Airplane's black boxes are deliberately designed to survive worst-case scenarios. This is due to their design and materials — all rigorously tested.

A preliminary finding into last month’s Air India plane crash has suggested the aircraft’s fuel control switches were turned off, starving the engines of fuel and causing a loss of engine thrust shortly after takeoff.

The Air India flight crash report said that both engines lost thrust shortly after takeoff because the aircraft’s fuel control switches had been turned off.