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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.
| 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.