What was found
(CAN) NR 2 CYLINDER FAILED IN-FLIGHT AND A POWERLESS LANDING CARRIED OUT. INSPECTION FOUND THE EXHAUST VALVE BROKE AND THE HEAD SPLIT. THE CYLINDER WAS REPLACED. TWENTY MINUTES INTO TEST FLIGHT, THE ENGINE EXPERIENCED A POWER LOSS. AIRCRAFT LANDED SAFELY. POST-FLIGHT COMPRESSION TEST FOUND THE NR 7 CYLINDER WITH A DIFFERENTIAL PRESSURE OF 0/80. INSPECTION FOUND THE CYLINDER HEAD AND VALVE SEAT DAMAGED DUE TO FOD AND THE OIL SCREEN FULL OF ALUMINUM PARTICLES. WHEN NR 2 CYLINDER FAILED, THE EXHAUST VALVE BROKE AND DAMAGED THE INTAKE VALVE. PARTS FROM THE INTAKE VALVE WENT INTO THE MANIFOLD AND SUPERCHARGER SECTION, THEN TO THE NR 7 CYLINDER CAUSING THE FAILURE. THE ENGINE WAS REMOVED FROM SERVICE.