What was found
THE ALUMINUM CASTING OF THE MLG TRANSMISSION (PN 25720-002) WAS CRACKED IN 4 PLACES AND VERY CLOSE TO COMPLETE FAILURE. FAILURE OF THE HOUSING WOULD POSSIBLY CAUSE THE LANDING GEAR TO LOCK IN ANY POSITION. THE CRACKS WERE DISCOVERED DURING A GEAR RETRACTION TEST AFTER REPLACEMENT OF SEVERELY WORN GEAR DOOR HINGES. SUSPECT CAUSE OF TRANSMISSION CASTING TO FAIL DUE TO INCORRECT RIGGING OF GEAR SYSTEM CREATING OVERTORQUE.