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It depends on the airplane.

If the plane is a Boeing 727, DC-10 or Lockheed L-1011, it only has three engines.


If it's a 747, which comes from the factory with four, having one engine stop running isn't that bad. Pilots train for the shutdown of one engine. If the fourth engine falls off the wing, which has happened, the plane can go out of control and crash.

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Q: What if a airplane has only 3 engines?
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