Real Dictionary

flight recorder
countable noun: On an aeroplane, the flight recorder is the same as the black box.

flight recorder in American English
an electronic module, designed to survive a crash, fire, etc., that records flight data, as altitude, airspeed, and aircrew conversations
noun: an electronic device aboard an aircraft that automatically records some aspects of the aircraft's performance in flight

flight recorder in British English
noun: an electronic device fitted to an aircraft for storing information concerning its performance in flight. It is often used to determine the cause of a crash