Comment by kashunstva

> RAT … It is what you hear sometimes, when the aircraft is making a very shrill noise flying over your head.

I’ve been around a lot of airplanes and I can’t say I’ve seen or heard a ram air turbine deployed in flight. There was a recent incident involving a Frontier Airlines flight in which the RAT was deployed when the aircraft was put in emergency electrical configuration. The deployment of the RAT would be quite rare.