The Manual of Air Traffic Services contains procedures, instructions and information which are intended to form the basis of air traffic services within the United Kingdom. It is published for the guidance of civil air traffic controllers and may also be of general interest to others associated with civil aviation.
Edition 11 becomes effective 28 December 2023.
Supplementary Instructions (SIs) to CAP 493 are periodically issued ahead of routine amendments to introduce an entirely new subject, a radical change to existing instructions or to re-emphasise an existing instruction. CAP 493 should be read in conjunction with these Supplementary Instructions.