Aircraft level at 3000 ft. Mode C readout periodically showing erroneous altitude of 10500 ft. Reporter states there was no other traffic in the area.

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Attributes
ACN	345790
Time
Date	199608
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lal
State Reference	FL
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : tpa tower : aus
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
ASRS Report	345790
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Events
Anomaly	other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Nga assigned and level at 3000 ft, beacon code (local assigned). Many sweeps indicated 10500 ft. No other targets or beacons were near this aircraft.

Original NASA ASRS Text

Title: ACFT LEVEL AT 3000 FT. MODE C READOUT PERIODICALLY SHOWING ERRONEOUS ALT OF 10500 FT. RPTR STATES THERE WAS NO OTHER TFC IN THE AREA.

Narrative: NGA ASSIGNED AND LEVEL AT 3000 FT, BEACON CODE (LCL ASSIGNED). MANY SWEEPS INDICATED 10500 FT. NO OTHER TARGETS OR BEACONS WERE NEAR THIS ACFT.

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.