COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-32 (Cherokee Six) Series Aeroplanes AD/PA-32/56 Steering System - Modification 5/78 Applicability: All models PA-32-260 and PA-32-300 with S/Nos. 32-7400001 to 32-7400050, 32- 7440001 to 32-7440086, 32-7440088 to 32-7440160. Document: 1. Piper SB No. 428; or 2. FAA AD 74-18-13 Amendment 39-1939. Compliance: Unless already accomplished, within 100 hours time in service after 30 April 1978.