COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 400 Series Aeroplanes AD/BEECH 400/1 Aft Fuel Tank Vent 12/92 DM Applicability: Model 400A serial number RK-1 to RK-28 inclusive. Requirement: Unless previously carried out action in accordance with the Accomplishment Instructions contained in Beechcraft mandatory service bulletin No 2445. Note: FAA AD 92-16-14 amdt 39-8323 refers. Compliance: Prior to 25 September 1992. Background: To prevent a potential fire or explosive situation a one time inspection of the aft fuselage vent system to ensure aluminium honeycomb material is installed, is required.