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-31/8 Wing Leading Edge Stall Strips - Installation 7/69 Applicability: All models with S/Nos. 31-2 to 31-445 except the following S/Nos. 31-3, -5, -346, - 358, -367, -374, -379, -385, -407, -423, -424, -425, -429, -432, -435, -438, -440, - 441, -442, and -443. Document: Piper SB No. 294. Compliance: Within 50 hours time in service after 10 June 1969.