Communicationsmedium#1257
Before assuming total communication failure, the pilot should attempt:
A
All available means including other frequencies, other aircraft relay, ACARS, CPDLC, and 121.5 MHz
CorrectB
Nothing; immediately squawk 7600
C
Only try the last assigned frequency twice
D
Contact company operations only
Explanation
Before declaring communication failure, pilots should attempt all available communication means: other frequencies, relay through other aircraft, data link, and 121.5 MHz.
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