COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Casa 212 Series Aeroplanes AD/CASA/2 Engine Firewall Sealing 12/82 Applicability: Model 212 with S/Nos. as detailed in Casa SB No. 212-73-03, Rev. 1. Document: Casa SB No. 212-73-03, Rev. 1. Compliance: If not already accomplished within 100 hours time in service after 31 December 1982. Background: Manufacturer's requirement to improve fireproofing at the engine firewall.