A device which records data on the functioning of an aircraft and its systems on tape or wire. The flight data recorder FDR should be in a crashproof, floatable box which may be ejected in case of an accident, and is usually fitted with a homing radio-beacon and flashlight. 2 The cockpit voice recorder CVR stores all speech between crew on the flight deck, and between crew and ground air traffic control. 3 The maintenance data recorder receives data from hundreds of inputs from engineering systems. Colloq black box frequently a misnomer,

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