COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Dornier DO-27 Series Aeroplanes AD/DO-27/1 Steel Band Tensioners - Replacement 8/61 Applicability: All models Q-1, Q-3, Q-4 and H2. Requirement: 1. Replace the steel band tensioners (Drawing No. 27-404-01 H02) with tension chains (Drawing No. 27-416-01 H02). 2. SB No. 27/11 dated 22 February 1961, issued by Dornier-Merke G.m.b.H Munchen-Neuaubing, Federal Republic of Germany, covers the modification work required. or 3. LBA AD 6.27. Compliance: Before 1 September 1971.