Avidyne are very very slow in certifying the DFC90 for "new" aircraft types. I get the feeling, watching them and speaking to the same faces at shows etc, that they have lost their way. Most of their business got wiped out when Cirrus (etc) moved from Avidyne to G1000. Some of their MFDs are barely visible in sunlight - totally useless.
Garmin are also very slow with the GFC700 for other aircraft models, which is otherwise a very good (if not yet long term reliability proven) autopilot, flying correct intercepts etc.
STEC are a big retrofit market player but their AP has poor performance because it doesn't have a decent source of pitch and roll information.
Avidyne are using STEC servos for the DFC90 because it saves them developing their own, and developing and certifying the multitude of different servo mounts.
All these systems are a poor solution however because they use
brush DC motors which wear out after X hours and then you have to hand fly... and pay out 4 figures for a fix. They should have gone brushless... the model airplane world did so yonks ago, and anyway one would probably use a stepper motor for an autopilot servo.
This is a rather poor example of the use of brush motors, and crap electronics design, by Honeywell, in autopilots
