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A Cockpit Voice Recorder must record…

  • A
    flight data, voice or audio signals identifying navigation or approach aids introduced into a headset or speaker and voice communications: transmitted from or received in the aeroplane by radio, and of flight-crew members on the flight deck.
  • B
    voice or audio signals identifying navigation or approach aids introduced into a headset or speaker and voice communications: transmitted from or received in the aeroplane by radio, of flight-crew members on the flight deck, of flight-crew members on the flight deck using the aeroplane`s interphone system, and of flight-crew members on the flight-deck using the public address system (if installed).
  • C
    voice or audio signals identifying navigation or approach aids introduced into a headset or speaker and voice communications: transmitted from or received in the aeroplane by radio, of flight-crew members on the flight deck, of flight-crew members on the flight deck using the aeroplane`s interphone system including calls between cabin crew stations (if installed), and of flight-crew members on the flight-deck using the public address system (if installed).
  • D
    voice or audio signals identifying navigation or approach aids introduced into a headset or speaker and data recording flight and engine parameters.

Refer to figure.
The purpose of a Cockpit Voice Recorder is to preserve, in the event of an accident, vital audio information that is recoverable for use by accident investigators. Only the last 2 hours of recording are retained. The whole system consists of a remote microphone situated in the cockpit, a hot mike function that records the pilots’ transmissions directly from their microphone, a crashproof recorder equipped with an underwater locating beacon (in the aft section of the aircraft), a control panel to make the necessary selections and set up the system. The control panel has also an event button that marks a recording when it’s pressed, enabling this event to be found rapidly at a subsequent analysis.
The CVR is energized automatically:

    • In flight,
    • On the ground with one engine running.

According to CS-25, a CVR must record:

  • Communications transmitted from or received in the airplane by radio,
  • Communications of flight-crew members and aural environment on the flight deck via the area microphone, remotely located behind the overhead panel in most of the aircraft (refer to figure).
  • Communications of flight-crew members on the flight deck using the airplane`s interphone system,
  • Audio or voice signals identifying navigation or approach aids introduced into a headset or speaker.
  • Flight-crew members on the flight deck using the public address system (if installed).

Note : The CVR doesn’t record the communication between the flight attendant’s stations.

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