COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Casa 212 Series Aeroplanes AD/CASA/9 Engine Controls - Propeller Feathering System 6/87 Applicability: All model CASA-212 with S/No's referenced in the Requirement Document. Requirement: Action in accordance with CASA S.B. No. 212-76-04. Note: FAA AD No. 87-05-06 Amendment 39-5561 also refers. Compliance: Modify prior to 31 December 1987. Background: The possibility of loss of propeller control system integrity is not sufficiently remote for this class of aeroplane.