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user14897

Why does this airplane757 have such a strange designpropeller engine attached to the fuselage?

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Why does this airplane have such a strange design?

I saw the following photo of a Honeywell Aviation Services Boeing 757-225:

Honeywell Aviation Services Boeing 757-225

If it's not a fake, the airplane has a propeller mounted on a pylon on one side.

What's the purpose of such strange design? Why does it need a propeller engine, if it already has two jet engines? Or is it a permanently deployed RAT?