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 23/19 Amdt 1 Fuel and Oil Pressure System 12/71 Applicability: Models A23A, B23 & C23 with S/Nos. M-1069 to M-1310; Models 19A, M19A & B19 with S/Nos. MB-289 to MB-500; Models A23-24 and A24 with S/Nos. MA-273 to MA-368; and Model A24R with S/Nos. MC-3 to MC-72 except MC-22, MC-23, MC-39, MC-43, MC-63, MC-64 and MC-71 and aircraft produced prior to the above S/Nos. which have had the original line(s) replaced with the 130524-3 fire sleeved lines. Requirement: Action in accordance with Beechcraft SI No. 0411-240. Note: Compliance with a previous issue of this Directive constitutes compliance with this issue. Compliance: Within 100 hours time in service after 31 December 1977.