COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes AD/TB20/9 Main Landing Gear Bay 7/87 Applicability: All models S/Nos 275 to 709. Requirement: Action in accordance with Aerospatiale Socata SB No 30. Note: Bureau Veritas AD 87-030(A) refers. Compliance: At the next scheduled inspection for Maintenance Release issue after 30 June 1987. Background: The manufacturer reports the possibility of the main landing gear contacting the landing gear bay structure.