What was found
THE PILOT REPORTED THAT WHILE DURING A TRAINING FLIGHT DURING CRUISE APPROXIMATELY 10 MINUTES INTO THE FLIGHT, THE PILOT NOTICED A SMELL OF SMOKE FILL THE CABIN. THIS WAS IMMEDIATELY FOLLOWED BY THE HYD & SERVO AMBER CAUTION LIGHTS INDICATING A RT HYD SYS FAILURE. THE TRAINING CREW ON BOARD IMMEDIATELY OPENED THE CABIN WINDOWS & RETURNED TO THE LOCAL AIRPORT WITH FURTHER DAMAGE OR INCIDENT. AFTER SHUTDOWN, IT WAS NOTED BY THE TRAINING CREW THAT THE CAUSE OF THE SMOKE SMELL WAS A FAULTY HYD PUMP DRIVE. THIS ACFT IS CURRENTLY OUT OF SERVICE FOR THIS EVENT, AWAITING PARTS.