COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 400 Series Aeroplanes AD/CESSNA 400/30 Main Landing Gear Upper Strut - Inspection 6/78 Applicability: All models with S/Nos. as listed in requirement document. Document: Cessna SL ME71-28. Compliance: Before issue of a Certificate of Airworthiness.