What was found
CREW DID NOT RECEIVE A GREEN DOWN AND LOCKED INDICATION ON THE RIGHT MAIN LANDING GEAR UPON GEAR EXTENSION. AN UNEVENTFUL LANDING WAS MADE AFTER TOWER CONFIRMED THAT THE GEAR WAS DOWN. INITIAL INSPECTION BY PERSONNEL FOUND THE RIGHT DOWN LIMIT SWITCH WAS OUT OF RIG. THE SWITCH WAS ADJUSTED AND A GEAR RETRACTION TEST WAS PERFORMED. UPON THE EMERGENCY EXTENSION CHECK, THE SWITCH IN QUESTION ACTUATING ARMS HINGE PIN BECAME DISLODGED AND ALLOWED THE SWITCH TO DEACTIVATE. SWITCH WAS REPLACED AND SYSTEM CHECKED GOOD. UPON COMPARISON WITH A NEW SWITCH, THE HINGE PIN HOLES WERE LARGER AND ALLOWED THE MOVEMENT OF THE PIN UNTIL THE SWITCH FAILED.