NAA Airworthiness Directives Find mandatory Airworthiness Directives (AD) issued by other national aviation authorities. NAA airworthiness notices Find airworthiness advice and notices issued by other national aviation authorities. Also see Australian Airworthiness Bulletins Airworthiness Bulletins (AB) issued by us. Australian Airworthiness Directives Airworthiness Directives (AD) issued by us. Australian Defect Report Service Report and view major defects with aircraft or an aircraft part not fitted to an aircraft.
