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12-0 Hydraulic Controls

1.
The three indicators show the hydraulic liquid level in the three hydraulic system reservoirs.
The left one is for the blue system, the right one for the yellow system and the center one for the green system.
2.
The hydraulic pumps in engine 1 serve the blue and green systems.
3.
The hydraulic pumps in engine 2 serve the green and yellow systems.
4.
The electric pump pressurizes the green hydraulic system..
5.
The Power Transfer Units (PTU) connects the green system to the blue or the yellow system. Note that there is no liquid exchange between the systems.
6.
The Servo Control Valves control the liquid flow to the hydraulic servos for the control surfaces etc.