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A

757
MAINTENANCE MANUAL

YAW DAMPER
MECHANISM
SUPPORT BRACKET
SEE A (2 LOCATIONS)
GROUND SPRING
(2 LOCATIONS)
INPUT CRANK (3 LOCATIONS)
SPRING RETAINER (2 LOCATIONS)
SUMMING
CONTROL RODS
LEVER
TO THE PCAs
INPUT CRANK
GROUND SPRING SUMMING
(2 LOCATIONS) LEVER

A
SERVO
LINKAGE
SEE B RATIO CHANGER POGO
YAW DAMPER SERVOS
FWD FWD
YAW DAMPER MECHANISM
A

1 AIRPLANES WITH SHEAR PINS
2 AIRPLANES WITH SHEAR RIVETS
YAW DAMPER  INPUT  YAW DAMPER 
SERVO  SHEAR PIN 1  CRANK  BIAS POGO 
SUMMING LINK  ARM 
SUPPORT 
BRACKET 

INPUT CRANK (3 LOCATIONS)
BOLT BUSHING BOLT
WASHER WASHER
NUT BUSHING NUTCONTROL RODS TO THE PCAs
A-A
SHEAR SERVORIVETS 2 SUMMING LINK
A
BOLT WASHER NUT (2 LOCATIONS)
YAW DAMPER SERVOS SERVO LINKAGE
B
Yaw Damper Summing Lever Installation
Figure 401

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757 
MAINTENANCE MANUAL 
MIDDLE POWER 
CONTROL ACTUATOR 
SEE  D 
YAW DAMPER 
MECHANISM 
SEE  A 
FEEL, 
CENTERING, 
AND TRIM 
MECHANISM 
SUMMING LEVER 
SEE  B  A 

A RATIO CHANGER POGO SEE E
YAW DAMPER BIAS POGO
SEE C
YAW DAMPER
SERVOS
FWD INBD
YAW DAMPER MECHANISMA
RIG PIN
HOLE R3

FEEL, CENTERING, AND TRIM MECHANISM
B
Rig Pin Installation Figure 402 (Sheet 1)
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757 MAINTENANCE MANUAL
POGO
RIG PIN HOLE R8
BOLT BUSHING WASHER NUT
YAW DAMPER BIAS POGO
C
POGO
RIG PIN HOLE R7
FWDRIG PIN HOLE R4
MIDDLE POWER CONTROL ACTUATOR D
RATIO CHANGER POGO E
Rig Pin Installation Figure 402 (Sheet 2)
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757 MAINTENANCE MANUAL
 (4)  S 864-032Operate the rudder trim knob on the aft electronic control panel, P8, until the rudder trailing edge aligns with neutral on the tail index plate.
 (5)  S 494-043Install rig pin R3 in the feel, centering, and trim mechanism.
 (6)  S 864-031Remove the power from the left, right, and center hydraulic systems (Ref 29-11-00/201). 

TOWING LEVER LOCKPIN
TOWING LEVER (IN THE TOW POSITION)
TOWING LEVER SEE A TOWING LEVER
A
Nose Gear Steering Isolation Figure 403
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757
MAINTENANCE MANUAL

 S 864-007
 (7)  
Move the FLT CONTROL SHUTOFF L, R, and C switches on the right side panel, P61, to OFF. Attach DO-NOT-OPERATE tags and make sure the switch position lights come on.

 S 864-008

 (8)  
　
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