What was found
DURING CRUISE FLIGHT, CREW NOTICED THE ODOR OF SMOKE IN COCKPIT, FOLLOWED SHORTLY BY THE HYD & SERVO AMBER CAUTION LIGHT, RT HYD SYS FAILURE. THERE WAS NO LOSS OF ACFT CONTROLLABILITY, RETURNED TO DEPARTURE WITHOUT FURTHER DAMAGE OR INCIDENT. AFTER SHUTDOWN, DISCOVERED THE BELT FOR THE RT HYD PUMP UNDERNEATH THE MAIN ROTOR TRANSMISSION & PUMP ITSELF WAS COMPLETELY SEIZED. REPLACED PUMP DRIVE ASSEMBLY. FUNCTIONAL CHECKED GOOD WITH NO DEFECTS NOTED. THE ACFT WAS THEN RETURNED TO SERVICE.