New servos will be required. The STC requires the system be installed complete, not piece-meal. You could try to make it work on a 337 field approval, but I bet it would be hard.
STEC, now Genesys Aerosystems is located an hour away from me.
You could also contact one of the firms that specializes in working on old Cessna autopilots. They may be able to sell and install a used/overhauled Navomatic 400 head for it, you would have to check.
Last edited by mshac : 08-23-21 at 03:10 PM.
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