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Guest airbusmaster

a340 PITCH TRIM PROBLEM

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Hi,when I am in climb mode and i switch autopilot off the plane begins to trim up and then down constantly, causing the plane to pitch up and down as if it were in severe turbulance. This happens untill I switch autopilot back on, and then she flies fine. this happens on random occasions, and not all the time. I think that there is something wrong with the fly by wire system as it is an issue with the computers use of elevator trim when hand flying. It is essentially getting the trim wrong, sending my VS from +9000 to -9000 in a few seconds..any fixes?

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