Doug_or From United States of America, joined Mar 2000, 3408 posts, RR: 3
Reply 1, posted (11 years 7 months 2 days 12 hours ago) and read 2969 times:
Its is the ATIS they have. Bascialy, every hour (or more often if conditions warrant) the controlers record a message with information regarding the airport's current conditions. at the end of the message it says "advise on intial contact you have _". this lets the controllers know you have the most up to date conditions. if you don't they will either give the changes to you over the frequency, or tell you to go get your own damn self.
Airplay From , joined Dec 1969, posts, RR:
Reply 2, posted (11 years 7 months 2 days 12 hours ago) and read 2969 times:
Airports broadcast an Automated Terminal Information System (ATIS) that alerts pilots to relevent information such as the active runway, altimeter settings, weather, NOTAMS etc. The recorded ATIS message repeats continuously.
ATIS messages are assigned a letter (Alpha, Bravo, Charlie etc...) that allows ATC to determine how "fresh" the pilot's information is. If the pilot says he has "information Tango" but the latest ATIS message was "Sierra", ATC may want to update the pilot.
OPNLguy From , joined Dec 1969, posts, RR:
Reply 3, posted (11 years 7 months 2 days 12 hours ago) and read 2962 times:
They're refering to the ATIS broadcast. ATIS stands for automated terminal information service, which is nothing more than a short-loop tape recording made by ATC tower personnel (usally, once an hour) that contains airport weather, runways and approaches in-use, and any notices to airmen (NOTAMS about closures, inop navaids, etc. Each time the ATIS tape is updated, it gets a sequential identifier (Alpha, Bravo, etc.) to distinguish it from the previous one.
When pilots mention to ATC that they have information "whatever", they're saving ATC from repeating the same info over and over again on the radio, and it also allows ATC to know whether a crew has stale info, i.e. a crew calls in with "Charlie" but that "Delta" is now current. (Updated after the crew checked and got "Charlie).