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 146/34 Anti-Skid Control System 10/91 Applicability: As specified in the Requirement Document. Requirement: Action in accordance with BAe SB 32-124-70491A&B. Note: Compliance with this SB is classified MANDATORY by the UK CAA, and includes mandatory modification of Anti Skid Control Boxes held as spares. Compliance: Prior to 30 June 1992. Background: A loss of normal braking has been reported which has been attributed to incorrect operation of the Anti Skid Control Box which may result in a single fault causing failure of the normal breaking system.