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ATP rated pilot on vectors from ATC in an MU2J and flying on autoplt lost the attitude gyro while in a turn. The autoplt did not disengage, and the aircraft descended from an assigned altitude of 6000 ft MSL to 1700 ft MSL before the pilot was able to regain control of the airplane.
| Attributes | |
| ACN | 433106 |
| Time | |
| Date | 199904 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| State Reference | MI |
| Altitude | msl bound lower : 1700 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air taxi |
| Make Model Name | MU-2 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : cfi pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 100 flight time total : 7000 flight time type : 100 |
| ASRS Report | 433106 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Lost attitude indicator during autoplt turn. Autoplt did not turn off. The aircraft went into a steep spiral 'spin like' descent. Descent went from approximately 6000 ft to 1700 ft MSL. I used standard partial panel recovery.
Original NASA ASRS Text
Title: ATP RATED PLT ON VECTORS FROM ATC IN AN MU2J AND FLYING ON AUTOPLT LOST THE ATTITUDE GYRO WHILE IN A TURN. THE AUTOPLT DID NOT DISENGAGE, AND THE ACFT DSNDED FROM AN ASSIGNED ALT OF 6000 FT MSL TO 1700 FT MSL BEFORE THE PLT WAS ABLE TO REGAIN CTL OF THE AIRPLANE.
Narrative: LOST ATTITUDE INDICATOR DURING AUTOPLT TURN. AUTOPLT DID NOT TURN OFF. THE ACFT WENT INTO A STEEP SPIRAL 'SPIN LIKE' DSCNT. DSCNT WENT FROM APPROX 6000 FT TO 1700 FT MSL. I USED STANDARD PARTIAL PANEL RECOVERY.
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.