From the 787 Boeing training material
1. The RAT is stowed in a compartment aft of the right main landing gear.
2. When commanded, a spring-loaded actuator deploys the RAT into the
airstream.
3. The RAT uses propeller blades that turn in the airstream to turn a shaft.
4. The shaft turns an elecric generator and a hydraulic pump.
- This supplies hydraulic and electric power to critical systems such as flight
contols and primary display system.
5. The RAT system supplies hydraulic pressure to the center hydraulic system.
6. The RAT can extend automatically or manually.
7. The RAT can operate at all flight speeds and altitudes.
8. The RAT door is mechanically linked to the RAT.
- When the RAT deploys, the link opens the door.