COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Short SD3-30 Series Aeroplanes AD/SD3-30/4 Fuselage Frame at Station 340.46 - Modification 12/81 Applicability: All model SD-330 with S/Nos. referenced in Shorts SB No. SD3-53-43 or with S/Nos. referenced in subsequent issues or revisions of that SB. Document: Shorts SB NO. SD3-53-43. Compliance: Within 400 hours time in service after 31 December 1981. Background: Manufacturers inspection of production aircraft has revealed omission of reinforcing plates.