Automatic Terminal Information Service
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Automatic Terminal Information Service, or ATIS, is a continuous broadcast of recorded noncontrol information in busier terminal (i.e. airport) areas. ATIS broadcasts contain essential information, such as weather, active runway, and altimeter settings. Pilots usually listen to an available ATIS broadcast before contacting the local control tower, in order to reduce the controllers' workload and relieve frequency congestion. The recording is typically updated once an hour, and is generally given a letter designation (e.g. bravo), from the Aviation Alphabet. When contacting the control tower, a pilot will indicate he/she has "information bravo" to let the controller know that the information need not be repeated.
On tuning to an ATIS frequency, a pilot might hear
Palo Alto Airport, Information Bravo. One three five five zulu. Weather, wind three zero zero at eight, visibility five statute miles, ceiling six thousand overcast, temperature one five, dew-point eight. Altimeter two niner niner seven. IFR approach is PAR. Landing and departures, runway three one. Runway surface condition is dry. GPS approaches available. Contact ground control with departure requests before taxi. Advise you have information bravo.
External links
UK ATIS frequencies (http://www.javiation.co.uk/vu.html)nl:ATIS zh:自动终端情报服务