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First officer of an large transport misset the FMC descent altitude causing the aircraft to overshoot assigned altitude.
| Attributes | |
| ACN | 335733 |
| Time | |
| Date | 199605 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 12000 flight time type : 4000 |
| ASRS Report | 335733 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Approach gave us 210 KTS and 11000 ft in one clearance. PNF read back clearance correctly. PF put 10000 ft in altitude window for FMS autoplt. PNF thought 11000 ft was set in window, but questioned PF, said we were cleared to 10000 ft. By the time crew could question ATC the aircraft already was at 10000 ft. I don't know if 210 KT speed plus 11000 ft in one clearance confused PF. I should have turned off autoplt and leveled off while we tried and cleared up clearance with approach. And I always confirmed altitude set in FMS window. I don't know what happened this time.
Original NASA ASRS Text
Title: FO OF AN LGT MISSET THE FMC DSCNT ALT CAUSING THE ACFT TO OVERSHOOT ASSIGNED ALT.
Narrative: APCH GAVE US 210 KTS AND 11000 FT IN ONE CLRNC. PNF READ BACK CLRNC CORRECTLY. PF PUT 10000 FT IN ALT WINDOW FOR FMS AUTOPLT. PNF THOUGHT 11000 FT WAS SET IN WINDOW, BUT QUESTIONED PF, SAID WE WERE CLRED TO 10000 FT. BY THE TIME CREW COULD QUESTION ATC THE ACFT ALREADY WAS AT 10000 FT. I DON'T KNOW IF 210 KT SPD PLUS 11000 FT IN ONE CLRNC CONFUSED PF. I SHOULD HAVE TURNED OFF AUTOPLT AND LEVELED OFF WHILE WE TRIED AND CLRED UP CLRNC WITH APCH. AND I ALWAYS CONFIRMED ALT SET IN FMS WINDOW. I DON'T KNOW WHAT HAPPENED THIS TIME.
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.