757
MAINTENANCE MANUAL

 (b)  Push the erase switch for 3 seconds to erase the EICAS maintenance memory.
 S 215-268
 (7)  
Do these steps to make sure no RUDDER PCU messages stay on the EICAS status and maintenance pages:

 (a)
Push the STATUS switch on the P9 panel and do this check:

 1)  Make sure no RUDDER PCU message comes into view on the bottom EICAS display.

 (b)
Push the ECS/MSG switch on the P61 panel and do this check:

 1)  Make sure no RUDDER PCU message comes into view on the bottom EICAS display.
 S 215-269
 (8)  
Move the captain's right pedal to its full forward position (slowly) and do these steps:

 (a)  
Move the RUDDER DISPLACEMENT switches to RIGHT on the two yaw damper module simulators.

 (b)  
Do these steps to make sure a RUDDER PCU message comes into view on the EICAS status and maintenance pages: 1) Push the STATUS switch on the P9 panel and do this check:

 a)  Make sure a RUDDER PCU message comes into view on the bottom EICAS display. 2) Push the ECS/MSG switch on the P61 panel and do this check: a) Make sure a RUDDER PCU message comes into view on the bottom EICAS display.

 (c)  
Open this circuit breaker on the P11 panel and attach a DO-NOT-CLOSE tag: 1) 11D18 or 11G10, RUDDER RATIO

 (d)  
Stop for 30 seconds.

 (e)  
Do these steps to erase the EICAS memory: 1) Push the ECS/MSG switch, then the AUTO EVENT switch on the P61 panel.

 2)  Push the erase switch for 3 seconds to erase the EICAS maintenance memory.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A

757 MAINTENANCE MANUAL
 (f)  Do these steps to make sure no RUDDER PCU messages stay on the EICAS status and maintenance pages: 1) Push the STATUS switch on the P9 panel and do this check:
 a)  Make sure no RUDDER PCU message comes into view on the bottom EICAS display. 2) Push the ECS/MSG switch on the P61 panel and do this check: a) Make sure no RUDDER PCU message comes into view on the bottom EICAS display.
 S 865-270
 (9)  
Move the captain's right pedal back to its neutral position.

 S 865-271

 (10)
 Move the RUDDER DISPLACEMENT switches to OFF on the two yaw damper module simulators.

 S 035-272

 (11)
 Disconnect connectors D4710, D4714, and D4712 from the test box.

 S 435-273

 (12)
 Connect PCA sensor connectors D4710, D4714, and D4712 to the top, middle, and bottom PCA sensors.

 S 025-623

 (13)
 Remove the two yaw damper module simulators.

 S 425-622

 (14)
 Install the two yaw damper modules (M522, M523) (AMM 22-21-04/401).

 Q.  
Force Fight at Rudder Neutral - Test

 NOTE: Before you do the test, make sure the airplane is stable at
____ ambient air temperature |10.0 degrees F (|5.5 degrees C) for at least one hour.
 S 865-274
 (1)  Remove the power from the center and right hydraulic systems (AMM 29-11-00/201)
 NOTE: Only the left hydraulic system will have power.
____
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A

757
MAINTENANCE MANUAL

 S 215-275
 (2)
Make sure the rudder is in its neutral position (approximately).

 S 975-276

 (3)  
Measure the rudder position.

 NOTE: This is the rudder neutral datum position.
____
 S 865-277
 (4)  
Remove the power from the left hydraulic system
 (AMM 29-11-00/201).

 S 865-278

 (5)  
Supply pressure to the right hydraulic system
　
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