When contacting the local control unit, pilots indicate their information, where is the ATIS identification letter of the ATIS transmission the pilot received. The letter progresses through the alphabet with every update and starts at alpha after a break in service of 12 hours or more.
The recording is updated in fixed intervals or when there is a significant change in the information, e.g. Pilots usually listen to an available ATIS broadcast before contacting the local control unit, which reduces the controllers' workload and relieves frequency congestion. ATIS broadcasts contain essential information, such as current weather information, active runways, available approaches, and any other information required by the pilots, such as important NOTAMs. airports and their immediate surroundings. Automatic terminal information service, or ATIS, is a continuous broadcast of recorded aeronautical information in busier terminal areas, i.e.
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