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 (4)  S 862-075Make sure that the YAW DAMPER L (R) INOP light is on.
 (5)  S 862-076Put the YAW DMPR test switch on P61 in the L (R) position, then put the switch back to the center position.
 (6)  S 862-077Make sure that the rudder position indicator on the EICAS display unit shows no rudder movement.
 NOTE:____ During this test a YD ACT fault may be shown and a YDM fault will be shown by the left (right) yaw damper module.
 Faults set during this test should be clear after you push the YDM RESET button in the step that follows.
 (7)  S 862-078Close these circuit breakers on the P11 panel and push the RESET button on the front of left (right) yaw damper module: (a) 11A18, YAW DAMPER LEFT (b) 11F34, YAW DAMPER RIGHT
 (8)  S 862-079AIRPLANES WITH YDM -101 THRU -121; Any faultballs that do not reset show that there is a fault.
 (9)  S 862-081AIRPLANES WITH YDM -122 THRU -999; Push the DISPLAY button on the left (right) yaw damper module. If the message NO FAULTS is not displayed on the module, there is a fault.

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757 MAINTENANCE MANUAL
 S 862-083
 (10)
 Put the YAW DMPR test switch on the P61 panel in the L (R) position, then put it back to the center. Make sure that the YAW DAMPER L INOP light comes on in less than 15 seconds.

 S 862-084

 (11)
 Make sure that the rudder position indicator on the lower EICAS display shows this sequence of rudder movement in less than 10 seconds:

 (a)  
The rudder moves approximately 3 degrees trailing edge right.

 (b)  
The rudder moves approximately 3 degrees trailing edge left.

 (c)  
The rudder goes back to the center.

 

 S 862-085
 (12)
 Make sure that the YAW DAMPER L (R) INOP light goes off in less than 15 seconds after the switch is put back to center.

 S 862-086

 (13)
 AIRPLANES WITH YDM -101 THRU -121;
 No faultballs should be set during the test.

 S 862-088

 (14)
 AIRPLANES WITH YDM -122 THRU -999; The NO FAULTS message should be the only message shown on the yaw damper modules after completion of this test if there are no faults.

 E. Put the Airplane Back to It's Usual Condition.
 S 862-149
 (1)  
Put the L, C, and R FLT CONTROL SHUTOFF switches on the P61 panel to the OFF position.

 S 862-090

 (2)  
Remove the power from the left and center hydraulic systems
 (AMM 29-11-00/201).

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

 S 862-091
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757 MAINTENANCE MANUAL
 YAW DAMPER MODULE - REMOVAL/INSTALLATION
________________________________________
 1.  General_______
 A.  Two yaw damper modules are in shelves E3-1 and E4-1 of the electrical/electronic equipment center. Each module has two hold down hooks on the front of the module and one multiple pin connector with three inserts at the rear. The removal/installation steps are the same for each yaw damper module.
 TASK 22-21-04-024-032
 2.  Remove Yaw Damper Module________________________
 A.  References
 (1)  
AMM 20-10-01/401, E/E Rack Mounted Components

 (2)  
AMM 20-41-01/201, Electrostatic Discharge Sensitive Devices

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

 (4)  
AMM 27-21-00/501, Rudder and Rudder Trim Control System

 (5)  
AMM 27-61-00/201, Spoiler/Speedbrake Control System

 (6)  
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 (7)  
AMM 31-41-00/501, Engine Indication and Crew Alerting System
　
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