COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Coolers AD/COOL/1 Stewart Warner Oil Coolers - Inspection NK and Replacement Applicability: Stewart Warner oil coolers: Model 8406J with S/Nos. 101 to 1500 10599A with S/Nos. 101 to 700 10568B with S/Nos. 101 to 579 10578B with S/Nos. 101 to 634 Requirement: Inspect the engine oil cooler for applicability within the affected model and serial number range. Any affected cooler shall be retired from service and replaced with a serviceable cooler not of the subject serial numbered range. Note: The oil coolers are fitted to, but not necessarily limited to, the following aircraft: 1. 1976 and 1977 Model Cessna 172 and 177. 2. 1976 Model Cessna 177RG. 3. Consolidated Aeronautics Lake LA-4-200. 4. Grumman American Model AA-5A and AA-5B. 5. Mooney M20 Series. Compliance: Within 100 hours time in service after 30 November 1976.