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An air carrier DC10 flight crew descended below their assigned altitude when they misunderstood the assignment.
| Attributes | |
| ACN | 388690 |
| Time | |
| Date | 199712 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : gep airport : msp |
| State Reference | MN |
| Altitude | msl bound lower : 6000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : msp |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 23000 flight time type : 220 |
| ASRS Report | 388690 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : far |
| 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 |
Narrative:
Approach cleared flight to descend to 4000 ft from 11000 ft and slow to 210 KTS at 4000 ft. At about 6000 ft, approach told us to climb back to 9000 ft. Clearance was read back as descend to 4000 ft and slow to 210 KTS at 4000 ft. This was the way the clearance was understood by all 3 crew members.
Original NASA ASRS Text
Title: AN ACR DC10 FLC DSNDED BELOW THEIR ASSIGNED ALT WHEN THEY MISUNDERSTOOD THE ASSIGNMENT.
Narrative: APCH CLRED FLT TO DSND TO 4000 FT FROM 11000 FT AND SLOW TO 210 KTS AT 4000 FT. AT ABOUT 6000 FT, APCH TOLD US TO CLB BACK TO 9000 FT. CLRNC WAS READ BACK AS DSND TO 4000 FT AND SLOW TO 210 KTS AT 4000 FT. THIS WAS THE WAY THE CLRNC WAS UNDERSTOOD BY ALL 3 CREW MEMBERS.
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.