310Q Autopilot erratic pitch commands

310Q Autopilot erratic pitch commands

We have a 310Q with an 800 autopilot system installed. We have a a problem with the airplane pitching up then down real quick every so often while in ALT hold. Sometimes we can fly an entire leg without a problem then it comes back on the next leg.
We have had the vertical gyro overhauled thinking that the pick offs that feed the A/P computer may have been intermittent. No help. The A/P computer was O/H'd and the entire static system is tight. No help. Can someone give me some ideas?
Thanks

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Re: 310Q Autopilot erratic pitch commands

Had you checked to see if servos are free of binds and pulleys and cables are properly tensioned.

Bill

Bill Brodbeck
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Re: 310Q Autopilot erratic pitch commands

Yes. The pulleys and cable tensions are ok.

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Re: 310Q Autopilot erratic pitch commands

Flew C310's and had the same problem with 310's and Mitsubishi Mu-2 M-3 autopilot's...servicing pitch servo took care of the problem.

Richard Smith
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