What was found
(CAN) DURING CRUISE, PILOTS NOTED NR 2 ENGINE OIL PRESSURE DROPPING, THIS WAS QUICKLY FOLLOWED BY A LOW OIL PRESSURE WARNING LIGHT. CREW REPORTED A LOUD NOISE AND THE ENGINE SPOOLED DOWN. THE CREW SECURED ENGINE AND ACTIONED THE ENGINE FIRE BOTTLE. DECLARED AN EMERGENCY AND PERFORMED AN UNEVENTFUL SINGLE ENGINE LANDING. INSPECTION OF THE REMOVED ENGINE IN HANGAR SHOWED NO SIGN OF FIRE. BOTH CT & PT ROTORS WERE FREE TO ROTATE WITHOUT ANY RUBBING OR HANG-UP. PT BLADES LOOKED NORMAL AND THERE WAS NO DAMAGE TO THE PT BLADES.