Engineering Services The engineering section is a Transport Canada approved airworthiness engineering organization with the authority to approve changes to aeronautical product type design, modification design, and repair design in all aircraft maintained at ASD. This section provides engineering and drafting services and is responsible for: a. avionics and structural design changes; b. project management of prototype and production installations; c. making findings of compliance to the prescribed standards of airworthiness; and d. establishing instructions for continuing airworthiness to enable maintenance personnel to service the aircraft.