YAW DAMPER MECHANISM
FWD AUTOPILOT ROLLOUT
B
GUIDANCE SERVOS (3)
CONTROL LINKAGES
YAW DAMPER POGO A
C
Yaw Damper Mechanism Figure 507 (Sheet 1)
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A

757 MAINTENANCE MANUAL
INPUT CRANK
CONTROL ROD TO YAM DAMPER
THE RATIO CHANGER BIAS POGO
(PRIMARY INPUT)
THERMAL COMPENSATING INPUT CRANK
CONTROL RODS TO THE PCAs
YAW DAMPER SERVO LINK RATIO CHANGER POGOSEE D (SECONDARY INPUT)
YAW DAMPER
SUMMING LEVER INPUT FWD CRANK
A-A
RIG PIN HOLE  SHEAR PIN YAW DAMPER  SERVO LINK YAW DAMPER  RIVETS SHEAR  SERVO LINK YAW DAMPER 
(FOR RIG PIN R9)  MANUFACTURED 
HEAD 

FWD
YAW DAMPER SERVO LINK YAW DAMPER SERVO LINK D1 D2
1
AIRPLANES WITH SHEAR PINS
2
AIRPLANES WITH SHEAR RIVETS
Yaw Damper Mechanism Figure 507 (Sheet 2)
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A

757 MAINTENANCE MANUAL
TRANSFER BELLCRANK (3 LOCATIONS)
PCA INPUT LEVER  TOP 
(3 LOCATIONS)  PCA 
CONTROL 
LINKAGES  324CL 
SEE A  INPUT ROD 
324BL  PCA  (3 LOCATIONS) 
YAW DAMPER 
324AL  RUDDER  RIG PIN R9 
RATIO CHANGER  (SHEAR PIN 
FEEL, CENTERING  INSPECTION 
AND TRIM MECHANISM,  HOLE) 
ROLLOUT 
GUIDANCE 
SERVOS 

R
MIDDLE PCA
RUDDERL HINGE
PCA (3)
SEE B
C SUMMING LEVER YAW DAMPER
SECONDARY CONTROL RODSSEE C
POSITION YAW DAMPER
TRANSMITTER
POGO PRIMARY PRIMARYCONTROL RODYAW DAMPER CONTROL RODS
SERVO (2) RATIO CHANGER POGOC ROD (SECONDARYL BOTTOMCONTROL ROD)
PCA SEE D FWD
RUDDER RATIO
CHANGER
SEE E
FEEL, CENTERING, AND TRIM MECHANISM FWDAUTOPILOT ROLLOUT TO YAW DAMPER
GUIDANCE SERVOS (3) R SUMMING LEVER
C
CONTROL LINKAGES PCA L
A B
Power Control Actuator (PCA) Adjustment
Figure 508 (Sheet 1)

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757
MAINTENANCE MANUAL

TO PCA'S TO PCAs
OUTPUTS YAW DAMPER
RATIO CHANGER
SUMMING LEVER POGO ROD
CONTROL RODS (SECONDARY
YAW DAMPER
SUMMING LEVER CONTROL ROD) SEE D
SHEAR PIN
RATIO CHANGER YAW
PRIMARY
POGO ROD DAMPER
CONTROL
(SECONDARY SERVOS
ROD CONTROL ROD)
(2) INPUTS FROM
RATIO CHANGER
YAW DAMPER
POGO RIG PIN HOLE R7
RUDDER RATIO
YAW DAMPER SUMMING LEVER  CHANGER
FWD
C TO YAW RATIO CHANGER DAMPER
POGO ROD
PRIMARY CONTROL
D
ROD
RATIO CHANGER POGO ROD (SECONDARY CONTROL ROD)
SEE D
FWD
TO FEEL, CENTERING, AND
TRIM MECHANISM

RUDDER RATIO CHANGER
E
Power Control Actuator (PCA) Adjustment
Figure 508 (Sheet 2)

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