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The International VHF Emergency Frequency is

A121.5 MHz.Correct answer
B121.9 MHz.
C122.2 MHz.
D126.7 MHz.

Why this is the answer

The international VHF aeronautical emergency frequency is 121.5 MHz (TC AIM-COM; CAR 602.143). The other frequencies are en-route/ATF channels, not the emergency guard frequency.

Reference

CFS Emergency Section TC AIM-COM – Emergency Communications CARs 602.143 – Emergency Radio Frequency Capability

Question reproduced verbatim from Transport Canada’s PSTAR Study and Reference Guide (TP 11919E). The answer key is Transport Canada’s; the explanation is ours.

A study aid — not a substitute for the official guide, the CARs, or your instructor.

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