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BE10 aircraft descended below assigned altitude by 600 ft due to flight crew inability to disconnect the autoplt. Reporter says they had to pull the circuit breaker for the autoplt before they could stop the descent.
| Attributes | |
| ACN | 366630 |
| Time | |
| Date | 199704 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : azo |
| State Reference | MI |
| Altitude | msl bound lower : 9400 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | King Air 100 A/B |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zau |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 60 flight time total : 7000 flight time type : 300 |
| ASRS Report | 366630 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
After leveling off at 10000 ft, the autoplt started a climb, which I counteracted, and then a descent. We couldn't stop the descent until the autoplt circuit breaker was pulled. We advised azo approach about our altitude change (9400 ft MSL) and they then cleared us down to 4000 ft. We contacted approach after landing and they advised us there was no loss of separation between aircraft and no further problems occurred.
Original NASA ASRS Text
Title: BE10 ACFT DSNDED BELOW ASSIGNED ALT BY 600 FT DUE TO FLC INABILITY TO DISCONNECT THE AUTOPLT. RPTR SAYS THEY HAD TO PULL THE CIRCUIT BREAKER FOR THE AUTOPLT BEFORE THEY COULD STOP THE DSCNT.
Narrative: AFTER LEVELING OFF AT 10000 FT, THE AUTOPLT STARTED A CLB, WHICH I COUNTERACTED, AND THEN A DSCNT. WE COULDN'T STOP THE DSCNT UNTIL THE AUTOPLT CIRCUIT BREAKER WAS PULLED. WE ADVISED AZO APCH ABOUT OUR ALT CHANGE (9400 FT MSL) AND THEY THEN CLRED US DOWN TO 4000 FT. WE CONTACTED APCH AFTER LNDG AND THEY ADVISED US THERE WAS NO LOSS OF SEPARATION BTWN ACFT AND NO FURTHER PROBS OCCURRED.
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.