What was found
CRACK RUNS FROM THE SPARK PLUG BASE TO THE EXHAUST VALVE. THIS IS TYPICAL OF MOST CRACKS FOUND IN ECI CYLINDERS. TO DATE, FROM FIRST OF YEAR FOR THIS COMPANY, WE HAVE HAD 10 CRACKED CYLINDERS IN 1800 HOURS OF FLYING. IT IS RECOMMENDED THAT ANY AC OWNER OPERATING WITH ECI CYLINDERS INSTALLED ON THEIR ENGINES, PERFORM A COMPRESSION CHECK EACH 50 HOURS. IT IS FURTHER RECOMMENDED THAT DURING THE COMPRESSION CHECK THAT SOAP SOLUTION BE APPLIED TO THE OUTER PORTION OF CYLINDER IN FIN AREA TO CHECK FOR CRACKS. THIS SHOP HAS FOUND CYLINDER WITH GOOD COMPRESSION AND STILL HAVE CRACK IN CYLINDER FIN AREA. (SW05200507954) (K)