COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Piper PA-31 Series Aeroplanes AD/PA-31/56 Aircraft Data Plate - Inspection and Replacement 7/77 Applicability: Model PA-31 and PA-31-310 with S/Nos. 31-7401201 to 7401268, 31-7512001 to 31-7512072, 31-7612001 to 31-7612088. Document: Piper SB No. 529. Compliance: Within 100 hours time in service after 31 July 1977.