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-31/36 Elevator Control Tube - Inspection 2/75 Applicability: All models PA-31 and PA-31-300 with S/Nos. 31-1 to 31-7401248; and PA-31-350 with S/Nos. 31-5001 to 31-7405242 and 31-7405400 to 31-7405462. Document: Piper SB No. 433. Compliance: Within 100 hours time in service after 28 February 1975.