COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 56TC (Turbo Baron) Series Aeroplanes AD/BEECH 56/5 Pneumatic Pressure Regulator 2/69 Applicability: All models fitted with Beech Pneumatic De-icer System and Beech model B5 Auto- pilot. Requirement: Action in accordance with Brittain Industries Inc. SB No. 68-1 Rev. A. Note: FAA AD 68-14-1 refers. Compliance: Before 1 September 1971.