COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 150, F150, 152 & F152 Series Aeroplanes AD/CESSNA 150/21 Wing Strut Attachment Strap 10/73 Applicability: Model 150 with S/Nos. 15074635 to 15074799 and Model A150 with S/Nos. A1500415 to A1500427. Requirement: Action in accordance with Cessna SL SE 73-20. Compliance: Within 100 hours time in service after 24 September 1973.