Both recorders are installed in the most crash survivable part of the aircraft, usually the tail section. Each recorder is equipped with an Underwater Locator Beacon (ULB) to assist in locating in the event of an overwater accident.
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In the event of a crash at sea, flight recorders are equipped with a sonar device that is designed to emit an ultrasonic locator signal for at least 30 days.
Flightradar24 combines data from several data sources including ADS-B, MLAT and radar data. The ADS-B, MLAT and radar data is aggregated together with schedule and flight status data from airlines and airports to create a unique flight tracking experience on www.flightradar24.com and in Flightradar24 apps.
An aircraft actually has two black boxes. One is a flight data recorder, which stores information on specific parameters such as flight control and engine performance. The second is a cockpit voice recorder, which records background sound and conversations between crew members and air traffic control.