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/F50/29 Elevator and Tab Pulley Bracket - Frame 3100 13/89 Applicability: F27 Mk50 aircraft, serial numbers 20103 through 20108 and 20110 through 20152. Requirement: Action in accordance with Fokker Service Bulletin F50-27-017, dated 1 September 1989. Note: RLD BLA 89-106, dated 25 September 1989 refers. Compliance: Prior to accumulating 15000 flight cycles. Background: Fatigue tests on a test assembly of the subject pulley bracket revealed insufficient fatigue life. This AD calls for the replacement of the bracket with a redesigned one.