22-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
 YAW DAMPER PANEL - REMOVAL/INSTALLATION
_______________________________________
 1.  General_______
 A.  The yaw damper panel is on the left side of the overhead panel, P5. The yaw damper panel is held in place by four 1/4 turn panel screws. Two electrical connectors are at the rear of the unit.
 TASK 22-21-01-024-001
 2.  Remove the Yaw Damper Panel___________________________
 A.  Reference
 (1)  AMM 24-22-00/201, Electrical Power - Control
 B.  Access
 (1)  Location Zone
 211 Control Cabin (left)

 C.  Prepare for Removal
 S 864-003
 (1)  Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
 (a)  
11A18, YAW DAMPER LEFT

 (b)  
11A34, INDICATOR LIGHTS 3

 (c)  
11F34, YAW DAMPER RIGHT

 (d)  
11P28, R IND LTS 1

 D.  Remove Yaw Damper Panel
 S 034-004
 (1)  
Hold the control panel in position and loosen the four quick-release screws.

 (2)
Carefully lower the yaw damper panel from the overhead panel.

 (3)  
Remove the electrical connectors attached to the rear of the panel.

 S 034-005
 S 034-006
 TASK 22-21-01-424-007
 3.  Install Yaw Damper Panel________________________
 A.  Reference
 (1)  AMM 24-22-00/201, Electrical Power - Control
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 B. Access
 (1)  Location Zone
 211 Control Cabin (left)

 C. Prepare for Removal
 S 284-008
 (1)  Make sure that the panel is aligned correctly and connect the two electrical connectors to the back of the unit.
 D. Install the Yaw Damper Panel
 S 434-009
 (1)  Raise the panel into position and attach it with the four
 quick-release screws.

 E. Yaw Damper Panel Test
 S 864-010
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-011

 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel.

 (a)  
11A18, YAW DAMPER LEFT

 (b)  
11A34, INDICATOR LIGHTS 3

 (c)  
11F34, YAW DAMPER RIGHT

 (d)  
11P28, R IND LTS 1

 S 984-012
 (3)  Push the IND LTS TEST button on the P5 panel and make sure the light on the panel is on.
 F. Put the Airplane Back to Its Initial Condition
 S 864-013
 (1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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 22-21-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 YAW DAMPER SERVO - REMOVAL/INSTALLATION
_______________________________________
 1.  General (Fig. 401)_______
 A.  Two yaw damper servos are on the rear spar of the vertical stabilizer. You can access the servos through the trailing edge service access panel, 324BL, of the vertical stabilizer (AMM 06-42-00/201).
 TASK 22-21-02-024-057
 2.  Remove Yaw Damper Servo_______________________
 A.  References
 (1)  
AMM 06-42-00/201, Empennage (Major Zone 300) Access Doors and Panels.

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 (3)  
AMM 27-21-00/501, Rudder and Rudder Trim Control System

 (4)  
AMM 27-61-00/201, Spoiler/Speedbrake Control System

 (5)  
　
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