Not sure if anyone has mentioned this before...
I was flying online with Bliss taking it in turns to fly the aircraft and be gunners when we jumped in to a BR20 and found the impeller aka ram air turbine we think!!!
Now if it is a ram air turbine if the aircraft was to lose power this device is deployed to generate power.
If you look behind the pilot and above the wing you can see the ram air turbine folded away.
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Here you can see it delploying.
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Door open as well
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Up and running
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I am trying to find out if it is fully functional but the only way is for someone to make a mission in which the power fails and then we can test the device

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