COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F27 Series Aeroplanes AD/F27/111 Reduced Span Rudder Trim Tab 12/86 Applicability: All model F27 with S/Nos. 10102 to 10684; 10686, 10687 and 10689 to 10692. Requirement: Action in accordance with Fokker S.B. F27/55-62. Note: RLD BLA 86-53 refers. Compliance: Prior to 31 March 1988. Background: This modification alleviates most of the problems associated with the previous design rudder trim tab.