COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Embraer EMB-110 (Bandeirante) Series Aeroplanes AD/EMB-110/46 Rudder Trim Tab Actuator System 2/92 TX Applicability: All models. Requirement: Action in accordance with the technical requirements of Brazilian Airworthiness Directive T91-11-01. Note: Embraer SB 110-27-0091 refers. Compliance: Within 10 hours time in service after 11 December 1991. Background: This Directive requires visual inspection of the tab system. Incorrect installation of rudder trim tab system has caused failure of tab rods on at least two occasions. This condition may cause severe vibration and control difficulties.