A seeming altitude deviation in class east airspace with emj-135 aircraft having too low an altitude readout on their mode C, 50 NM from dtw on frequency with ZOB, vhp, in.

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Attributes
ACN	512030
Time
Date	200105
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw.airport
State Reference	MI
Altitude	msl bound lower : 11700 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 135 ER&LR
Flight Phase	cruise : level descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 15000 flight time type : 700
ASRS Report	512030
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude altitude deviation : undershoot non adherence : clearance other anomaly other
Resolutory Action	controller : issued advisory none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance ATC Facility Aircraft
Primary Problem	Aircraft

Narrative:

ATC showed 300 ft below indicated altitude. We advised level at 12000 ft and confirmed altimeter setting.

Original NASA ASRS Text

Title: A SEEMING ALTDEV IN CLASS E AIRSPACE WITH EMJ-135 ACFT HAVING TOO LOW AN ALT READOUT ON THEIR MODE C, 50 NM FROM DTW ON FREQ WITH ZOB, VHP, IN.

Narrative: ATC SHOWED 300 FT BELOW INDICATED ALT. WE ADVISED LEVEL AT 12000 FT AND CONFIRMED ALTIMETER SETTING.

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.