What was found
ON FIRST RUN UP OF THE DAY PILOT NOTED ACFT RAN ROUGH AND SOUNDED DIFFERENT. MX PERSONAL PERFORMED A VISUAL INSPECTION OF CYLINDERS AND FOUND NR 5 CYLINDER MISSING SEVERAL COOLING FINS AND A HOLE THE SIZE OF A PENCIL IN THE AREA OF THE EXHAUST PORT ON THE TOP OF THE CYLINDER HEAD. AFTER REMOVING CYLINDER A CRACK WAS NOTED FROM EXHAUST PORT ACROSS TOP SPARK PLUG BOSS TO INJECTOR PORT AND THOUGHT INTAKE PORT. ON THE INSIDE OF CYLINDER A CRACK PROPAGATED FROM TOP SPARK PLUG BOSS TO BOTH INTAKE AND EXHAUST SEATS. PN AEC63197, SN 20356-B, PART TT 1127.8, AD 2004-08-10 ADDRESSES SAME PN CYLINDER BUT LOWER SN THAN EFFECTED PART.