COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-60 Series Aeroplanes AD/SD3-60/4 Main Undercarriage Pintle Pin Bush - Modification 2/84 Applicability: All Model SD-360 Aircraft with S/Nos. referenced in Shorts Service Bulletin SD360-32-03. Document: Shorts Service Bulletin SD 360-32-03. Compliance: Unless already accomplished, before 31 May 1984. Background: It is reported that in service damage to the rear pintle pin bush has resulted in unacceptably high friction. A P.T.F.E. liner is introduced to relieve this problem.