Lionair plane down in Bali.

[repariit]

Aircraft are design and certified not to crash, what happens if they do, is varriable as heck.

This is true to some extent, but it is worth noting that a significant portion of FAR Part 25 is devoted to requiring engineering attention to make them crash successfully. For example, in this instance:

1. The engines appear to have separated from the wing without destruction of the front spar, rear spar, and the upper and lower skins. The wing tanks were not broken open, and the airframe maintained some buoyancy.
2. The passenger seats were mounted to the tracks with sufficient strength to hold the occupants in place under crash G loads.
3. Likewise the galleys, and other heavy equipment items did not separate from their fittings and tumble over cabin occupants.
4. Slide/rafts appear to have deployed, and life vests were in use.