILS approach I encountered total electrical failure. The plane was set on autoplt on the G/south function. The autoplt shut off and the nose pitched up. I manually tried to trim the lane properly. It felt as if the autoplt locked into place. I emerged out of the clouds at 600' AGL on top of the runway. I decided to try to land on the 5000' runway (9R). I touched down on the later 1/3 and continued past the runway onto the grass by approximately 50'. No damage to the plane or airport reported. The electrical problem is still being investigated. I feel there was a combination of factors that caused me to overshoot the runway. Did not continue descent to MDA of 200' when electrical failure occurred. Improperly trimmed plane, autoplt malfunction. 10-12 KT direct tailwind that caused me to float further down runway. Apparent malfunction of autoplt extremely difficult to control plane. Felt as if autoplt was locked on? Runway was wet, and I was apprehensive on braking too 'hard'.

Original NASA ASRS Text

Title: IMC CONDITIONS. ELECTRICAL FAILURE RESULTS IN LONG LNDG AND RWY EXCURSION.

Narrative: 700-800' ABOVE THE GND IN IMC ON AN ILS APCH I ENCOUNTERED TOTAL ELECTRICAL FAILURE. THE PLANE WAS SET ON AUTOPLT ON THE G/S FUNCTION. THE AUTOPLT SHUT OFF AND THE NOSE PITCHED UP. I MANUALLY TRIED TO TRIM THE LANE PROPERLY. IT FELT AS IF THE AUTOPLT LOCKED INTO PLACE. I EMERGED OUT OF THE CLOUDS AT 600' AGL ON TOP OF THE RWY. I DECIDED TO TRY TO LAND ON THE 5000' RWY (9R). I TOUCHED DOWN ON THE LATER 1/3 AND CONTINUED PAST THE RWY ONTO THE GRASS BY APPROX 50'. NO DAMAGE TO THE PLANE OR ARPT RPTED. THE ELECTRICAL PROB IS STILL BEING INVESTIGATED. I FEEL THERE WAS A COMBINATION OF FACTORS THAT CAUSED ME TO OVERSHOOT THE RWY. DID NOT CONTINUE DSNT TO MDA OF 200' WHEN ELECTRICAL FAILURE OCCURRED. IMPROPERLY TRIMMED PLANE, AUTOPLT MALFUNCTION. 10-12 KT DIRECT TAILWIND THAT CAUSED ME TO FLOAT FURTHER DOWN RWY. APPARENT MALFUNCTION OF AUTOPLT EXTREMELY DIFFICULT TO CTL PLANE. FELT AS IF AUTOPLT WAS LOCKED ON? RWY WAS WET, AND I WAS APPREHENSIVE ON BRAKING TOO 'HARD'.

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.