What was found
THE TAKE OFF WAS NORMAL. THE PILOT REPORTED THAT AFTER LEVEL OFF IN CRUISE FLIGHT THE RIGHT ENGINE TORQUE INDICATION STARTED TO FLUCTUATE FOLLOWED BY A DROP IN OIL PRESSURE. THE PILOT SHUT DOWN THE RIGHT ENGINE, DECLARED AN EMERGENCY, RETURNED AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE RIGHT ENGINE AND FOUND THE OIL DIPSTICK WAS NOT SECURED CAUSING A LOSE OF OIL WHICH IN TURN CAUSED THE LOW OIL PRESSURE INDICATION. THE DIPSTICK WAS INSPECTED AND FOUND TO FUNCTION NORMALLY. MAINTENANCE SERVICED THE ENGINE WITH OIL, PERFORMED THE REQUIRED INSPECTIONS PER THE PRATT & WHITNEY PT6A-36 MAINTENANCE MANUAL. ALL CHECKS WERE NORMAL, NO DEFECTS WERE FOUND AND THE ENGINE WAS RETURNED TO SERVICE.