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Division (a) Each flight crew member required to be on duty in the flight crew compartment shall wear a headset with boom microphone or equivalent. The headset shall be used as the primary device for voice communications with ATS:

United Kingdom

Original text. Later amendments are not shown.

  1. (1)

    when on the ground:

    1. (i)

      when receiving the ATC departure clearance via voice communication; and

    2. (ii)

      when engines are running;

  2. (2)

    when in flight:

    1. (i)

      below transition altitude; or

    2. (ii)

      10 000 ft, whichever is higher;

    and

  3. (3)

    whenever deemed necessary by the commander.