S 982-056

 (3)  
Put the R and C STAB TRIM switches in the NORM position.

 S 862-057

 (4)  
Remove the power from the left and center hydraulic systems (AMM 29-11-00/201).

 S 862-058

 (5)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 22-21-03-712-064
 5.  Yaw Damper Electrohydraulic Servo Valve and Solenoid Valve Operational Check_____________________________________________________________________________
 NOTE: This is a scheduled maintenance task.
____
 A. References
 (1)  
AMM 06-42-00/201, Empennage (Major Zone 300) Access Doors and Panels

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 (3)  
AMM 27-21-00/501, Rudder and Rudder Trim Control System

 (4)  
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 (5)  
AMM 31-41-00/501, Engine Indication and Crew Alerting System

 (6)  
AMM 32-09-02/201, Air/Ground Relays

 (7)  
AMM 33-16-00/501, Master Dim and Test

 (8)  
AMM 34-12-00/501, Air Data Computing System

 (9)  
AMM 34-21-00/501, Inertial Reference System

 B. Access
 (1)  Location Zones 119 Main Equipment Center 211/212 Flight Compartment 324 Vertical Stabilizer - rear spar to trailing edge
 C. Prepare for Test
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757 MAINTENANCE MANUAL
 S 862-065
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILER PANELS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the spoiler panels.

 S 862-066

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 862-067

 (3)  
Put the L, C, and R FLT CONTROL SHUTOFF switches on the panel P61 in the ON position.

 S 862-068

 (4)  
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 32-09-02/501)

 (e)  
Master Dim and Test System (AMM 33-16-00/501)

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

 S 862-072
 (5)  Push the STATUS switch on the EICAS display select panel, on panel P9, to the flight control positions.
 S 862-073
 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 PERSON 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).

 S 862-074

 (7)  
For the right yaw damper system, pressurize the center hydraulic system (AMM 29-11-00/201).

 D. Valves Test
 S 862-069
 (1)  Push the YAW DAMPER L or R switch/light on the P5 panel make sure that ON light comes on.
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757
MAINTENANCE MANUAL

 (2)  S 862-070Make sure that the applicable YAW DAMPER L or R INOP light is off.
 NOTE:____ Two persons are necessary for the steps below. One is necessary in the flight compartment and one in the main electrical/electronic equipment center.
 (3)  S 862-071Open this circuit breaker on the P11 panel to stop the operation of the left (right) servo. (a) 11A18, YAW DAMPER LEFT (11F34, YAW DAMPER RIGHT)
　
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