(4)
At airports where a frequency other than 126.7 MHz has been designated as the MF, arriving pilots shall first broadcast their intentions on 126.7 before changing to the MF. If conflicting IFR traffic becomes evident, this change should be delayed until the conflict is resolved. Pilots departing IFR shall broadcast their intention on 126.7 MHz in addition to the MF prior to take-off. It is strongly recommended that 126.7 MHz be monitored along with the MF if the aircraft is equipped with dual radios.
(5)
The preceding reporting requirements are considered the minimum necessary. Pilots are encouraged to make additional reports whenever the possibility of conflicting IFR traffic is suspected. For example, reporting prior to overflying a facility where cross traffic is probable or where there is a published Instrument Approach Procedure.
NOTE: There is no frequency comparable to 126.7 for use by UHF only equipped aircraft. However, pertinent UHF traffic will be relayed on the MF by the Flight Service Specialist.
(NAV CANADA/AIP SUP 3/02)
6. MANDATORY FREQUENCY - NAV Canada has designated a Mandatory Frequency (MF) for use at selected uncontrolled airports or airports that are uncontrolled between certain hours. Specified reporting procedures shall be followed as detailed below. There may or may not be a ground station in operation at the airport for which the MF area has been established. When a ground station is in operation, all required aircraft reports shall be directed to the ground station. However, when the ground station is not in operation, all required aircraft reports shall be broadcast. The MF will normally be the frequency of the ground station that provides the air traffic advisory services for the airport. For the airport with an MF, the specific frequency, distance and altitude within which MF procedures apply will be published in the GPH 205.
a. AIRPORT TRAFFIC FREQUENCY - An Airport Traffic Frequency (ATF) is normally designated for active uncontrolled airports that do not meet the criteria for an MF; however, aircraft reporting procedures are virtually identical to MF procedures. The ATF is established to ensure that all aircraft operating on the ground or within the specified area are listening on a common frequency and following common reporting procedures. The specific frequency, distance and altitude within which use of the ATF is required will be published in the GPH 205. The designation of an ATF is not limited to airports only. An ATF may also be designated for use in certain areas other than the area immediately surrounding the airport, where VFR traffic activity is high, and there is a safety benefit to ensuring that all traffic monitor the same frequency. When such an area is designated, it will be specified in the GPH 205.
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