What was found
(CAN) TRAINING ACFT WITH DUAL CONTROLS AND AAI LOCKOUT PEDAL STC SH 96-92 INSTALLED. ON A TRAINING FLIGHT DURING AUTO ROTATION, ATTEMPTING POWER RECOVERY, TRAINEE HELD CONTROLS TIGHT WHILE TRAINING CAPTAIN ATTEMPTED TO INPUT FULL LEFT PEDAL. DURING PEDAL INPUT AAI EXPANDABLE PIN ASSY SHEARED AND FURTHER DISCOVERY REVEALED ROD END ON TUBE ASSY (206-001-020-067) 60 PERCENT CRACKED. ACFT LANDED SAFELY AND ACFT OVER TORQUE INSPECTION CARRIED OUT.