COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Meta Sokol L.40 Series Aeroplanes AD/L.40/9 Amdt 1 Wing Structural Life Limitation 2/73 Applicability: All models with wing main spar lower caps exceeding 4000 hours time in service. Requirement: Retire from service the centre section and outer wing main spar lower caps, including the centre section to outer wing attachment fittings. Compliance: 31 March 1975.