COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 36 (Bonanza) Series Aeroplanes AD/BEECH 36/39 Cabin Fresh Air Blower 12/91 Applicability: Model A36 with serial numbers E-1809 through E-2592. Model A36TC and B36TC with serial numbers EA-192 through EA-514. Requirement: Action in accordance with the Technical Requirements of FAA AD 91-20-08 Amdt 39-8042. Note: Beech SB 2380 refers. Compliance: As specified in the requirement document with a revised effective date of 12 December 1991 for Australian registered aircraft. Background: Reports have been received of air blower housing attachment failures. This condition could lead to blower impingement on the flight control cables located below the blower. The effective date required by the FAA is extended by approximately one month.