AD/A320/18 - Trimmable Horizontal Surface Relay

Airworthiness Directive - AD/A320/18 - Trimmable Horizontal Surface Relay Airworthiness Directive - AD/A320/18 - Trimmable Horizontal Surface Relay CASA Airworthiness Directive Jurisdiction:Commonwealth of Australia;CorporateName:Civil Aviation Safety Authority; Issue 9/1991,Aircraft above 5700 kg,Airbus Industrie A319, A320 and A321 Series Aeroplanes,Trimmable Horizontal Surface Relay,18 DellaCa, Donna 2 0 2022-10-26T23:07:00Z 2022-10-26T23:07:00Z 1 206 1175 Office of Parliamentary Counsel 9 2 1379 16.0000 2006-09-22T00:00:00Z Toolkit http://www.activepdf.com 2022-10-26T00:00:00Z COMMONWEALTH OF AUSTRALIA   (Civil Aviation Regulations 1998) , PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES   Airbus Industrie A319, A320 and A321 Series Aeroplanes   AD/A320/18   Trimmable Horizontal Surface Relay   9/91 Applicability:   All Airbus Industrie A320 aircraft without Airbus Industrie Modification 21659 or Airbus Industrie Service Bulletin A320-27-1012 embodied.   Requirement:   Action in accordance with the Technical Requirements of DGAC AD 91-119-017(B) R1.   Note: Airbus Industrie Service Bulletin A320-27-1012 also refers.   Compliance:   1. For aircraft which have performed more than 1400 flights or more since retrofit of SEC P/N B372ABM0606/B372BAM0404 - at the earliest opportunity, but before exceeding 1600 flights since retrofit of the SEC P/No referenced above.   2. For aircraft which have performed less than 1400 flights or more since retrofit of SEC P/N B372ABM0606/B372BAM0404 - at the earliest opportunity, but within 800, but not exceeding 1600 flights following retrofit of the above referenced SEC.   Background:   Relay 36 CE 3, which is energised by SEC 2 whenever it is active in pitch mode, has been found, in one case, to be stuck in the energised position. This affects the ability of the SEC 2 monitoring channel to neutralise any erratic movement of the THS initiated by the SEC 2 control channel.