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How long can a black box survive underwater?

The black box stores all kinds of information and conversations about the plane. Thanks to its sturdy design, it can be protected even under the hardest conditions. Passenger planes' black boxes are able to send signals under the sea for 90 days.



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The black box stores all kinds of information and conversations about the plane. Thanks to its sturdy design, it can be protected even under the hardest conditions. Passenger planes' black boxes are able to send signals under the sea for 90 days.

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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.

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The greatest depth from which a flight recorder has been recovered is 16,000 feet (4,900 m), for the CVR of South African Airways Flight 295.

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* The black box works in depths up to 6,000 metres of saltwater. * If a plane crash takes place on land and not on water, the locator beacons of the black box will not send out the ultrasonic pings, signalling the investigators to look for the unit around the crash site.

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While each black box is fitted with a battery with a six-year life span, once the locator beacon is activated, it can only send out pings for 30 days.

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