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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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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