Although the black box is not a new device, it still operates with the same principle today. The last 2 hours of conversations in the cockpit, together with the data from the last 25 hours of the aircraft, are recorded by this device.
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A black box is a flight data recorder that must be in every air vehicle. All flight information is recorded into the black box with a specific algorithm. This makes the recorded flight data accessible to authorities when needed. Contrary to popular belief, the black box is mostly bright orange, not black.
Flight recorders are normally located near the aircraft's tail, as experience has shown that this area generally suffers the least damage during an accident. Flight recorders are designed to survive both high-speed impact and post-impact fire. They are, however, not invulnerable and are sometimes destroyed.
If an accident occurs, a transcript of the flight is made going back to the start of the flight or however far back the tape allows. The actual voice recordings are supposedly never released to the public. in most cases the voice recorder is continually overwritten.
Answer: If a flight data recorder is recovered from the water, it is submerged in fresh, clean water to prevent deposits such as salt or minerals from drying out within the device.
Such recorders are fitted with locator beacons. These broadcast their location for up to 30 days, even when submerged as deep as 6,000 meters (20,000 ft) underwater, which increases their chance of being found.