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 23/29 Amdt 2 Wing Main Spar Corrosion 12/86 Applicability: All 19, 23 and 24 series. Requirement: Action in accordance with Beechcraft SI No. 0824-035 Rev. II. Compliance: Prior to the issue of the next Maintenance Release after 31 December 1986 and thereafter at intervals not exceeding 12 months. Background: A history of Major Defect Reports has warranted an increase in the periodicity of this Directive to that originally called up by Beech.