COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F27 Series Aeroplanes AD/F27/120 Inner/Outer Wing Joint Stringer Coupling Rods 7/90 Applicability: F27 models with serial numbers 10102, and 10105 to 10624 inclusive. Requirement: Action in accordance with Fokker SB F27/57-64 Rev 1, Parts 1, 2 and 3. Note: Netherlands AD BLA 89-148 Issue 2 refers. Compliance: For Part 1: Prior to 31 October 1990. Parts 2 and 3 in accordance with the Requirement Document. Background: Country of origin AD. Stress corrosion cracking can occur in the coupling rods.