An air carrier widebody transport leveled off 200 ft high. Aircraft equipment problem altimeters did not agree, off by 80 ft. This should be close enough at altitude, but slightly out of limits at origin. Error admitted.

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Attributes
ACN	341900
Time
Date	199607
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pye
State Reference	CA
Altitude	msl bound lower : 31000 msl bound upper : 31200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : pacific
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : instrument pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 250 flight time total : 17000 flight time type : 3000
ASRS Report	341900
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance non adherence : published procedure
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

After level off at cruise altitude en route to hnl, captain's altimeter read approximately 80 ft higher than first officer's. With first officer flying and using his altimeter, first officer leveled off approximately 60 ft above FL310. Center controller commented his altitude was showing our flight operating at 31200 ft (200 ft high). This was due to difference in our altimeters and slightly high level off.

Original NASA ASRS Text

Title: AN ACR WDB LEVELED OFF 200 FT HIGH. ACFT EQUIP PROB ALTIMETERS DID NOT AGREE, OFF BY 80 FT. THIS SHOULD BE CLOSE ENOUGH AT ALT, BUT SLIGHTLY OUT OF LIMITS AT ORIGIN. ERROR ADMITTED.

Narrative: AFTER LEVEL OFF AT CRUISE ALT ENRTE TO HNL, CAPT'S ALTIMETER READ APPROX 80 FT HIGHER THAN FO'S. WITH FO FLYING AND USING HIS ALTIMETER, FO LEVELED OFF APPROX 60 FT ABOVE FL310. CTR CTLR COMMENTED HIS ALT WAS SHOWING OUR FLT OPERATING AT 31200 FT (200 FT HIGH). THIS WAS DUE TO DIFFERENCE IN OUR ALTIMETERS AND SLIGHTLY HIGH LEVEL OFF.

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.