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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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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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