What was found
(CAN) DURING LANDING, MLG SELECTED DOWN & NOTHING HAPPENED. CIRCUIT BREAKER TRIPPED. STARTED A MANUAL EMERGENCY MLG EXTEND MANUAL MLG EXTEND HANDLE ENGAGED, STUDENT COULDN`T MOVE ACT. AFTER SEVERAL ATTEMPTS & 2 STUDENTS MANAGED TO TURN ACT HANDLE. AFTER 1ST TURN HANDLE BECAME EASY TO MOVE. GEAR LOWERED SUCCESSFULLY & A/C LANDED. INSPECTION OF MLG ACT SYS, MLG MOTOR FOUND U/S WITH ONE BAD BRUSH. ACT WAS STIFF IN FULL UP POSITION. BOTH MOTOR & ACT REPLACED. PARTS SENT FOR INSPECT & REPAIR.