The Standards branch includes divisions responsible for the development and revision of standards related to operational airworthiness, safety management systems, aircraft certification, air operators certification & flight operations, aerodromes & air navigation, aviation occupational health & safety and general aviation. It also includes enforcement, safety promotion and education for the aviation industry. The Standards branch manages and publishes the Transport Canada Aeronautical Information Manual (TC AIM) as well as the Aviation Safety Letter (ASL).