Bendix Avionics Airworthiness Directives

Airworthiness Directives; BENDIX AVIONICS: Applies to M-4 (A, B, C, D) Autopilot Primary Servo Models 3013E, 3013F, 3013G, 3013H, 3013J and 3013K and YD-4 Yaw Damper Primary Servos Models 3013J and 3013K having magnetic clutch, P/N 717503-0001, Serial Numbers 16750 through 18396

Unsafe Condition: Failure of the primary servo due to seizure of the magnetic clutches (P/N 717503-0001, Serial Numbers 16750 through 18396).

Why matched: Airworthiness Directives; BENDIX AVIONICS: Applies to M-4 (A, B, C, D) Autopilot Primary Servo Models 3013E, 3013F, 3013G, 3013H, 3013J and 3013K and YD-4 Yaw Damper Primary Servos Models 3013J and 3013K having magnetic clutch, P/N 717503-0001, Serial Numbers 16750 through 18396