How PTU and RAT work
PTU
The PTU is an auxiliary pressure supply for either the green or yellow systems without transfer of fluid between the two systems. It operates automatically if there is a delta pressure of 500psi between
the green / yellow or yellow / green hydraulic systems. The side operating as a pump will take fluid from its associated reservoir and provide an output through the PTU manifold to the HP manifold. The motor side is supplied from the HP manifold through the PTU manifold, and is connected to the return system.
The PTU is de-activated by closing the solenoid valves on the PTU manifolds.
Each section of the PTU has a case drain connection to the return system.
RAT
The RAT is an auxiliary pressure supply for the blue system, and for the emergency electrical power Constant Speed Motor/Generator (CSM / G). It can be deployed automatically or manually depending
on the failure conditions. The RAT is locked when extended.
An interlock mechanism will only permit RAT stowage if the blades are properly aligned.
It also prevents rotation when stowed. The interlock will release at approximately 5 degrees from the full extension position.
Extension is by spring force. Retraction (stowage) is by blue hydraulic pressure.
Up lock release is by solenoid operation.
Down lock release is by hydraulic pressure.
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