Small aircraft on initial climb has high voltage light flickering and ammeter needle fluctuating. After return land taxies across active runway without clearance.

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Attributes
ACN	269934
Time
Date	199404
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : hef
State Reference	VA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial ground other : taxi landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 10 flight time total : 363 flight time type : 290
ASRS Report	269934
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical incursion : runway non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I took off on an IFR flight plan from hef (manassas, va) to frg (farmingdale, ny). The WX was clear. Upon climb out and after reaching approximately 3000 ft, I noticed the high voltage light flickering. The ammeter needle was fluctuating at that time as well, and I noticed a hiss in the radios. I notified ATC of the problem and requested return to the field at hef. During my visual approach to hef, the controller asked which runway I wanted and whether I needed assistance. I believe that I stated that I was parking on the west side but requested 34R (the runway on the east side) because it was longer. After landing, the controller cleared me for taxiing to the east ramp. Having been concerned, however, about the high voltage problem, I continued my taxi to the west ramp. This involves crossing 34L, a parallel runway. As it was early in the morning, there was no traffic and the controller didn't say anything. I stated my apologies and the ground controller cleared me for taxi to the west ramp. The next time, I'll try to state my intentions more clearly and try to listen more intently, though it will be very difficult after problem sits occur.

Original NASA ASRS Text

Title: SMA ON INITIAL CLB HAS HIGH VOLTAGE LIGHT FLICKERING AND AMMETER NEEDLE FLUCTUATING. AFTER RETURN LAND TAXIES ACROSS ACTIVE RWY WITHOUT CLRNC.

Narrative: I TOOK OFF ON AN IFR FLT PLAN FROM HEF (MANASSAS, VA) TO FRG (FARMINGDALE, NY). THE WX WAS CLR. UPON CLBOUT AND AFTER REACHING APPROX 3000 FT, I NOTICED THE HIGH VOLTAGE LIGHT FLICKERING. THE AMMETER NEEDLE WAS FLUCTUATING AT THAT TIME AS WELL, AND I NOTICED A HISS IN THE RADIOS. I NOTIFIED ATC OF THE PROB AND REQUESTED RETURN TO THE FIELD AT HEF. DURING MY VISUAL APCH TO HEF, THE CTLR ASKED WHICH RWY I WANTED AND WHETHER I NEEDED ASSISTANCE. I BELIEVE THAT I STATED THAT I WAS PARKING ON THE W SIDE BUT REQUESTED 34R (THE RWY ON THE E SIDE) BECAUSE IT WAS LONGER. AFTER LNDG, THE CTLR CLRED ME FOR TAXIING TO THE E RAMP. HAVING BEEN CONCERNED, HOWEVER, ABOUT THE HIGH VOLTAGE PROB, I CONTINUED MY TAXI TO THE W RAMP. THIS INVOLVES XING 34L, A PARALLEL RWY. AS IT WAS EARLY IN THE MORNING, THERE WAS NO TFC AND THE CTLR DIDN'T SAY ANYTHING. I STATED MY APOLOGIES AND THE GND CTLR CLRED ME FOR TAXI TO THE W RAMP. THE NEXT TIME, I'LL TRY TO STATE MY INTENTIONS MORE CLRLY AND TRY TO LISTEN MORE INTENTLY, THOUGH IT WILL BE VERY DIFFICULT AFTER PROB SITS OCCUR.

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.