COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES CFM International Turbine Engines - CFM56 Series AD/CFM56/6 Fan Blade 4/97 Applicability: CFM International (CFMI) CFM56-3B-2 and CFM56-3C-1 engines. Requirement: Action in accordance with the technical requirements of FAA Airworthiness Directive 96-25-11. Installation of fan blades incorporating 37 Deg midspan shrouds per CFMI Service Bulletin (CFM56-3/-3B/-3C) 72-543 is terminating action for the thrust limitations imposed by this Directive. Note: A flight manual amendment may be required depending on engine fan blade modification status. Compliance: Effective 27 March 1997, as specified in the Requirement Document. Background: This Directive is raised to remove from service certain fan disc and fan blade hardware, to impose limits on thrust levels on certain engine configurations, and introduce new fan blade hardware that will remove limitations on thrust levels. These measures are intended to prevent a fan blade failure that could result in complete loss of engine power.