![Aviation Toulouse on X: "Did you know that during each first flight the RAT (Ram Air Turbine or emergency power system) is tested ? RAT of #A350 msn 62 of yesterday. https://t.co/TQ7NfiTnWc" / Aviation Toulouse on X: "Did you know that during each first flight the RAT (Ram Air Turbine or emergency power system) is tested ? RAT of #A350 msn 62 of yesterday. https://t.co/TQ7NfiTnWc" /](https://pbs.twimg.com/media/Cxk4zb4XgAABpBT.jpg)
Aviation Toulouse on X: "Did you know that during each first flight the RAT (Ram Air Turbine or emergency power system) is tested ? RAT of #A350 msn 62 of yesterday. https://t.co/TQ7NfiTnWc" /
Why is there an RAT in the aircraft when we already have an APU in the aircraft? Doesn't it just add weight to the aircraft? - Quora
![SJet on X: "A ram air turbine (RAT) is a small wind #turbine that is connected to a hydraulic pump, or electrical generator, installed in an #aircraft and used as a power SJet on X: "A ram air turbine (RAT) is a small wind #turbine that is connected to a hydraulic pump, or electrical generator, installed in an #aircraft and used as a power](https://pbs.twimg.com/media/Dgitwu-WsAIcDF6.jpg)
SJet on X: "A ram air turbine (RAT) is a small wind #turbine that is connected to a hydraulic pump, or electrical generator, installed in an #aircraft and used as a power
![The ram air turbine (RAT) automatically deploys under emergency conditions and uses the airstream flowing past the airplane's fuselag… | Cockpit, Turbine, Aviation The ram air turbine (RAT) automatically deploys under emergency conditions and uses the airstream flowing past the airplane's fuselag… | Cockpit, Turbine, Aviation](https://i.pinimg.com/originals/d2/26/8a/d2268ad0dae0e1eff3876af5e082114f.jpg)
The ram air turbine (RAT) automatically deploys under emergency conditions and uses the airstream flowing past the airplane's fuselag… | Cockpit, Turbine, Aviation
![aircraft systems - Is there a maximum airspeed to deploy a ram air turbine? - Aviation Stack Exchange aircraft systems - Is there a maximum airspeed to deploy a ram air turbine? - Aviation Stack Exchange](https://i.stack.imgur.com/tGcsX.jpg)