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/F50/24 Engine Control Rod Clearance 13/89 DM Applicability: F27 MK50 aircraft with serial numbers 20103 through 20108 and 20110 through 20167. Requirement: Action in accordance with Fokker SB F50-54-006. Note: Netherlands AD 89-100 refers. Compliance: Prior to 31 December 1989. Background: Country of origin AD. Freezing of water on control rod at feedthrough hole could cause jamming.