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The system in drawing below represents a pressure regulated power system comprised of
two parts:
1) the power system, and
2) the actuating system part of the overall hydraulic system.
This type of system was used in all aircraft between 1937 and 1945. The system had a
pressure regulator which "knew" when to withdraw horsepower from the engine when
it was needed. The concurrent blue-red system drawn in that manner because when the
bypass part of the system was used, the blue-red part of the system acted as the return
line to the reservoir and, thus, was "blue". However, the power system was
used to produce hydraulic power, the blue-red part of the system was filled with high
pressure oil and, therefore, was "red".
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Updated: February 23, 1999