COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F28 Series Aeroplanes AD/F28/57 Frame 1600 Centre Bracket 9/94 CANCELLED. Background: This Directive required inspection for fatigue cracks, and repair or replacement of the frame 1600 centre bracket. As the initial and repeat inspections for this bracket have since been incorporated in the F28 Structural Integrity Program (under Item 53-10- 21), which is covered by AD/F28/45, there is no longer a requirement for AD/F28/57.