(b)
When an error signal is applied, the motor armature rotates in proportion to the magnitude and direction of the input signal and moves the projector jet accordingly. The jet directs more hydraulic pressure to one end of the piston than the other, causing it to move and open the corresponding output port, to complete hydraulic pressure through the servo. When the error signal is nulled, the motor armature and jet return to center. This equalizes the pressure on the piston and, with the aid of the centering springs, causes the piston to recenter and close both output ports.
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A
747-400
MAINTENANCE MANUAL
ENGAGE SOLENOID VALVE
MOUNT POINTS (2) ELECTRO-HYDRAULIC SERVOVALVE (EHSV)
OUTPUT
CRANK ARM SOLENOID
VALVE
FILTER POINT
MOUNT AUTOPILOT LVDT
OUTPUT LVDT
ELECTROHYDRAULIC
SERVOVALVE PRESSURE REGULATORRETURN PORT
ENGAGE SOLENOID VALVE
AUTOPILOT
ARM SOLENOID LVDT
VALVE
PRESSURE AUTOPILOTDETENT
PORT ACTUATORENGAGE PISTONPISTONSFILTER OUTPUT ARM
OUTPUTCRANK OUTPUT LVDT
Lateral Autopilot Servo - Component Details Figure 4
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747-400
MAINTENANCE MANUAL
OUTPUT TO SPOILERS
VALVE ENGAGE SOLENOID CONNECTOR ELECTRICAL
SERVOVALVE ELECTROHYDRAULIC
MOUNTING POINTS (4) VALVE ARM SOLENOID
OUTPUT TO AUTOPILOT
AILERONS LVDT
ELECTROHYDRAULIC
RETURN SERVOVALVE PRESSURE
PORT DETENT ENGAGE REGULATOR
ENGAGE SOLENOID PISTONS
VALVE AUTOPILOT
ACTUATOR
PISTON
ARM SOLENOID
VALVE AUTOPILOT
LVDT
FILTERS CONTROL VALVE
RETURN
INPUT LEVERPRESSURE FILTERPORT PRESSURE PORT
(TO SPOILER) (TO AILERON)
MAIN ACTUATOR ASSEMBLY
OUTPUT SUMMING LEVER MAIN ACTUATOR LVDT
Central Lateral Control Package - Component Details Figure 5
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747-400 MAINTENANCE MANUAL
OUTPUT CRANK
OUTPUT LVDT
ENGAGE SOLENOID VALVE
ELECTRICAL CONNECTOR
AUTOPILOT HYDRAULIC
LVDT RETURN
FILTER
ELECTROHYDRAULIC ARM SOLENOID
SERVOVALVEHYDRAULIC VALVE
PRESSURE
ELECTROHYDRAULIC
PRESSURE SERVOVALVE ELECTRICAL ENGAGE SOLENOID
FILTER PORT CONNECTOR VALVE
PC CR PRC
ARM SOLENOID
VALVE
P
C P
PRESSURE
RR
REGULATOR LVDT RD
AUTOPILOT
D
RELIEF VALVE
AUTOPILOT
DETENT POSITION ACTUATOR
(SHOW ENGAGED) PISTON
OUTPUT ARM
OUTPUT CRANK OUTPUT LVDT
Rollout Power Control Package - Component Details Figure 6
D20496
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747-400 MAINTENANCE MANUAL
(c)
The EHSV is installed with four bolts and sealed with a gasket plate. Electrical pins are mated when the EHSV is bolted into position.
(d) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 空调 AUTO FLIGHT(108)
