|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : iiu|
|Altitude||msl bound lower : 7000|
msl bound upper : 7000
|Operator||general aviation : personal|
|Make Model Name||Small Aircraft, Low Wing, 1 Eng, Retractable Gear|
|Flight Phase||cruise other|
|Route In Use||enroute airway : v51|
|Function||flight crew : single pilot|
|Qualification||pilot : instrument|
pilot : private
|Experience||flight time last 90 days : 40|
flight time total : 2000
flight time type : 1500
|Affiliation||government : faa|
|Function||controller : radar|
|Qualification||controller : radar|
|Anomaly||aircraft equipment problem : critical|
|Independent Detector||other flight crewa|
|Resolutory Action||flight crew : declared emergency|
none taken : anomaly accepted
|Air Traffic Incident||other|
On IFR flight on 10/fri/91 from gyy to pdk, I lost the alternator about 60 NM south of louisville on V51. I saw the ammeter indicator move to the 'discharge' side, so I felt confident I had a full battery charge. I advised ATC of the problem and got permission to leave the frequency and to turn off the transponder. I turned off all the avionics and other uses of battery power, tried all circuit breakers, etc, but could not restore alternator charging. I then turned on 1 radio and the DME, contacted ATC and obtained permission to go off the air again. This was repeated 2 or 3 times to give position reports, and I arrived at pdk with ample battery reserve for communications navigation, lowering the gear and flaps. The problem turned out to be a malfunctioning voltage regulator, which was replaced at pdk.
Original NASA ASRS Text
Title: GA SMA LOST ALTERNATOR 60 S OF IIU ENRTE TO PDK. PLT CUT ELECTRICAL LOAD AND THROUGH COORD WITH ARTCC WAS ABLE TO CONTINUE TO DEST WITH SUFFICIENT ELECTRICAL PWR TO MAKE A NORMAL APCH AND LNDG AT PDK.
Narrative: ON IFR FLT ON 10/FRI/91 FROM GYY TO PDK, I LOST THE ALTERNATOR ABOUT 60 NM S OF LOUISVILLE ON V51. I SAW THE AMMETER INDICATOR MOVE TO THE 'DISCHARGE' SIDE, SO I FELT CONFIDENT I HAD A FULL BATTERY CHARGE. I ADVISED ATC OF THE PROBLEM AND GOT PERMISSION TO LEAVE THE FREQ AND TO TURN OFF THE TRANSPONDER. I TURNED OFF ALL THE AVIONICS AND OTHER USES OF BATTERY PWR, TRIED ALL CIRCUIT BREAKERS, ETC, BUT COULD NOT RESTORE ALTERNATOR CHARGING. I THEN TURNED ON 1 RADIO AND THE DME, CONTACTED ATC AND OBTAINED PERMISSION TO GO OFF THE AIR AGAIN. THIS WAS REPEATED 2 OR 3 TIMES TO GIVE POS RPTS, AND I ARRIVED AT PDK WITH AMPLE BATTERY RESERVE FOR COMS NAV, LOWERING THE GEAR AND FLAPS. THE PROBLEM TURNED OUT TO BE A MALFUNCTIONING VOLTAGE REGULATOR, WHICH WAS REPLACED AT PDK.
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.