Flight crew and ATC experience new aircraft with flawed encoding altimeter.

Attributes
ACN	322130
Time
Date	199511
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zid
State Reference	IN
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	general aviation : personal
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 7200 flight time type : 3
ASRS Report	322130
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other controllera
Resolutory Action	flight crew : overcame equipment problem
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During the flight to reposition a newly purchased aircraft from dal to cmh with an intermediate stop at luk, ATC made numerous inquiries concerning the aircraft altitude. Reporting indicated 300-700 ft low. After changing xponders, all reporting of altitude appeared to be correct. Each time ATC made an inquiry, the aircraft was at the assigned altitude.

Original NASA ASRS Text

Title: FLC AND ATC EXPERIENCE NEW ACFT WITH FLAWED ENCODING ALTIMETER.

Narrative: DURING THE FLT TO REPOSITION A NEWLY PURCHASED ACFT FROM DAL TO CMH WITH AN INTERMEDIATE STOP AT LUK, ATC MADE NUMEROUS INQUIRIES CONCERNING THE ACFT ALT. RPTING INDICATED 300-700 FT LOW. AFTER CHANGING XPONDERS, ALL RPTING OF ALT APPEARED TO BE CORRECT. EACH TIME ATC MADE AN INQUIRY, THE ACFT WAS AT THE ASSIGNED ALT.

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.