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At level off, autoplt nosed aircraft up rapidly and would not disconnect until all electric power was turned off. Reporter says that all functions checked good on post flight.
| Attributes | |
| ACN | 324150 |
| Time | |
| Date | 199512 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lft |
| State Reference | LA |
| Altitude | msl bound lower : 9000 msl bound upper : 9650 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute airway : lft |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 30000 |
| ASRS Report | 324150 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On leveling at 9000 ft the autoplt did a rapid nose up climb to approximately 9650 ft. I had to pull circuit breaker and shut all electric power off to release the autoplt. I rapidly nosed aircraft nose down and was back to 9000 ft in seconds. Departure control asked what my altitude was, at that time I was descending through 9100-9000 ft. I said I was at 9100 ft. He said maintain 9000 ft, I said roger maintain 9000 ft. Departure control said he had lost my transponder, I said it should come on in a min. Departure control said he had my transponder back, departure control changed me to baton rouge approach control. Nothing more was said by lft departure or myself, I reset circuit breaker on autoplt and autoplt worked ok. This has happened before, however, autoplt would disconnect immediately. I rechked all functions and everything checks ok.
Original NASA ASRS Text
Title: AT LEVEL OFF, AUTOPLT NOSED ACFT UP RAPIDLY AND WOULD NOT DISCONNECT UNTIL ALL ELECTRIC PWR WAS TURNED OFF. RPTR SAYS THAT ALL FUNCTIONS CHKED GOOD ON POST FLT.
Narrative: ON LEVELING AT 9000 FT THE AUTOPLT DID A RAPID NOSE UP CLB TO APPROX 9650 FT. I HAD TO PULL CIRCUIT BREAKER AND SHUT ALL ELECTRIC PWR OFF TO RELEASE THE AUTOPLT. I RAPIDLY NOSED ACFT NOSE DOWN AND WAS BACK TO 9000 FT IN SECONDS. DEP CTL ASKED WHAT MY ALT WAS, AT THAT TIME I WAS DSNDING THROUGH 9100-9000 FT. I SAID I WAS AT 9100 FT. HE SAID MAINTAIN 9000 FT, I SAID ROGER MAINTAIN 9000 FT. DEP CTL SAID HE HAD LOST MY XPONDER, I SAID IT SHOULD COME ON IN A MIN. DEP CTL SAID HE HAD MY XPONDER BACK, DEP CTL CHANGED ME TO BATON ROUGE APCH CTL. NOTHING MORE WAS SAID BY LFT DEP OR MYSELF, I RESET CIRCUIT BREAKER ON AUTOPLT AND AUTOPLT WORKED OK. THIS HAS HAPPENED BEFORE, HOWEVER, AUTOPLT WOULD DISCONNECT IMMEDIATELY. I RECHKED ALL FUNCTIONS AND EVERYTHING CHKS OK.
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.