What was found
(CAN) FIRST FLIGHT OF THE DAY 2.2 HOURS DURATION WAS WITHOUT INCIDENT, ENGINE TRENDS PERFORMED & NOTHING NOTED UNUSUAL. SECOND FLIGHT, SHORTLY AFTER CRUISE POWER WAS SET AT 6500 FT, OIL PSI DROPPED TO 50 PSI, OIL TEMP APPROX 245 DEGREES & M/P DROPPED APPROX 10 INCHES. THEN OIL PSI DROPPED RAPIDLY TO 40 PSI. A STANDARD PRECAUTIONARY SHUTDOWN PERFORMED. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE VISUAL & GROUND FUNCTION TEST PERFORMED. RT ENGINE OIL PSI OBSERVED APPROX 20 PSI LOW COMPRESSION LEAK DOWN C/O NO DEFECTS NOTED. OIL FILTER INSPECTION REVEALED METAL CONTAMINATION. SUCTION SCREEN INSPECTION REVEALED 0.3 OZ OF SOFT, SHINY BEARING LIKE FLAKES.