From Longman Dictionary of Contemporary Englishflight recorderˈflight reˌcorder noun [countable] TTSa piece of equipment in an aircraft that records details such as the plane’s speed and direction SYN black box
Examples from the Corpus
flight recorder• Accident investigators have found the black box flight recorder.• The small flight recorder section is headed by an Assistant principal Inspector.• There remain the specialists who look after the flight recorder side of aircraft accident investigation. 