What was found
COMPRESSION FITTING PROVIDED WITH PLASTIC LINE FAILED IN ENGINE PLENUM CHAMBER AT FULL POWER DURING FLIGHT CAUSING OIL INGESTION INTO ENGINE CAUSING TURBINE OUTLET TEMPERATURE AND TORQUE SURGE WHEN OIL IGNITED WITH FUEL AIR MIXTURE IN BURNER CAN. FOUR QUART OIL SYSTEM, OIL REMAINING IN SYSTEM LESS THAN ONE PINT. PILOT ABLE TO SAFELY LAND MACHINE. STRONGLY SUGGEST METAL LINES IN PLENUM CHAMBER INSTEAD OF PLASTIC. MANUFACTURER IS AWARE OF PREVIOUS PROBLEMS WITH PLASTIC LINES. (X)