What was found
DURING INSPECTION FOR AN OIL LEAK, FOUND THE ENGINE CYLINDER HEAD CRACKED BEHIND THE ROCKER COVER AREA AND EXTENDING BEHIND THE INTAKE VALVE SPRING. ONE DAY BEFORE FOUND, SIMILAR CRACK AND DIFFERENT AIRPLANE WITH SAME MODEL ENGINE. AFTER CLOSE INSPECTION, UNABLE TO DETERMINE REASON. FIRST ACFT, CESSNA R172K, ENGINE IO-360-K, S/N 355310. SECOND ACFT, PIPER PA34200T, ENGINE LTSIO-360-E, S/N 306232.