A super king air BE30 has a problem with its altitude encoder. ATC reports that the altitude displayed is above the aircraft's assigned altitude. Aircraft returns to base for maintenance action.

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Attributes
ACN	416230
Time
Date	199810
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : iow
State Reference	IA
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air taxi
Make Model Name	Super King Air 300
Operating Under FAR Part	Part 91
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial
Experience	flight time last 90 days : 25 flight time total : 9000 flight time type : 300
ASRS Report	416230
Person 2
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On a routine test flight at FL230 the altitude reporting encoder was reporting erroneous altitude intermittently. I verified to ARTCC that both altimeters were reading FL230 (at 29.92) and this was the altitude I was assigned, but they reported our 'readout' indicated higher on their screen. We aborted the flight and descended with ARTCC's instructions. We returned to base, moline, il, where the electronics difficulty was repaired/corrected and the aircraft returned to service.

Original NASA ASRS Text

Title: A SUPER KING AIR BE30 HAS A PROB WITH ITS ALT ENCODER. ATC RPTS THAT THE ALT DISPLAYED IS ABOVE THE ACFT'S ASSIGNED ALT. ACFT RETURNS TO BASE FOR MAINT ACTION.

Narrative: ON A ROUTINE TEST FLT AT FL230 THE ALT RPTING ENCODER WAS RPTING ERRONEOUS ALT INTERMITTENTLY. I VERIFIED TO ARTCC THAT BOTH ALTIMETERS WERE READING FL230 (AT 29.92) AND THIS WAS THE ALT I WAS ASSIGNED, BUT THEY RPTED OUR 'READOUT' INDICATED HIGHER ON THEIR SCREEN. WE ABORTED THE FLT AND DSNDED WITH ARTCC'S INSTRUCTIONS. WE RETURNED TO BASE, MOLINE, IL, WHERE THE ELECTRONICS DIFFICULTY WAS REPAIRED/CORRECTED AND THE ACFT RETURNED TO SVC.

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.