FROM RESERVOIR 115V ACL BUS 28V DCL BUS INLETHYD ACMP
115V AC
ELEC HYD PUMP C1
BUS L ENABLE C1
P6 P11 ACMP C2 CONTROLCIRCUIT (SH 1)
HYD ACMPENABLE RLY C1 OFF LOADSHEDDING CONTROL ACMP C1 CONT
MODULE RLY
2 SEC
INSTR ON WWACMP C1 T/D MDL
LTS T DRAINACMP PUMP C1 SEL SW
ACMP C1 ELCU HYD CONTROL PANEL
R AUTO LANDTO HYD TEMPRLY
L AUTO LANDOUTLETRLY
IND SYS
ACMP C1  ELEC HYD PUMP
C1 MOTOR

CD1 P1 TO HYD PRESS.
IND SYS
ACMP C1 PRESS. SW1
2
3 P
ACMP PRESS. CASE
DRAIN FLTR MDL

TO HYD PRESS.
IND SYS

HYD C SYS PRESS. XMTR
TO RAM AIR
TURBINE SYS
4

LCRLCR LCRLCRLCR LCR LCR LC AUTOPILOT PITCH
AUTOPILOT LATERAL SPOILERS AILERONS RUDDER ELEVATORS STAB TRIMYAW DAMPERAND ROLL 5
Center Hydraulic System Schematic
Figure 17 (Sheet 2)

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 29-11-00
 ALL  ú ú 08 Page 26 ú Jan 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 (2)  
If system pressure becomes too high, a pressure relief valve in the return filter module opens to route fluid through the filter to the system return line.

 (3)  
Fluid flows through the case of each ACMP for cooling and lubrication. This case drain fluid is filtered by the ACMP filter module and is cooled by the system heat exchanger. The cooled fluid is returned to the system reservoir through the return filter module.

 (4)  
The ELEC pump select switches on the hydraulic control panel control the two ACMP's. In the ON position the switch energizes the ACMP control relay to supply 28 volts dc to the ACMP electrical load control unit (ELCU). The ELCU relay closes to supply 115/200 volt, 400 Hz, 3-phase power to the pump motor. The pump then supplies fluid flow as demanded by the operating systems. Moving the pump select switch to the OFF position removes power and stops the pump.

 (5)  
If power is lost on the right main AC bus, the C2 ACMP enable relay opens to de-energize and reset the C2 ACMP time delay. During category 3 autoland, if power is lost on the left main AC bus, the C1 ACMP enable relay and the autoland relays open to de-energize and reset the C1 ACMP time delay.

 (6)  
If power is lost in both engines, the ram air turbine (RAT) deploys to supply center system pressure for operation of the flight controls. For information on the RAT, refer to 29-21-00.

 (7)  
ACMP electrical load shedding
　
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