NOTE: Port 052 = LWR YDM
____
 (g)  
Push the LSK 1L to move the data into the correct position.

 (h)  
Make sure that bits 17 and 18 are "0" for the ARINC word "C/025/350/00" and the ARINC word "C/052/350/00".

 NOTE: (LBL 350, SDI00, BIT 17) = FWD ACCEL FAULT
____ (LBL 350, SDI00, BIT 18) = AFT ACCEL FAULT
 P. Put the Airplane Back to Its Usual Condition
 S 865-129
 (1)  
Push and release the engage switches of the upper and the lower yaw dampers (P5) to disengage the yaw damper system.

 S 865-130

 (2)  
Set all the mode selector switches on the IRS control panel (P5) to the OFF position if it is not necessary (AMM 34-21-00/201).

 S 865-132

 (3)  
Remove the hydraulic power if it is not necessary
 (AMM 29-11-00/201).

 S 865-222

 (4)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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747-400 MAINTENANCE MANUAL
 TASK 22-21-00-715-166
 6.  Yaw Damper Engage Test______________________
 NOTE: This is a scheduled maintenance task.
____
 A. General
 (1)  This procedure is for the INOP annunciation and EICAS message check of the yaw damper module.
 B. References
 (1)  
AMM 11-17-01/201, P7 Overhead Circuit Breaker Panel

 (2)  
AMM 11-20-03/201, Overhead Panel

 (3)  
AMM 22-11-01/401, FCC Software Installation

 (4)  
AMM 24-22-00/201, Manual Control

 (5)  
AMM 34-21-00/201, Inertial References System

 (6)  
AMM 34-61-00/501, Flight Management Computer System

 C. Preconditions
 S 865-259
 (1)  These conditions are necessary for this task:
 (a)  
Electrical Power On (AMM 24-22-00/201).

 (b)  
IRUs must be in the NAV mode (AMM 34-21-00/201).

 (c)  
P7 Overhead Circuit Breaker Panel, installed (AMM 11-17-01/201).

 (d)  
Overhead Panel (P5), serviceable (AMM 11-20-03/201).

 (e)  
Flight Control Computer (FCC), serviceable (AMM 22-11-01/401).

 (f)  
Flight Management Computer (FMC), serviceable (AMM 34-61-00/501).

 D. Procedure
 S 865-205
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-206

 (2)  
Align the left, center and right IRUs in the NAV mode (Ref 34-21-00/201).

 S 865-207

 (3)  
Push and release the engage switch of the upper yaw damper (P5) to engage the upper yaw damper system. Make sure that the ON annunciator comes on and the INOP annunciator is off.

 S 865-208

 (4)  
Push and release the engage switch of the lower yaw damper (P5) to engage the lower yaw damper system. Make sure that the ON annunciator comes on and the INOP annunciator is off.

 S 865-229

 (5)  
Set the Ground-Test-Enable switch on the P461 Pilot's Overhead Maintenance Panel to the ENABLE position.

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747-400 MAINTENANCE MANUAL
 S 865-231
 (6)  Open the 7C09 UPR YAW DAMPER circuit breaker on the P7 Overhead Circuit Breaker Panel.
 S 715-233
 (7)  Make sure that the INOP annunciator of the upper yaw damper on the Overhead Panel (P5) comes on.
 S 715-234
 (8)  Make sure that the YAW DAMPER UPR indication in amber shows on the main EICAS display: (a) Set the EIU SEL switch on the P2-2 panel to the L position. (b) Make sure that the YAW DAMPER UPR indication (amber) stays. (c) Set the EIU SEL switch on the P2-2 panel to the C position. (d) Make sure that the YAW DAMPER UPR indication (amber) stays . (e) Set the EIU SEL switch on the P2-2 panel to the R position. (f) Make sure that the YAW DAMPER UPR indication (amber) stays.
　
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