Yaw Damper System - Component Index
Figure 101 (Sheet 2)

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A04547
A
747-400 FAULT ISOLATION/MAINT MANUAL
P7 PANEL PASSENGER OXYGEN AND YAW DAMPER CONTROL PANEL, M7315
SEE A
YAW DAMPER UPPER LOWER
ON ON
ww
INOP INOP
aa
FLT COMPT
YAW DAMPER ENGAGE SWITCHES
PASSENGER OXYGEN AND YAW DAMPER CONTROL PANEL, M7315
A
E2-2
LOWER YAW DAMPER MODULE, M7363
SEE B
FWD
UPPER YAW DAMPER MODULE, M7362
SEE  B  E1-2  P/A 
SERIAL NO. 
BOEING 
MAIN EQUIP CTR 

UPPER, LOWER, YAW DAMPER MODULE,
M7362,M7363

B

Yaw Damper System - Component Location
Figure 102 (Sheet 1)

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A
747-400 FAULT ISOLATION/MAINT MANUAL
STA

FORWARD, AFT, MODAL SUPPRESSION
ACCELEROMETER, M7953,M7954,M7955,M7956

Yaw Damper System - Component Location
Figure 102 (Sheet 2)

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A
747-400 MAINTENANCE MANUAL
 YAW DAMPER SYSTEM - ADJUSTMENT/TEST
___________________________________
 1.  General_______
 A.  This procedure contains four tasks. The first task is the operational test of the yaw damper system. The second task is the yaw damper actuator ground test. The third task is the yaw damper ground test. The fourth task is the system test of the yaw damper system.
 B.  You can use one of the Control Display Units (CDU) to start the CMCS tests. The printer (optional) permits you to make a copy of the results of the CMCS tests. This printer is on the aft electronics control panel (P8).
 C.  When you do the operational test, ground tests or the system test, make sure that these systems are serviceable:
 (1)  
Rudder and Rudder Trim Control System (Ref 27-21-00/501).

 (2)  
Integrated Display System (Ref 31-61-00/501).

 (3)  
Air Data Computing System (Ref 34-12-00/501).

 (4)  
Inertial References System (Ref 34-21-00/501).

 (5)  
Flight Management Computer System (Ref 34-61-00/501).

 (6)  
Central Maintenance Computer System (Ref 45-10-00/501).

 TASK 22-21-00-715-001
 2.  Operational Test - Yaw Damper System____________________________________
 A.  General
 (1)  The operational test of the yaw damper system is for a fast check of the yaw damper system. It makes sure that the yaw damper system is serviceable.
 B.  Procedure
 S 745-172
 (1)  Do this task for the upper and lower yaw dampers: Ground Test - Yaw Damper Actuator.
 TASK 22-21-00-745-173
 3.  Ground Test - Yaw Damper Actuator_________________________________
 A.  General
 (1)  This test is for a check of the yaw damper actuator. During this test, the rudder (upper or lower) moves in the left and right directions and the yaw damper INOP light comes on. The yaw damper INOP light goes off when the test is completed.
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