(2)  
Access Panel
 119BL Main Equipment Center

 C. Procedure
 S 844-005
 CAUTION: DO NOT TOUCH THE YAW DAMPER MODULE BEFORE YOU DO THE PROCEDURE
_______ FOR ELECTROSTATIC DISCHARGE SENSITIVE DEVICES (AMM 20-41-01/201). ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE YAW DAMPER MODULE.
 (1)  
Do the procedure for electrostatic discharge sensitive devices (AMM 20-41-01/201).

 S 424-036

 (2)  
Install the yaw damper module (AMM 20-10-01/401).

 D. Yaw Damper Module Test
 S 864-006
 (1)  
Apply electrical power (AMM 24-22-00/201).

 S 864-007

 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel for left module:

 (a)  11A18, YAW DAMPER LEFT
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 (b)  11C6,  CSEU 1L AC
 or
 FLT CONT ELEC 1L AC
 (c)  11C7,  CSEU 1L DC
 or
 FLT CONT ELEC 1L DC
 (d)  11C8,  CSEU 2L AC
 or
 FLT CONT ELEC 2L AC
 (e)  11C9,  CSEU 2L DC
 or
 FLT CONT ELEC 2L DC

 S 864-008
 (3)  Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel for right module:
 (a)  
11F34, YAW DAMPER RIGHT

 (b)  
11G17, CSEU 1R AC or FLT CONT ELEC 1R AC

 (c)  
11G18, CSEU 1R DC or FLT CONT ELEC 1R DC

 (d)  
11G27, CSEU 2R AC or FLT CONT ELEC 2R AC

 (e)  
11G28, CSEU 2R DC or FLT CONT ELEC 2R DC

 S 284-009
 (4)  
Make sure that the engine indication and crew alerting system is operational (AMM 31-41-00/501).

 S 984-010

 (5)  
Push the STATUS switch on the EICAS display select panel on the control stand panel, P9.

 S 864-011
 WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO A PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
 (6)  For the left yaw damper system, pressurize the left hydraulic system (AMM 29-11-00/201).
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 S 864-013
 (7)  For the right yaw damper system, pressurize the center hydraulic system (AMM 29-11-00/201).
 S 284-014
 (8)  Make sure these systems operate. (a) Rudder and Rudder Trim Control System (AMM 27-21-00/501) (b) Air Data Computing System (AMM 34-12-00/501) (c) Inertial Reference System (AMM 34-21-00/501) (d) Air/Ground Relays (AMM 32-09-02/201) (e) Master Dim and Test System (AMM 33-16-00/501)
 S 984-015
 (9)  Push the left or right YAW DAMPER switch/light on the P5 panel as necessary. (a) Make sure that ON is on. (b) Make sure that the applicable YAW DAMPER L or R INOP light is off.
 S 984-018

 (10) For the left yaw damper module, put the YAW DMPR test switch on the P61 panel in the L position, then put the switch back to center.
 (a)  
Make sure that the YAW DAMPER L INOP light is on.

 (b)  
Make sure that the rudder position indicator on the lower EICAS display (AMM 31-41-00/501) shows this sequence of rudder movement in less than 10 seconds. 1) The rudder moves approximately 3 degrees trailing edge

 right 2) The rudder moves approximately 3 degrees trailing edge left 3) The rudder goes back to the center.

 (c)  
Make sure that the YAW DAMPER L INOP light goes off in less than 15 seconds.

 S 984-022
 (11) For the right yaw damper module, put the YAW DMPR test switch on the P61 panel in the R position, then put the switch back to center.
　
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