COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Rolls Royce Turbine Engines - RB211 Series AD/RB211/13 Thrust Reverser Functional Test 6/91 Applicability: All RB211-524G and 524H engines not incorporating the requirements of Rolls Royce Service Bulletin RB211-78-9347. Requirement: Action in accordance with the requirements of Rolls Royce Mandatory Service Bulletin RB211-78-9274. Compliance: As detailed in Requirement Document. Background: This Directive requires a functional test to be carried out following any abandoned take-off where the thrust reversers have been deployed. This requirement reflects advice that following an abandoned take-off, thrust reverser operation times may become extended (10 seconds or more).