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 146/32 Centre Section Fuel Tank Coating 7/91 Applicability: Model 146 with series and constructors numbers listed in BAe 146 SB 28-18. Requirement: Action in accordance with Mandatory BAe SB 28-18. Compliance: As specified in the Requirement document. Background: Discrepancies have been found in the fuel proof polymer coating on the centre section fuel tank.