Now I'm working on my Hangar 9 150 Mustang. It has a Evolution 40 engine with the Keleo exhaust.

I'm using a Hitec Aurora 9 transmitter and a 9 channel receiver.

Servo chatter happens with the gear down only. It happens when the flaps are up or in the mid position, not when fully extended. No chatter with the gear up in any configuration. I believe it is the gear servos mostly the left.

Thanks Red