COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 185 Series Aeroplanes AD/CESSNA 185/7 Amdt 1 Wing Main Spar and Lower Skin 10/67 Applicability: All models in agricultural category. Requirement: Carry out a visual inspection for cracking of the wings in the following areas: 1. The corners of the skin cutouts through which the lift strut fork passes. 2. All visable elements of the main spar lower flange front and rear faces in the region of the lift strut attachment. Pay particular attention to the areas around the spar to skin rivets. The affected areas must be thoroughly cleaned before inspection. Compliance: Before 4000 hours total time in service on wings and thereafter at intervals not exceeding 100 hours time in service.