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Thread: Unusual Behaviour

  1. #1

    Unusual Behaviour

    On Sunday I was flying along with the AP engaged following the heading and altitude bugs on the 4500. Everything was fine until ATC announced a pressure change from 1016 to 1017 mlb. When I made the adjustment on the Baro...the aircraft suddenly began to ascend, in a pitching or jerking motion...almost like a stepping function. It was reasonably violent, like someone jerking back the stick, releasing, jerking back, etc. We rapidly gained 500 feet in the span of 30 seconds until I disengaged the AP.

    I descended, made sure everything appeared okay and re-engaged the AP. Again it followed the 4500 bugs. I then changed the Baro back to 1016 and it exhibited the same behaviour.

    Later in the flight I engaged the AP and changed the Baro and everything seemed ok?

  2. #2
    Sounds like the AP pitch servo was slipping. Do you have auto trim? If the elevator is not in trim it could be near the torque limit and a small altitude change would cause it to slip.
    Rob Hickman
    Advanced Flight Systems Inc.

  3. #3
    Thanks...that's what I suspected but I do have auto trim.

  4. #4
    You may need to speed the autotrim up a little bit.
    Trutrak Tech Support

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