A jet engine is just that, a jet engine. They have blades in the front, which narrow down to the compressor stage. There is where the problem occurs. The blades already fractured by a foreign object other than AIR, chicken or what not , will not go into the compression state. The fractured blades with the other foreign object then enter the compression stage, when that takes place, the engine will self disstruct, implode within itself creating an engine failure. Jet fighter, bomber, Airliner, jets engines operate on the same principal, air in air out. Any object sucked into those fan blades with create havoc in that engine.