COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 99 Series Aeroplanes AD/BEECH 99/1 Elevator Spar - Inspection and Modification 2/94 Applicability: Serial No's U-2, to U-10, U12 to U35, U37 to U60, U62 to U-65, U67, U68, U72 to U-87 and U-89. Requirement: Beechcraft Service Instruction 0190-133. Compliance: Effective 3 February 1994. Background: Cracking of low time spars at the outboard hinge bracket has been experienced in operation and the manufacturer considers the rework detailed in the Beechcraft SI necessary.