COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES DHC-2 (Beaver) Series Aeroplanes AD/DHC2/23 Amdt 1 Stabilising Fins 8/91 Applicability: Model DHC-2 Mk I and Mk II Beaver aircraft equipped with EDO Model 679-4930 floats; or floats or amphibious floats listed in Type approval Number A-22, at Issue 20, but not equipped with fins as specified in the Requirement Document. Requirement: Action IAW the Technical Requirements of Transport Canada AD CF-83-09 R2. Compliance: Unless already accomplished; prior to further flight after 8 August 1991. Background: Flight tests indicate that a DHC-2 Beaver Mk I or Mk II equipped as a floatplane or an amphibious floatplane, may exhibit hazardous adverse directional stability when not equipped with fins as specified. This amendment is raised in response to Revision 2 of the Requirement Document, which has been issued to combine AD CF-76-15 (25 Aug 76) and AD CF-83-09 R1 (2 Mar 89), and to include wipline ventral fin and stabilising fins.