S 024-082
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ YAW DAMPER MODULE. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE YAW DAMPER MODULE.
 (4)  
Remove the applicable yaw damper module from the E1-2/E2-2 shelf (AMM 20-11-22/401).

 S 864-083

 (5)  
Install the dust caps on the electrical connectors.

 TASK 22-21-02-404-047
 3.  Yaw Damper Module Installation_______________________________
 A. References
 (1)  
06-09-01/201, Body Section 41 Access Doors and Panels

 (2)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

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

 (4)  
24-22-00/201, Manual Control

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A
747-400
MAINTENANCE MANUAL

 (5)  
29-11-00/201, Main Hydraulic Supply System

 (6)  
34-21-00/201, Inertial Reference System

 (7)  
IPC 22-21-02, Fig. 4

 B. Access
 (1)  
Location Zone
 117 Electrical and Electronics Compartment, LH
 118 Electrical and Electronics Compartment, RH
 221 Control Cabin, LH
 222 Control Cabin, RH

 (2)  
Access Panel
 117AL Electronics Compartment Access Door

 C. Procedure
 S 864-084
 (1)  Remove dust caps on the electrical connectors.
 S 424-085
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ YAW DAMPER MODULE. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE FROM YOUR BODY CAN CAUSE DAMAGE TO THE YAW DAMPER MODULE.
 (2)  Install the applicable yaw damper module on the correct shelf (AMM 20-11-22/401).
 D. Yaw Damper Module Test
 S 864-049
 (1) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7C09 UPR YAW DAMPER
 2) 7C10 FLT CONT ELEC 2L AC
 3) 7C11 FLT CONT ELEC 2L DC

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A
747-400 MAINTENANCE MANUAL
 4) 7C12 FLT CONT ELEC 1L AC 5) 7C13 FLT CONT ELEC 1L DC 6) 7C14 FLT CONT ELEC 1R AC 7) 7C15 FLT CONT ELEC 1R DC 8) 7C16 FLT CONT ELEC 2R AC 9) 7C17 FLT CONT ELEC 2R DC 10) 7C18 LWR YAW DAMPER
 (2)  S 864-050Supply electrical power (Ref 24-22-00/201).
 (3)  S 864-058Align the left, center and right IRUs in the NAV mode (Ref 34-21-00/201).
 S 864-059

 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SLATS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
Supply hydraulic pressure to the hydraulic systems No. 2 and No. 3 (Ref 29-11-00/201).

 S 864-080

 (5)  
Set the FLT CONTROL HYD POWER TAIL 1, 2, 3, and 4 switches to the NORM position. These switches are on the Pilots' Overhead Maintenance Panel (P461).

 S 864-065

 (6)  
Push and release the engage switch of the applicable yaw damper (P5) to engage the yaw damper system. Make sure that the ON annunciator comes on and the INOP annunciator is off.

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