COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 19, 23 and 24 Series Aeroplanes AD/BEECH 23/8 Flight Instruments Static System 7/65 Applicability: Model 23 with S/Nos. M-1 to M-334 except M-62. Requirement: Action in accordance with Beechcraft SB Model 23 No. 7. Compliance: Before 30 September 1971.