Why would this Boeing 747 need a 5th engine?

This is not a photo shop, but a photograph of a Qantas Boeing 747-300 with a little extra cargo — a 5th engine.

When a Qantas airplane needs a replacement engine or to have one worked on, sometimes they will attached the 5th engine onto a Boeing 747 and fly it without power to its destination.

This ends up being more cost effective for the airline. The 5th engine will limit the 747’s performance (not that it is known for its sporty maneuvering already), but it provides no additional safety risk.

There is also a photo of a Qantas Boeing 747-400 with a 5th engine.

People on Twitter are sharing other airplanes with additional engines:
* Lockheed L1011 Tristar thanks FlyingPhotog
* Boeing 720 thanks apgphoto
* DC-8 thanks TxAGFlyer
* Pan Am Boeing 747 thanks Skippyscage

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