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 146/56 Aileron Servo and Trim Tab Drive Brackets 12/95 DM Applicability: All Series BAe 146 aircraft. Requirement: Action in accordance with Avro International Aerospace Mandatory Service Bulletin 57-47. Compliance: As specified in the requirement document with the initial inspection before 28 September 1995. Background: The manufacturer received a report of corrosion on the bracket surface between the two tab drive flanges in the area of the two attachment bolts. This has given rise to cracking of the flanges at their base in severe corrosion cases.