COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 90 and 65-90 (King Air) Series Aeroplanes AD/BEECH 90/83 Aft Fuselage Drainage 8/90 Applicability: Models 65-90, 65-A90, B90, C90 and C90A with S/Nos LJ-1 through LJ-1222. Models E90, F90, H90 all S/Nos. Requirement: Action in accordance with Beechcraft Mandatory SB 2312. Note: FAA AD 90-08-17 refers. Compliance: Unless already accomplished, prior to exceeding 100 hours' time in service after 9 August 1990, or at the next scheduled inspection for issue of Maintenance Release after 9 August 1990, whichever occurs later. Background: Country of origin AD. A blocked drainage system may allow water to accumulate, freeze and restrict movement of the flight controls.