General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

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Once deployed, can the RAT be stowed in flight?

Yes, anytime during flight
No, only on the ground
No, unless both engines are running
Yes, but only below 10,000 feet

The correct answer is: No, only on the ground

The correct understanding regarding the deployment and stowing of the Ram Air Turbine (RAT) is that once the RAT is deployed during flight, it cannot be stowed again until the aircraft is on the ground. The RAT is a critical emergency device used to provide hydraulic power and electrical power when both engines fail, and its deployment signifies that the aircraft is in an emergency condition. Stowing the RAT while in flight would pose significant risks since it could interrupt the emergency power supply that has been activated to help ensure control of the aircraft. Therefore, it is designed to remain deployed during flight under emergency conditions until landings can be safely executed. The other choices imply scenarios that distract from the fundamental principle that the RAT is only stowed when the aircraft is on the ground.