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/TB10/23 Fuel Tank Internal Ribs 3/95 Applicability: TB aircraft serial numbers 1038 through 1442, 1444 through 1462, 1464 through 1581, 1583 through 1606, 1608 through 1619, and 1629; and aircraft serial numbers 1 through 1037 on which the tank rib has been repaired since the application of modification No.78. Requirement: Action in accordance with Socata Mandatory Service Bulletin 10.084.57. Note: DGAC AD 94-247(A) refers. Compliance: Within 100 hours time in service after 2 March 1995 or prior to 31 December 1995, whichever occurs first. Background: Tank sealant has been found obstructing the fuel tank internal rib drain holes. This Directive requires fuel tank internal inspections to ensure the necessary drain holes are clear.