COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DHC-6 (Twin Otter) Series Aeroplanes AD/DHC-6/66 Stabiliser Attachment Fittings 6/92 Applicability: Model DHC-6 series, with serial numbers 3 through 820. Requirement: Action in accordance with the technical requirements of Transport Canada AD CF-92-04. Note: de Havilland SB 6/438 Rev.D and SB 6/513 refer. Compliance: As specified in the Requirement Document with a revised effective date of 21 May 1992 for Australian registered aircraft. Background: Loose horizontal stabilizer forward and aft attachment fittings have been reported on several aircraft. This Directive is issued to align with the above referenced Transport Canada AD which supersedes AD CF-83-21 (AD/DHC-6/53) and AD CF-85-10 (AD/DHC-6/59).