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Deviation from clearance when air carrier large transport doesn't descend to altitude cleared to because of a misread altimeter.
| Attributes | |
| ACN | 141297 |
| Time | |
| Date | 199003 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zmp airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 9000 msl bound upper : 19000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zmp tower : acy |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 100 flight time total : 8000 flight time type : 150 |
| ASRS Report | 141297 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
We were given instructions to descend from cruise and maintain 10000'. We were told to cross intersection at 17000', descend and maintain 10000', and later, to maintain 9000'. We leveled off at what we thought was the proper altitude at the proper time. Approach control called and asked if we could make the descent okay. Only at that time did we realize we had misread our altimeter by 10000'. These were the old type altimeters which are easy to misread. We explained that we had made a mistake and hurried on down. The controller understood and explained there was no problem since there was no traffic in the area.
Original NASA ASRS Text
Title: DEVIATION FROM CLRNC WHEN ACR LGT DOESN'T DESCEND TO ALT CLEARED TO BECAUSE OF A MISREAD ALTIMETER.
Narrative: WE WERE GIVEN INSTRUCTIONS TO DSND FROM CRUISE AND MAINTAIN 10000'. WE WERE TOLD TO CROSS INTXN AT 17000', DSND AND MAINTAIN 10000', AND LATER, TO MAINTAIN 9000'. WE LEVELED OFF AT WHAT WE THOUGHT WAS THE PROPER ALT AT THE PROPER TIME. APCH CTL CALLED AND ASKED IF WE COULD MAKE THE DSCNT OKAY. ONLY AT THAT TIME DID WE REALIZE WE HAD MISREAD OUR ALTIMETER BY 10000'. THESE WERE THE OLD TYPE ALTIMETERS WHICH ARE EASY TO MISREAD. WE EXPLAINED THAT WE HAD MADE A MISTAKE AND HURRIED ON DOWN. THE CTLR UNDERSTOOD AND EXPLAINED THERE WAS NO PROBLEM SINCE THERE WAS NO TFC IN THE AREA.
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.