Aerodrome Traffic Frequency

An Aerodrome Traffic Frequency (ATF) is a designated radio frequency for use by aircraft operating in the vicinity of an aerodrome that does not have a control tower or Mandatory Frequency (MF). All pilots operating within a specified radius (typically 5 NM) and below a specified altitude (typically 3,000 ft AGL) must broadcast their intentions and position on the ATF.

ATF vs. Mandatory Frequency (MF)

An ATF is self-announced — pilots broadcast their intentions but are not required to establish two-way contact before proceeding. An MF area requires pilots to monitor the frequency for any advisory service being provided. At MF aerodromes, an FSS or CARS is typically monitoring the frequency; at ATF aerodromes, no ground facility is listening.

Standard ATF Broadcasts

• When 5 NM from the aerodrome: announce intentions and inbound position
• When joining the circuit: downwind, base, final
• After landing: clear of the runway
• When taxiing for departure: intentions and runway

Related Terms

See also: Mandatory Frequency (MF), CARS, Aerodrome Traffic Zone.