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re 400a
400 AP is a good autopilot! like everything else you do need to pay some attention to it if it is going to satisfy your needs.
There are still lots of places that service them. I would recommend fixing it before investing in a lot of money. It is NOT rate based but a true two axis autopilot that will correct the heading before a rate of change is detected.
90% of the time it is the servo or power supply that is giving problems.
Mine is fully coupled including a 90b interface. Works flawlessly!
fyi
Bob
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