An operator describes the cylinder heads he found cracked by compression testing during a 100-hour inspection.

“We are using a soap solution to detect cracks in the exhaust side of the cylinder while doing the compression checks. We are performing compression checks every 50 hours. Three cracked cylinders were found on the same engine (left) at this inspection.”

(Cylinder assembly part number noted as: TISN71.2ACA. Head cracks near the exhaust valves for cylinders 2, 4, and 6 were listed in this report. A second report on this aircraft’s R/H engine’s number 3 cylinder was also found cracked, having 1851.0 hours. This operator describes cracking cylinders as an on-going problem for his fleet of aircraft. See also the next two reports on different aircraft, but from this same operator.)

Part Total Time: 400.0 hours.