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Illustration taken from this youtube video

Earlier in the video, it can be seen moving:

Is it to provide mechanical power for the boom operation ?

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It’s a ram air turbine which drives a fuel pump to provide pressure to transfer gas through the hose and drogue to the receiving aircraft.

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    $\begingroup$ Any source ? Why not use electric power ? $\endgroup$ – Antzi Jun 20 '19 at 6:22
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    $\begingroup$ @Antzi from the linked duplicated question, "Pods operate with aircraft power or are self-powered by a Ram Air Turbine.". Also, the same solution is used on some EW pods $\endgroup$ – DeepSpace Jun 20 '19 at 6:47
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    $\begingroup$ I believe it actually powers the hydraulic pump for the reel that runs the hose in and out. $\endgroup$ – Michael Hall Jun 20 '19 at 15:22

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