COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES General Electric Turbine Engines - CT58 Series AD/CT58/14 Lead Lag Servo Housing 9/85 Applicability: All CT58 model engines. Document: General Electric SB (CT58) A73-71 Rev. 1; or AD/GE-T/36A. Compliance: As per the requirement document. Background: This Directive is raised in issue to reflect the latest issue of the manufacturers requirement document, which adds additional inspection procedures concerning fuel controls that contain counter bores in two of the screw holes used to retain the lead lag servo housing.