757
MAINTENANCE MANUAL

SEEA
CENTER SYSTEM PRESSURE REDUCING VALVE
ELEVATOR PRESSURE 
PRESSURE RIGHT SYSTEM  VALVE REDUCER BYPASS  LEFT SYSTEM REDUCING VALVE PRESSURE 
REDUCING VALVE 

A

Elevator Pressure Reducer Valves and Bypass Valve
Figure 7

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A
757
MAINTENANCE MANUAL

HORIZONTALLEFTCENTER
STABILIZER INPUT
HYDRAULICHYDRAULIC
SYSTEM SYSTEM

PITOTBELLOWS BELLOWS PITOT
SYSTEM
MOTOR

SYSTEM OPERATED
MOTOR
SHUTOFF

TO RIGHTSTATIC
OPERATED
STATIC PRESSUREVALVE
HYD SYS
PRESS APL APLNOSE UP NOSE UP
SHUTOFF
VALVE
A
ELEV PRESSURE
REDUCER BY-PASS VALVE

SHEET 2
INTERNALS
SAME
AS

B
PITCHLOWERCRUISE
TO STABSIGNALS
AUTOPILOT
TRIM
TO STAB
PITCHCHANNEL
CONT
TRIM-CENTER
CONTROL
MOD
CONTROLS1
SERVOS2 MODULE
CTR SYSR SYS
(SH 2)LOW LOW
INTERNALS
SAME

PITCHAS CRUISELOWERNC
SIGNALS MIDDLE AUTOPILOT
AUTOPILOT
CHANNEL PITCH CONTROL
PITCH
-LEFT  SERVO ELEV
CONTROLFEEL (W)
SERVO
(SH 2) ELEVATOR FEEL COMPUTER
SAME AS

INTERNALS
L/R EICAS
LEFT ELEV
RIGHT ELEV CMPTR
PRESS. REDUCER PRESSREDUCER
INTERNALS
(SH 2)
SAME AS R LO
ELEV PRESS
PRESS
ELEV CREDUCER
SW
HYDHI PRESSLO
(SH 2)
PRESS
(W) PRESS
ELEV LSW
SW HYD
L/R EICAS CMPTRS
UPPER AUTOPILOT

PRESS
HICENTER ELEV
ELEVATORPITCH CONTROL
(W)
PRESSPRESS REDUCER
FEEL ACTUATORSERVO
SW L/R EICAS CMPTR
1  REF TO AMM 27-23-00 FORINFORMATION ON PCU MONITOR SYSTEM
INTERNALSINTERNALSRUDDER/ELEVATORINTERNALS
INTERNALSINTERNALS
SAME ASSAME ASINTERNALS RUDDER/ELEVATOR
SAME ASSAME ASINTERNALS RUDDER/SAME AS
INTERNALS
PCU MONITOR SYSTEM SAME ASR OUTBOARD R OUTBOARDSAME ASPCU MONITORELEVATOR
R OUTBOARD R OUTBOARD
SAME AS
R OUTBD ELEV PCA ELEV PCA R OUTBD SYSTEM
1 1
R OUTBD ELEV PCA ELEV PCA R OUTBD PCU MONITOR(SH 2) (SH 2)
(SH 2) (SH 2)
SYSTEM
PRESSURE PRESS DIFFLEFT MIDDLELEFT INBD PRESS DIFF
PRESS DIFFRIGHT INBDRIGHTPRESS DIFF

ELEV FEEL &
SENSOR ELEV PCA ELEV PCA SENSOR

1
CENTERING UNIT
RETURN SENSOR ELEV PCA MIDDLESENSOR
METERED

ELEV PCA
NEUTRAL SHIFTPRESSURE INPUT FROM
FIRST OFFICERSCAPTAIN'S CONTROLCONTROL COLUMNCOLUMN INPUT
STABILIZER INPUT
Elevator Control System Schematic (Hydraulic)
Figure 8 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

CAPTAINS'/
RIGHT FIRST OFFICER'S
HYDRAULIC INPUT
SYSTEM MOTOR
INTERNALSOPERATED
INTERNALS
SAME ASSHUT OFF RUDDER/ELEVATOR SAME AS
ELEVATOR R.VALVE PCU MONITOR SYSTEM R OUTBD OUTBOARD
ELEVATORPCA
1
CONTROLPRESS DIFFSENSOR
LEFT ELEV. OUTBD PCA
A

CONTROL VALVE SHEET 1 B
RUDDER/ELEVATORPCU MONITORACTUATOR
SYSTEM LO 1 RIGHT ELEVATOR OUTBOARD POWER PRESSURECONTROL ACTUATOR (PCA)
DIFFERENTIALSENSORLO PRESSURE
ELEV R
SWITCH
HYD PRESSHI
(W)
HI PRESSURE SWITCH  L/R EICAS COMPUTERRIGHT ELEVATOR PRESSURE REDUCER
PITCH RATE/
COLUMN FORCE/

ENGAGE
SERVO POSN ARM

SOLENOIDSOLENOID
EH SERVO
VALVE
28V DC

PRESREG 28V DC
SERVO VALVE PITCHCRUISESIGNALSCHANNEL
26V AC-CENTER
ELEV
SERVO
POSN

ACT RES LVDT
ACTUATOR

26V AC
ELEV
SURFACE

ELEVATOR CONTROL
POSN CRANK POSN SYSTEM INPUTLVDT LOWER AUTOPILOT PITCH CONTROL SERVO
Elevator Control System Schematic (Hydraulic)
　
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