ATC advised flight crew of an MD80 that the altimeter readout of mode C showed 300 ft low. Autoplt leveled aircraft 150 ft higher than altimeter showed. Altimeter system was written up for maintenance disposition.

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Attributes
ACN	355120
Time
Date	199612
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute airway : dfw
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	355120
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Altimeter malfunction. Location: dfw, 127-40. Autoplt leveled aircraft approximately 150 ft high, as indicated on center altimeter. ATC controller subsequently said he showed us 300 ft below indicated altitude. Altimeter barometric settings were correct. Controller said there was no conflict. Altimeter problem was written up in aircraft logbook.

Original NASA ASRS Text

Title: ATC ADVISED FLC OF AN MD80 THAT THE ALTIMETER READOUT OF MODE C SHOWED 300 FT LOW. AUTOPLT LEVELED ACFT 150 FT HIGHER THAN ALTIMETER SHOWED. ALTIMETER SYS WAS WRITTEN UP FOR MAINT DISPOSITION.

Narrative: ALTIMETER MALFUNCTION. LOCATION: DFW, 127-40. AUTOPLT LEVELED ACFT APPROX 150 FT HIGH, AS INDICATED ON CTR ALTIMETER. ATC CTLR SUBSEQUENTLY SAID HE SHOWED US 300 FT BELOW INDICATED ALT. ALTIMETER BAROMETRIC SETTINGS WERE CORRECT. CTLR SAID THERE WAS NO CONFLICT. ALTIMETER PROB WAS WRITTEN UP IN ACFT LOGBOOK.

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.