What was found
PBI/TLH - FLT 5287 - ON APPROACH, FLAPS WERE SELECTED TO 17 DEREES AT WHICH TIME THE RT GEAR 'FREE FELL' OUT OF THE UP AND LOCKED POSITION. THE LANDING GEAR HANDLE WENT RED, THE LANDING GEAR CIRCUIT BREAKER TRIPPED AND THE GEAR HANDLE SOLENOID ENGAGED. THE CREW PERFORMED A MANUAL EXTENSION AND RECEIVED THREE DOWN AND LOCKED INDICATIONS, THE CREW LANDED WITH NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED THE RT MAIN GEAR ACTUATOR, OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (X)