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the pilot valve allows fluid to travel from one side of the servo to the other when flight control inputs are made.  Although the flight control inputs are not boosted because there is no hydraulic pressure, the trapped fluid doe not provide rotor system feedback reduction.

Differential Relief Valve:  If heavy main rotor loads cause the back pressure to exceed system pressure the differential relief valve will open and allow pressure fluid to be directed to the return line and back to the reservoir.

6.2.5.1.

State how a fluid return point is established.

600 ±50 psi hydraulic fluid enters the servo pressure port and is directed to the sequence valve.  This pressure pushes down on the popet valve and spring (part of the sequence valve) which opens the return port for fluid to return to the reservoir.   If pressure is lost, the spring pops up and closes the return port.

6.2.5.2.

Described how the system dampens main rotor feedback.

When system pressure is lost the sequence valve traps fluid in the servo and the pilot valve allows fluid to travel from one side of the servo to the other when flight control inputs are made.  Although the flight control inputs are not boosted because there is no hydraulic pressure, the trapped fluid doe not provide rotor system feedback reduction.

6.2.5.3.

State the result of excessive system back pressure.

If heavy main rotor loads cause the back pressure to exceed system pressure the differential relief valve will open and allow pressure fluid to be directed to the return line and back to the reservoir.

6.2.5.4.

State how flight control receive hydraulic boost.

The pilot valve directs 600 ±50 psi hydraulic fluid to one side of the servo.  When the servo moves to the proper position the pilot valve centers and fluid flow is stopped.

6.2.5.5.

State how the actuator works when hydraulic pressure is lost.

When system pressure is lost the sequence valve traps fluid in the servo and the pilot valve allows fluid to travel from one side of the servo to the other when flight control inputs are made.  Although the flight control inputs are not boosted because there is no hydraulic pressure, the trapped fluid doe not provide rotor system feedback reduction.

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