COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Skyfox Aviation (Calair/Hedaro) CA21 and CA22A Series Aeroplanes AD/CA21/4 Tail Wheel Springs 1/96 Applicability: CA21 and CA22A aircraft. Requirement: Inspect the tail wheel springs for deformation in accordance with Skyfox Aviation Service Bulletin No.8. Compliance: Before the first flight of each day after 4 January 1996. This Directive must be entered onto the Maintenance Release as maintenance required. The inspection may be performed by the pilot in command, in which case a certification is to be made by entering AD/CA21/4 against the Daily Inspection certification on the Maintenance Release. A copy of this Directive and of the Requirement Document must be carried in the aircraft. Background: Several instances have been reported of fractured tail wheel springs. This AD requires the tail wheel springs to be inspected on a daily basis by the pilot, with replacement of the springs if deformation is discovered.