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Other traffic on your current frequency transmits a distress call to ATC. You must not transmit on the frequency unless…

  • A
    the other traffic is flying above your altitude.
  • B
    you can render assistance.
  • C
    you are requesting to descend to the destination.
  • D
    you are requesting weather information.

ICAO Annex 10, Volume II
5.3.2 Radiotelephony distress communications

5.3.2.4 Action by all other stations

5.3.2.4.1 The distress communications have absolute priority over all other communications, and a station aware of them shall not transmit on the frequency concerned, unless:

a) the distress is cancelled or the distress traffic is terminated;
b) all distress traffic has been transferred to other frequencies;
c) the station controlling communications gives permission;
d) it has itself to render assistance.

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