What was found
DURING APPROACH, WHEN THE GEAR HANDLE WAS SELECTED TO DOWN POSITION THE GEAR FAILED TO EXTEND. REFERENCED THE QRH & DISCOVERED THE LG RELAY CIRCUIT BREAKER TRIPPED. RESET THE CIRCUIT BREAKER, GEAR EXTENSION WAS NORMAL & LANDING WAS UNEVENTFUL. SERVICED THE HYD RESERVOIR & ACCUMULATOR, PERFORMED SEVERAL GEAR SWINGS, INSPECTED GEAR UPLOCK SWITCHES & GEAR RELAY CIRCUIT BREAKER WITH NO DEFECTS NOTED. ACFT WAS RETURNED TO SERVICE.