These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.
Cessna Aircraft Company 172, 175, 180, 182, 185, 206, 207, 208, 210, and 303 Series…
May 12, 2008
Airframe (R172K)Certain serial numbers: 172S 172S10672–172S10674; 172S 172S10676; 172S 172S10678–172S10680; 172S 172S10682; 172S 172S10683; 172S 172S10685; …. Only with: Applies only to airplanes that have a P/N 2013142-18 alternate static air source selector valve installed after November 19, 2007.
DURING INSPECTION FOR AN OIL LEAK, FOUND THE ENGINE CYLINDER HEAD CRACKED BEHIND THE ROCKER COVER AREA AND EXTENDING BEHIND THE INTAKE VALVE SPRAY. ONE DAY LATER, FOUND SIMILAR CRACK ON A DIFFERENT AIRPLANE WITH THE SAME MODEL ENGINE. AFTER CLOSE INSPECTION, UNABLE TO DETERMINE REASON. FIRST…
From FAA Service Difficulty Reports; matched by N-number and serial number.