COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 146 Series Aeroplanes AD/BAe 146/20 Avionics Rack Earth Stud 9/90 Applicability: All BAe 146 series aeroplanes as detailed in the Requirement Document. Requirement: Action in accordance with BAe 146 Service Bulletin 24-60. Note: Compliance with this Service Bulletin has been classified mandatory by the UK CAA. Compliance: Prior to 6 November 1990. Background: BAe have advised that one operator has experienced chafing of an electrical loom on this earth stud.