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747-400 MAINTENANCE MANUAL
 (f)  If INHIBITED shows above <UPR YDM ACTUATOR or <LWR YDM ACTUATOR: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the ground
 test menu again.
 F.  Yaw Damper Actuator Ground Test
 S 745-183
 (1)  Push the LSK that is adjacent to the applicable prompt (<UPR YDM ACTUATOR or <LWR YDM ACTUATOR)
 (a)  
When the TEST PRECONDITIONS page shows, make sure each instruction on the page is completed. 1) Push the LSK that is adjacent to START TEST>.

 (b)  
Make sure that only the INOP annunciator of the upper yaw damper (or lower yaw damper) (P5) comes on for the UPR YDM ACTUATOR (or LWR YDM ACTUATOR) test.

 (c)  
Continue with the instructions shown on the CDU to complete the test.

 NOTE: IN PROGRESS shows during the test.
____
 S 745-184
 (2)  When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <UPR YDM ACTUATOR or <LWR YDM ACTUATOR.
 NOTE: If a PASS indication shows, no failures occurred during the
____
 test.

 (a)  If FAIL> shows: 1) Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG pages for the failure. 2) Push the NEXT PAGE key until you find all the GROUND TEST MSG pages. 3) Make a list of all CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages.
 4)  Go the the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
 G.  Put the Airplane Back to Its Usual Condition
 S 865-185
 (1)  
Set the GND TESTS switch to the NORM position.

 S 865-186

 (2)
Push and release the engage switch of the upper (or lower) yaw damper on the P5 panel to disengage the yaw damper system.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 S 865-187
 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 865-188

 (4)  
Remove hydraulic power if it is not necessary (AMM 29-11-00/201).

 S 865-228

 (5)  
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).

 TASK 22-21-00-745-190
 4. Ground Test - Yaw Damper
________________________
 A. General
 (1)  This test is for an internal check of the yaw damper module (YDM) function and to make sure the interface between the YDM and the accelerometers are satisfactory for each of the YDMs installed.
 B. References
 (1)  
AMM 11-20-03/201, Overhead Panel

 (2)  
AMM 22-11-01/401, FCC Software Installation

 (3)  
AMM 24-22-00/201, Manual Control

 (4)  
AMM 34-21-00/201, Inertial Reference System

 (5)  
AMM 34-61-00/501, Flight Management Computer System

 (6)  
AMM 34-61-02/401, Control Display Unit

 (7)  
AMM 45-10-00/501, Central Maintenance Computer System

 C. Access
 (1)  Location Zones
 221 Control Cabin, LH
 222 Control Cabin, RH

 D. Preconditions
 S 865-257
 (1)  These conditions are necessary for this task:
 (a)  
Electrical Power On (AMM 24-22-00/201).

 (b)  
Central Maintenance Computer (CMC), serviceable (AMM 45-10-00/501).

 (c)  
Control Display Unit (CDU), serviceable (AMM 34-61-02/401).

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

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

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

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

 E. Prepare for the Test
　
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