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Citation 500 pilot has malfunctioning autoplt which turns aircraft off course without pilot input. Autoplt turned off and return to assigned heading.
| Attributes | |
| ACN | 358983 |
| Time | |
| Date | 199701 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zme |
| State Reference | TN |
| Altitude | msl bound lower : 29000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme |
| Operator | general aviation : personal |
| Make Model Name | Citation I |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : private |
| Experience | flight time last 90 days : 40 flight time total : 3000 flight time type : 500 |
| ASRS Report | 358983 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
We were climbing out of FL290, talking to ZME, heading 230 degrees direct to hou from mystic VOR. At FL290 the autoplt began a severe turn to the right, and about 15-20 degrees to the right the pilot turned the autoplt off and began the turn back to 230 degrees. Center called and said do not turn unless notifying center. We replied by stating: the autoplt malfunctioned and the altered heading was not intentional nor necessary. Callback conversation with reporter revealed the following information: reporter states that the bendix unit has been overhauled and there are no further problems. The altitude hold had worn and failed. The aircraft was a citation 500.
Original NASA ASRS Text
Title: CITATION 500 PLT HAS MALFUNCTIONING AUTOPLT WHICH TURNS ACFT OFF COURSE WITHOUT PLT INPUT. AUTOPLT TURNED OFF AND RETURN TO ASSIGNED HDG.
Narrative: WE WERE CLBING OUT OF FL290, TALKING TO ZME, HDG 230 DEGS DIRECT TO HOU FROM MYSTIC VOR. AT FL290 THE AUTOPLT BEGAN A SEVERE TURN TO THE R, AND ABOUT 15-20 DEGS TO THE R THE PLT TURNED THE AUTOPLT OFF AND BEGAN THE TURN BACK TO 230 DEGS. CTR CALLED AND SAID DO NOT TURN UNLESS NOTIFYING CTR. WE REPLIED BY STATING: THE AUTOPLT MALFUNCTIONED AND THE ALTERED HDG WAS NOT INTENTIONAL NOR NECESSARY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THE BENDIX UNIT HAS BEEN OVERHAULED AND THERE ARE NO FURTHER PROBS. THE ALT HOLD HAD WORN AND FAILED. THE ACFT WAS A CITATION 500.
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.