What was found
(CAN) AFTER LANDING PILOT NOTICED A LOSS OF STEERING CONTROL WITH TILLER. INVESTIGATION DETERMINED THAT THE STEERING STUD HAD SHEARED WHERE ROLL PIN SECURES IT TO STEERING COLLAR. FURTHER INVESTIGATION DETERMINED THAT THE STUD ASSEMBLY SHEARED WHERE THE THREAD FINISHES AT THE LOWER END DUE TO EXCESS CLEARANCE IN THE SLEEVE BORE WHICH SUBJECTED THE STUD TO AN ALTERNATING SHEAR LOAD.