Information about airworthiness Advisory Circulars Learn about Advisory Circulars and how they are used to explain particular regulatory requirements. Airworthiness Bulletins Find airworthiness bulletins (AWBs) for airframes, avionics, engines and general advice. Airworthiness Directives Find Airworthiness Directives (ADs) for each category. Find a delegate for airworthiness service Find authorised airworthiness delegates by using our search function. Foreign airworthiness data Mandatory and non-mandatory airworthiness data issued by foreign national aviation authorities (NAA). Report and view defects Find out about the Defect Report Service (DRS), which allows you to report and view major defects. Show more Show more Show less Continuing airworthiness and maintenance and training organisations Continuing airworthiness Learn more about electing continuing airworthiness management organisations and specialist maintenance ratings. Continuing Airworthiness Management Organisations Information for CAMO's that operate under Part 42G. Maintenance organisations Information for organisations that perform maintenance under CAR 30 or Part 145. Maintenance training organisations Information for maintenance training organisations that operate under Part 147. Show more Show more Show less