Regulations > Civil Aviation Regulations, 2011 > Part 121 : Air Transport Operations - Carriage on Aeroplanes of more than 19 Passengers or Cargo > Subpart 5 : Aeroplane Instruments and Equipment

Civil Aviation Act, 2009 (Act No. 13 of 2009)

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All flight crew members required to be on flight deck duty shall communicate through boom or throat microphones below the transition level/altitude.