COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F50 (F27 Mk 50) Series Aeroplanes AD/F50/31 Accessory Compartment Cable Covers 2/90 DM Applicability: F27 Mk50 with S/Nos 20103 through 20108 and 20110 through 20134, in post Fokker SB F50-27-010 configuration. Requirement: Action in accordance with Fokker SB F50-27-024. Note: Netherlands AD 89-99 refers. Compliance: Unless already accomplished - prior to 31 March 1990. Background: Country of origin AD. Water draining from covers may splash onto control cables and freeze, causing control difficulty.