ATF, UNICOM & runway status

An aerodrome traffic frequency (ATF) is the self-announce frequency at an uncontrolled aerodrome with no mandatory frequency (MF).

• No MF published: self-announce on the ATF, broadcast intentions at the same points (TC AIM RAC 4.5).
• MF: calls compulsory. ATF: just the frequency to announce on.
• Listening watch on the ATF works the same way (TC AIM RAC 4.5.1).

Which frequency:

Coverage and equipment:

• ATF can cover a corridor between two uncontrolled aerodromes, not just the ring around one. Specified in CFS or AIP Canada Supplement (RAC 4.5.5).
• Aerodromes without an MF do not require two-way radio. Watch for traffic not calling in.

UNICOM (TC AIM RAC 1.2.1):

• Private agency air-ground facility at uncontrolled aerodromes.
• Operates on one of (MHz): 122.7, 122.8, 123.0, 123.3, 123.5, 122.35, 122.95, 123.35, 122.725, 122.775, 122.825.
• Passes traffic and field information.
• Not ATC. No clearances.
• Using its information is entirely pilot's call. TC takes no responsibility for use of a UNICOM frequency.

Runway status on an ATF: the vehicle operator, if there is one.

• Radio-equipped vehicle on field: contact operator on the ATF for runway status and other traffic (RAC 4.5.1).
• Operator is trained and radiotelephone-licensed (RAC 4.5.5).
• Operator gives vehicle positions, other aircraft positions on the manoeuvring area, runway condition if known.
• Operator issues no instructions or clearance (RAC 4.5.5).
• No reply (NORDO) from UNICOM or vehicle operator, or runway condition unknown: pilot visually confirms the runway before landing or taking off (RAC 4.5.5).

Trap: silence on the ATF does not mean empty area; a NORDO aircraft may be operating there legitimately. No answer means confirming the runway is your job.

Practice