Common Traffic Advisory Frequency (CTAF), and procedures at non-controlled aerodromes AIP ENR 1.1
The CTAF is the frequency on which pilots operating at a non-controlled aerodrome should make positional radio broadcasts. If a discrete frequency is not listed use 126.7 MHz. These frequencies are not normally monitored by ATS.
To achieve the greatest degree of safety, CAR 166C requires pilots of aircraft carrying a serviceable radio which they are qualified to use, to make a broadcast whenever it is reasonably necessary to do so to avoid a collision, or the risk of a collision, with another aircraft at a non-controlled aerodrome. In certain circumstances carriage of radio and being qualified to use it are mandatory. Refer to the table on page 3.30 for report and broadcast requirements.
Pilots of higher performance aircraft, or pilots operating at busy aerodromes, are encouraged to monitor/broadcast on the CTAF earlier to allow sufficient time to gain situational awareness of the traffic.
The responsibility for collision avoidance, sequencing, and knowledge of local procedures lies solely with the pilot in command. Aircraft overflying a non-controlled aerodrome should avoid the circuit area, and the routes commonly flown by arriving and departing traffic.
Where a number of non-controlled aerodromes are in close proximity, a single discrete CTAF may be allocated to those aerodromes. Where a discrete CTAF is prescribed, these frequencies are shown in ERSA and ERC Low charts. For charted aerodromes where no specific frequencies is prescribed the default CTAF is 126.7 MHz. For uncharted aerodromes the area frequency should be used for traffic communication whenever it is reasonably necessary to do so to avoid a collision or risk of collision with another aircraft.
When a UNICOM service is provided at a non-controlled aerodrome and the UNICOM is the CTAF, ERSA identifies the frequency as CTAF/UNICOM.