TM 55-1520-240-23-6
7-1
FLIGHT CONTROL HYDRAULIC SYSTEM
(Continued)
7-1
Hydraulic Pump
A variable delivery pump supplies 3,000 psi hydraulic
pressure at a flow rate of 15 gpm to each flight control
system. The No. 1 system pump is driven by the forward
transmission, and is accessible from the passageway.
The pump for the No. 2 system is driven by the aft
transmission. It is accessible from the ramp.
NO BREAK - WORK HARDER
There are four ports in each pump: inlet, outlet, seal
drain (SD), and case drain (CD). Both pumps are
identical and interchangeable, with each other and with
the utility system hydraulic pump on the aft transmission.
Power Control Module
Each power control module (PCM) controls the flow of
all pressure and return fluid through its flight control
hydraulic system. The No. 1 module is located in the
forward transmission fairing, aft of the transmission.
The module for the No. 2 system is in the aft pylon, at
the right side.
NO BREAK - WORK HARDER
Each module has ten major components: pressure
and return filters and indicators; four different valves,
a pressure switch and transmitter, a pump change
indicator, and an accumulator. All of the components
are installed in a manifold. The accumulator dampens
low frequency pressure surges and provides stored
hydraulic power for peak loads.
NO BREAK - WORK HARDER
Functions of the PCM’s are to direct pressure and flow
to either #1 or #2 flight boost system.
Operates on 3000 psi at 7-8 GPM
Electrical power from #2 DC bus 28 vdc
Controlled by boost select switch on
overhead panel in cockpit
Weight 17.2 pounds dry
7-4
