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An air carrier DC10 flight crew descended below their assigned altitude when the altitude capture mode of the autoplt malfunctioned.
| Attributes | |
| ACN | 384678 |
| Time | |
| Date | 199711 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : msp |
| State Reference | MN |
| Altitude | msl bound lower : 10500 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : zmp |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | other pilot : cfi pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 12000 flight time type : 250 |
| ASRS Report | 384678 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 11000 flight time type : 350 |
| ASRS Report | 384806 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft cleared to descend to 11000 ft. Autoplt #1 was engaged. Altitude did not capture. PF began corrective measure at 10800 ft, but descent continued to 10500 ft before climbing back to assigned 11000 ft. Flight proceeded to msp airport uneventfully. This situation could have been avoided by closer monitoring of the flight instruments.
Original NASA ASRS Text
Title: AN ACR DC10 FLC DSNDED BELOW THEIR ASSIGNED ALT WHEN THE ALT CAPTURE MODE OF THE AUTOPLT MALFUNCTIONED.
Narrative: ACFT CLRED TO DSND TO 11000 FT. AUTOPLT #1 WAS ENGAGED. ALT DID NOT CAPTURE. PF BEGAN CORRECTIVE MEASURE AT 10800 FT, BUT DSCNT CONTINUED TO 10500 FT BEFORE CLBING BACK TO ASSIGNED 11000 FT. FLT PROCEEDED TO MSP ARPT UNEVENTFULLY. THIS SIT COULD HAVE BEEN AVOIDED BY CLOSER MONITORING OF THE FLT INSTS.
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.