why does an aeroplane shatter into pieces when it is hit by a bird?

Answer 1

I work for a major commercial airlines manufacturer, and it would take a very large bird to shatter an airplane...which I doubt any bird of that size and mass exist. Now a bird shattering upon impact with an airplane is completely plausible. Flying in an airplane is very safe, in fact part of testing procedures for most airline manufacturers include shooting frozen chickens into the turbines of an engine to see the impact.

Answer 2

it does not shatter into pieces when it is hit by a bird.
infact its the engines (turbines) which get destroyed.
as the bird is flying near the airplane , the suction created by the massive engines to generate tremendous amounts of thrust, sucks the poor bird into it.
as the turbine blades rotate at very high speed, the bird gets sliced into more than a million pieces and this pieces enter at a very high velocity in the turbine compresser where fuel is injected and gets ignited. so when a bird enters the turbines it will damage the fuel lines and thus can cause an explosion in the engine.

Answer 3

It doesn't. In fact they test plane engines, parts and even windshields by shooting dead chickens into them.