THE "EXTRA" ENGINE OF A PLANE CALLED AN APU Did you know that there is a third engine on twin-engine aircraft or a fifth engine on a quadjet? Yes, that engine is not a jet engine like the ones you see under the wings, but it is usually hidden in the rear of an aircraft. It is also not as big as those jet engines. It is actually small and not a jet engine per se. This is what you call an APU or Auxiliary Power Unit. This is the loud sound you hear while boarding an aircraft. Also, if you look at
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