(4)  
The Yaw Damper rudder position indicator is installed on the center (P2) instrument panel.

 F.  The Yaw Damper power is supplied through two circuit breakers located on main load control center P18-1. One circuit breaker is for 115 volts ac and the other is for 28 volts dc. The B hydraulic system powers the Yaw Damper actuator portion of the rudder power control unit (Ref Chapter 27).
 2.  Yaw Damper Coupler__________________
 A.  The Yaw Damper coupler provides rudder deflection commands to compensate for movement about the yaw axis.
 B.  The Yaw Damper coupler is installed on the E1-3 shelf of the electronic equipment racks in the electrical and electronic compartment.
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 ú 04 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 1Nov 12/00 

A

737-300/400/500MAINTENANCE MANUAL 
CENTER PANEL (P2) . YAW DAMPER INDICATOR OVERHEAD PANEL (P5) . YAW DAMPER ENGAGE SWITCH
SEE  A  AND WARNING ANNUNCIATOR
SEE  B 
ELECTRONIC RACK E1-3 
. AFC ACCESSORY UNIT
 (OR INTEGRATED FLIGHT
 SYSTEM ACCESSORY UNIT)
 . YAW DAMPER COUPLER 
RUDDER 
SEE  C

RUDDER POWER CONTROL UNIT . ENGAGE SOLENOID . TRANSFER VALVE . POSITION TRANSDUCER
SEE D
YAW DAMPER TEST NUMBER INDICATOR
TEST
PASS LIGHT  PASS  FAIL 
(GREEN)  FAIL LIGHT (REF) 
GO  LAMP TEST 
A  GO SWITCH PUSH BUTTON  LAMP TEST 
BITE  PUSH BUTTON 
OFF  ARM 

BITE OFF/ARM SWITCH
YAW DAMPER COUPLER
TEST POINTS
YAW DAMPER
YAW DAMPER
A
OFF
ON
YAM DAMPER COUPLER
BC
Yaw Damper System Component Location Figure 1 (Sheet 1)
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 22-12-00
 COUPLER  ú
 ú 04 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 2Mar 15/99 

A 737-300/400/500MAINTENANCE MANUAL
SEED
ENGAGE SOLENOID
TRANSFER VALVE RUDDER ATTACHMENT FWD
POSITION TRANSDUCER
RUDDER POWER CONTROL UNIT D Yaw Damper System Component Location Figure 1 (Sheet 2)
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 ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.  Page 3Mar 15/99 

 3.
4.

5.

6.

7.

8.

A
737-300/400/500MAINTENANCE MANUAL
 C.  The Yaw Damper coupler is a rack assembly containing solid state subassemblies for yaw computation, BITE, and power supply and a rate sensor with yaw BITE panel subassembly.
 D.  The front panel of the coupler contains two lights (FAIL, PASS), a GO pushbutton, a LAMP TEST pushbutton, a 2-position BITE toggle switch, and a seven-segment BITE test number display. BITE is armed with the toggle switch. The GO pushbutton is used to start each of the eight BITE tests.
Yaw Damper Engage Switch
________________________
 A.  The Yaw Damper engage switch is used to place the Yaw Damper system in the operating mode.
 B.  The Yaw Damper engage switch is a 2-position solenoid-held switch. The solenoid is controlled by the Yaw Damper engage logic and holds the switch in the ON position.
Warning Annunciator
___________________
 A.  The Yaw Damper warning annunciator indicates that the system is not engaged in the operating mode.
 B.  The warning annunciator is an amber annunciator that illuminates whenever the Yaw Damper is not engaged. The master caution lights and the flight control master caution annunciator lights, located on the glareshield, also illuminate when the warning annunciator is on.
　
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