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Does anyone know what this is on my CRJ?


HeartofDavid
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It's a small Ram Air Turbine (known as a RAT) used in the event of a dual engine failure.  It provides electricity to the emergency bus and has a small hydraulic pump for gear and flight controls.  Usually deploys automatically given certain criteria, but can be deployed manually for ops checks.  I have deployed one in real life for an ops check and it makes a heck of a loud racket.  Can't be stowed in flight once deployed.

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