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 146/12 Amdt 1 Elevator `G' Weight Damper 6/89 Applicability: All models with S/Nos referenced in the Requirement document. Requirement: Action in accordance with BAe SB 27-77-00955 A & C Rev 2. Compliance: Prior to 30 September 1989. Background: This AD contains two concurrent modifications. One to overcome control column oscillation at 2.5 Hz and the other to increase stick centring force following an autopilot cutout. Amendment 1 requires additional work, includes other series aircraft and includes variations dependent on modification state.