What was found
(CAN) DURING CLIMB, CREW REPORTED A CHIP DETECTOR INDICATION MESSAGE FOLLOWED BY LOSS OF OIL PRESSURE. THE ENGINE WAS SHUTDOWN AND SECURED BEFORE AN UNEVENTFUL SINGLE ENGINE LANDING WAS ACCOMPLISHED AT THE DEPARTURE AIRPORT. POST FLIGHT INSPECTION FOUND A CRACKED REDUCTION GEARBOX FRONT HOUSING, RT. SIDE BETWEEN THE PINION GEAR COVER AND HOUSING MOUNTING FLANGE.