____________________________________
 ú A. General GUNú B. General GUNú GUNúú NOTE:
____Verify the part number of the Yaw Damper Module before testing. ú
 C.  References
 (1)
24-22-00/201, Electrical Power - Control

 (2)
27-21-00/501, Rudder and Rudder Trim Control System

 (3)
27-61-00/201, Spoiler/Speedbrake Control System

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

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

 (6)
32-09-02/201, Air/Ground Relays

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

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

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

 D.  Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Control Cabin

 (2)  
Access Panel
 119BL Main Equipment Center

 E.  Prepare for Test
 S 865-006
 (1) Supply electrical power (Ref 24-22-00).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-21-00
 ALL  ú ú GUN.1 Page 501 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 S 865-007
 (2)  Make sure that these circuit breakers on the overhead circuit breaker panel, P11, are closed:
 (a)  
11A18, YAW DAMPER LEFT

 (f)  
11F34, YAW DAMPER RIGHT

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

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

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

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

 (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 865-001
 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.
 (3)  
Pressurize the left, center, and right hydraulic systems (Ref 29-11-00).

 S 865-008

 (4)  
Make sure that these circuit breakers on the P11 panel are closed:

 (a)  
11H17, FLT CONT SHUTOFF TAIL LEFT

 (b)  
11H18, FLT CONT SHUTOFF TAIL CENTER

 (c)  
11H28, FLT CONT SHUTOFF TAIL RIGHT

 S 985-338
 (5)  Put the L, C, and R FLT CONTROL SHUTOFF switches on the P61 panel in the ON position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 03 Page 502 ú Mar 20/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 865-339
 (6)  Make sure these systems operate:
 (a)  
Rudder and Rudder Trim Control System (Ref 27-21-00)

 (b)  
Air Data Computing System (Ref 34-12-00)

 (c)  
Inertial Reference System (aligned and in NAV mode) (Ref 34-21-00)

 (d)  
Air/Ground Relays (Ref 32-09-02)

 (e)  
Master Dim and Test System (Ref 33-16-00)

 (f)  
Engine Indication and Crew Alerting System (Ref 31-41-00).

 (g)  
Select STATUS on EICAS display select panel on panel P9.

 F. Test Yaw Damper System Operation
 S 985-010
 (1)  
Push the RESET button on the left and right yaw damper modules. Stop for 30 seconds before you continue.
　
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