(a)  
11H17, FLT CONT SHUTOFF TAIL LEFT

 (b)  
11H18, FLT CONT SHUTOFF TAIL CTR

 (c)  
11H28, FLT CONT SHUTOFF TAIL RIGHT

 S 864-009
 (9)  
Move the towing lever on the metering valve module to the tow position. Install the towing lever lockpin in the nose gear (Fig. 403).

 E.
Yaw Damper Summing Lever - Removal (Fig. 401)

 S 034-012
 (1)
Disconnect these components from the yaw damper summing lever:

 (a)  
The ratio changer pogo

 (b)  
The control rod that comes from the ratio changer

 (c)  
The control rods that come from the power control actuators (2 locations).

 S 034-033
 (2)  
Disconnect these components:

 (a)  
The yaw damper bias pogo from the support bracket

 (b)  
The servo summing link from the yaw damper servos (2 locations).

 S 034-036
 (3)  
Do these steps to disconnect the summing lever from the input crank:

 (a)  
Remove the ground springs (2 locations).

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757
MAINTENANCE MANUAL

 (b)  Remove the bolts that connect the summing lever to the input crank (3 locations).
 S 024-013
 (4)  Remove the summing lever.
 TASK 27-21-17-414-014
 3. Yaw Damper Summing Lever - Installation
_______________________________________
 A. Equipment
 (1)  
Rig Pins from Set B20003-XX (Ref 20-10-24/201):

 (a)  
R7 - P/N B20003-13

 (b)  
R8 - P/N B20003-13

 B.
References

 (1)  
06-42-00/201, Empennage Access Doors and Panels

 (2)  
20-10-24/201, Rig Pins

 (3)  
22-21-00/501, Yaw Damper System

 (4)  
24-22-00/201, Electrical Power - Control

 (5)  
27-21-00/501, Rudder and Rudder Trim Control System

 (6)  
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 C.
Access

 (1)  
Location Zone 324 Vertical Stabilizer - Rear Spar to Trailing Edge

 (2)  
Access Panels 324AL Body to Fin Seal 324BL Aft Side of Rear Spar and Rudder Hinge 324CL Rudder Hinge and PCUs

 D.
Yaw Damper Summing Lever - Installation (Fig. 402)

 S 434-039
 (1)  
Install the bolts, bushings, spring retainers, washers, nuts, and ground springs that connect the summing lever to the input crank.

 S 434-040

 (2)  
Connect these components:

 (a)  
The servo summing link to the yaw damper servos (2 locations)

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757 MAINTENANCE MANUAL
 (b)  
The yaw damper bias pogo to the support bracket

 (c)  
The control rods for the power control actuators to the summing lever (2 locations)

 (d)  
The control rod from the ratio changer to the summing lever

 (e)  
The ratio changer pogo to the summing lever.

 S 824-017
 (3)  
Adjust the ratio changer pogo until you can easily install and remove rig pin R7.

 S 824-018

 (4)  
Adjust the yaw damper bias pogo until you can easily install and remove rig pin R8.

 S 094-019

 (5)  
Remove rig pin R3 from the feel, centering, and trim mechanism (Fig. 402).

 E.
Yaw Damper Summing Lever - Test

 NOTE: Before you do the test, make sure the airplane is stable at
____ ambient air temperature +/- 10.0 degrees F (+/- 5.5 degrees C) for at least one hour.
　
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