COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Airparts (NZ) Ltd. FU 24 Series Aeroplanes AD/FU24/48 Tailplane Mass Balance Weight and Control Horn - Inspection and Modification Applicability: All models fitted with piston engines. Document: Aerospace SB ASB/FU/005. 5/75 Compliance: Inspect before 30 April 1975. Modify, where necessary, before 31 May 1975. Note: Aircraft with an incorrectly balanced tailplane may continue in service until modified.