What was found
DURING FLIGHT THE ACTUATOR MASTER CAUTION ILLUMINATED. AIRCRAFT STARTED TO EXPERIENCE HEADING/TRIM ANOMALIES. FLIGHT CONTROLS ALSO BECAME INCREASINGLY SLUGGISH. DURING TEST FLIGHT EVAL, 35 MINUTES INTO FLIGHT, ACTUATOR ILLUMINATED ON CAD. PFD DISPLAYED A YAW AMBER INDICATION. AFTER LANDING, AP TEST WAS CONDUCTED AND AP1 AND AP2 FAILED TEST WITH YAW ACTUATOR ALONG WITH YAW SAS FAILING. REMOVED AND REPLACED T/R ACTUATOR IAW AMM 67-34-00, 4-1. TEST FLIGHT SUCCESSFULLY COMPLETED.