Commonwealth Consolidated Regulations Commonwealth Consolidated RegulationsIf an airworthiness directive issued under regulation 37A of CAR, or such an airworthiness directive as subsequently varied, had effect immediately before 1 January 2000, then, subject to these Regulations, the airworthiness directive, or the airworthiness directive as varied, continues to have effect on and after that day as if it were an airworthiness directive issued by CASA under regulation 39.001.