COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes AD/TB10/24 Fin Intermediate Rib Attachment 3/95 Applicability: Model TB9, TB10 and TB200 aircraft with serial numbers 1 through 1609. Requirement: Action in accordance with Socata Mandatory Service Bulletin 10.083.55. Note: DGAC AD 94-248(A) refers. Compliance: Unless already accomplished, as specified in the Requirement Document. Background: The fin intermediate rib attachment rivets have been found to be susceptible to working, and loosening as a result.