Information about Ground operations audits Find out what areas of ground operations can be audited. Legislation and regulations See what legislation and regulations apply to ground operations. Ground operations inspectors Learn what ground operations inspectors do on the tarmac. Also see CAO 20.16.1 Read more about the rules in place to make sure that aircraft are safely loaded. Part 139 of CASR Learn about the requirements for aerodromes used in air transport operations. Aerodrome operations Find out about aerodrome operations, including safety management systems, lighting checks and emergency planning.