İndicator- something which shows information Descend

Receive- to get, to obtain

Cockpit Voice Recorder- a device used to record the audio environment in the flight deck for accidents and incident investigation purposes.

Flight data recorder- an electronic device located in the tail section of an aircraft that picks up and stores data about a flight.

Recording- writing or of picking up and storing information

Determine- define

Airliner- an aeroplane designed to carry large numbers of passengers

Memory- the ability to store

Data-information

Crash- an accident that causes damage

Underwater Locating Device- is an underwater acoustic locating device designed to survive the impact of an aircraft crash.

Tone- a sound of one pitch

Switch- a device to open an electric current

Storage- storing something