(The following combines two reports from the same source concerning type X ECI cylinders on different aircraft, both with the same engines.)

The submitter describes these ECI cylinders to have been in the number 6 position and of the type “X” configuration. “These cracked cylinder heads were found at the (50)/100 hour inspections. We are finding signs of air leakage on the exhaust side of the cylinder heads when doing a compression check. We are spraying soapy water on the cylinders...(for these inspection tests).” Part numbers were not provided with these submissions.

Part Total Times: 1,102.0 and 1,094.0 hours (respectively).