Local Airport Advisory (LAA)
When a flight service station is physically located at an airport, that flight service station may provide local airport advisory service when the airport's control tower is closed. The FSS provides winds, altimeter setting, runways in use, notices to airmen, and advises the pilot of known traffic in the area.
To use the LAA service, request an airport advisory when about 10 miles from the airport, if arriving. If departing, request the advisory upon taxi out. When making a radio broadcast to a flight service station, refer to the FSS as, "Radio".
Examples:
"Lexington radio, Mooney one two four papa kilo, one zero miles to the north, at three thousand five hundred, landing Lexington, request airport advisory."
"Lexington radio, Mooney one two four papa kilo, ready to taxi, departing VFR to the north, request airport advisory".
The flight service station would respond to these requests by providing pertinent information and traffic advisories.
Unicom
Unicom is a privately operated radio, used to provide pilots airport advisories. Unicom is often used at larger airports for the coordination of services, such as maintenance, fuel, and parking arrangements. At smaller airports, unicom is often used by pilots to receive airport advisory information and make service requests.
Examples:
"Marshall Unicom, Mooney one two four papa kilo, one zero miles to the north, at three thousand five hundred, landing Marshall, request airport advisory."
"Marshall Unicom, Mooney one two four papa kilo, taxiing to runway three six, request airport advisory."
Multicom
Where there is no tower, FSS, established CTAF, or unicom for an airport, pilots should use the multicom frequency, 122.9 MHz, for self-announce procedures.