COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes AD/DHC-8/38 ACM Delivery and Recirculation Duct Thermal Insulation 6/94 Applicability: DHC-8 aircraft, models and serial numbers as listed in the Requirement Document. Requirement: Action in accordance with Transport Canada AD CF-94-26. Note: de Havilland SB 8-21-66 Revision B refers. Compliance: Unless already accomplished, prior to 1 February 1996, or as indicated in part I.D of de Havilland Service Bulletins 8-25-89 through 8-25-93, whichever occurs later. Background: The black thermal insulation blankets that are identified in AD/DHC-8/34, have also been found to be installed on the air cycle machine delivery and recirculation ducts in the aircraft rear fuselage.