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Complete the following sentence:

A Controller receives a (1)_____ call that takes priority over all other messages and instructs all other stations to (2)_____.

  • A
    (1) MAYDAY; (2) change frequency.
  • B
    (1) PAN PAN; (2) stop transmitting.
  • C
    (1) PAN PAN; (2) change frequency.
  • D

    (1) MAYDAY; (2) stop transmitting.

Distress messages have priority over all other transmission, and urgency messages have priority over all transmissions except distress messages.

The station in distress, or the station in control of distress traffic, shall be permitted to impose silence, either on all stations of the mobile service in the area or on any station which interferes with the distress traffic. It shall address these instructions “to all stations”, or to one station only, according to circumstances. In either case, it shall use:

— STOP TRANSMITTING;
— the radiotelephony distress signal MAYDAY. - ICAO Annex 10, Part 5

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