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A
757
MAINTENANCE MANUAL
RAM AIR TURB L-ENG LIMITER-R GEN FIELD MANUAL RESET PTU
ON
PRESS G ON ON FIELD WOFF W FIELD OFF W FIELD OFF
UNLKD A A INOP A INOP L R APU OFF
FLT CONTROL SHUTOFF
ENG START
L 1 BOTH 2 R ON ON ON
VALVE VALVE A OFF A OFF A OFF
A A
L C R
GND USE ONLY
AUTO AUTO
GND OFF GND OFF
CONT CONT RIGHT SIDE PANEL, P61
HYDRAULIC FLIGHT CONTROL
FLT FLT SHUTOFF SWITCHES
(EXAMPLE)
B
PILOTS OVERHEAD PANEL, P5
ENGINE IGNITION AND
START CONTROL PANEL
(EXAMPLE)
A
SEE A SEE B
NORM
r OUT CUT r
C R
STAB TRIM
CUTOUT SWITCHES HYDRAULIC POWER STABILIZER TRIM QUADRANT STAND, P10 C SEE C FLIGHT COMPARTMENT
Hydraulic System Controls Figure 9
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A757MAINTENANCE MANUAL
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Flight Control - Hydraulic Distribution
Figure 10
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757
MAINTENANCE MANUAL
(1)
The left, center and right hydraulic systems provide hydraulic power to the respective left, center and right flight control systems actuators and servos. Hydraulic power required for all flight control systems except flap/slats and stabilizer trim, is routed through shut-off valves (SOV). The stabilizer trim system has two individual hydraulic power cutout valves, one in the right and one in the center systems.
(2)
All three main hydraulic systems provide power for the following components:
(a)
Ailerons - Autopilot Lateral Control Servos (ALCSs) and Power Control Actuators (PCAs)
(b)
Spoilers - PCAs
(c)
Elevators - PCAs and Autopilot Pitch Control Servos (APCSs)
(d)
Rudder - PCAs and Autopilot Rollout Guidance Servos (ARGSs)
(3)
The Elevator Feel Computers (EFCs) hydraulic power is from the right and center systems. The Yaw Damper Servos (YDSs) hydraulic power is from the left and center systems. The left hydraulic system provides power for the Rudder Ratio Changer (RRC).
L. Flight Control - Flight Deck Inputs (Fig. 11)
(1) Primary Flight Control Inputs
(a) Primary flight control inputs are made using the control column/wheel, rudder pedals, and trim switches.
STABILIZER TRIM SWITCH
AFT ELECTRONICS PANEL (P8) Flight Control - Flight Deck Inputs Figure 11
B56390
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757 MAINTENANCE MANUAL
(b)
AIRPLANES WITHOUT CONTROL WHEEL STEERING; the captain's and first officer's control column/wheels provide the manual control cable input for pitch and roll control. The spoiler system transducers assist in roll control of the airplane.
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