COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 99 Series Aeroplanes AD/BEECH 99/6 Wing Structural Fatigue Limitations 12/96 Applicability: All model 99 aircraft. Requirement: Inspect and retire the wing structural components in accordance with the Beechcraft 99 Airliner Series Continued Airworthiness Program Inspection Manual P/N 98- 30131 Rev. A1, Sections 57-10 and 57-20. Note: FAA AD 92-15-13 refers. Compliance: This Directive takes effect 7 November 1996. Background: This Directive requires life limited components to be retired to prevent fatigue failure of the wing spar and associated structure.