Regulation (EU) No 800/2013
(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:
(1) when on the ground:
(i) when receiving the ATC departure clearance via voice communication; and
(ii) when engines are running;
(2) when in flight:
(i) below transition altitude; or
(ii) 10 000 ft, whichever is higher;
and
(3) whenever deemed necessary by the pilot in command.
(b) In the conditions of (a), the boom microphone or equivalent shall be in a position that permits its use for two-way radio communications.
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