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 146/18 Pylon to Engine Front Mount Yoke Bush 2/90 Applicability: Series 200 S/No. E2106, E2111, E2115, E2121 and E2127. Series 300 S/No. E3128, E3131 and E3134. Requirement: Action in accordance with BAe SB 54-4. Compliance: In accordance with the Requirement Document. Background: There has been a report of the subject bush being found incorrectly installed.