D-ATIS is a text-based, digitally transmitted version of the ATIS audio broadcast. Many airports also employ the use of Data-link ATIS (D-ATIS). This helps the ATC controller verify that the pilot has all current information.
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. Additionally, ATIS may contain Man-Portable Air Defense Systems (MANPADS) alert and advisory, reported unauthorized laser illumination events, instrument or visual approaches in use, departure runways, taxiway closures, new or temporary changes to runway length, runway condition and codes, other optional information, and advisories.
If it exists, the weather observation includes remarks of lightning, cumulonimbus, and towering cumulus clouds. In the US, ATIS will include (in this order): the airport or facility name a phonetic letter code time of the latest weather observation in UTC time weather information consisting of wind direction and velocity, visibility, obstructions to vision, sky condition, temperature, dew point, altimeter setting, density altitude advisory if appropriate and other pertinent remarks, including runway in use. 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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