COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Partenavia P68 Series Aeroplanes AD/P68/18 Oil Cooler Elbow Fitting - Replacement 12/79 Applicability: All models P68 and P68B with S/Nos. 182 and below, except 74, 89, 133, 142, 155, 163 and 171. Requirement: Replace the oil cooler left hand elbow fitting P/N AN822-6-6D in accordance with page No. 3 of Partenavia SB No. 45. Compliance: Within 100 hours time in service after 31 December 1979. Background: In order to reduce strain on hose and fitting the oil cooler left hand elbow is replaced with an elbow of a more suitable angle.