What was found
AIRCRAFT LAND GEAR EXTENSION CARRIED OUT AS NORMAL ON AIRPORT APPROACH. ON THE GROUND, THE PILOT NOTICED THAT THE RIGHT MAIN GEAR INBOARD DOOR WAS NOT CLOSED. UPON FURTHER INSPECTION BY AN AME, RT GEAR DOOR RETRACTION SYSTEM BELLCRANK P/N 0841106-6 WAS FOUND TO HAVE FAILED COMPLETELY AND HAD BROKEN IN TWO. A NEW BELLCRANK HAS BEEN INSTALLED AND THE GEAR SYSTEM HAS BEEN CHECKED FOR SIGNS OF STRESS, RUBBING OR INTERFERENCE. ALL WITH NO FAULTS FOUND. SEVERAL GEAR RETRACTION TEST HAVE BEEN CARRIED OUT. THE LEFT GEAR DOOR MATCHING BELLCRANK HAS BEEN CHECKED FOR CRACKS USING MAGNAFLUX FLUORESCENT PENETRANT. THE FAILED BELLCRANK DID SHOW SIGNS OF A WORKING FATIGUE CRACK AND CONSEQUENT FAILURE.