Why is a whole plane not made out of a black box durability?
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Deceleration is an issue.
What is deceleration? It’s a change in speed. Imagine that you’re in a car, the brakes are applied. If they’re barely touched, you will not notice it. If the brakes get applied harder, you feel pushed into your seatbelt (you are wearing a seatbelt, right?).
Hit the brakes **hard** and you’ll be pushed painfully into the seatbelt – you’re experiencing a strong deceleration.
Why does this matter for a black box? As it hits the ground during a crash, it decelerates hard – in a fraction of a second it goes from several hundred kilometers per hour, to zero. It’s like being in a car when the brakes are hit hard – but a hundred times worse.
It does not matter for a black box as the contents are mostly electronics, so they can stand up to that violent abuse. However – human beings (and animals in general) cannot decelerate like that – our organs would turn to mush. So the black box would be intact, but the humans inside would be dead.
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