757 MAINTENANCE MANUAL
 YAW DAMPER SUMMING LEVER - INSPECTION/CHECK
___________________________________________
 1.  General_______
 A. This procedure contains these tasks:
 -
Yaw Damper Shear Pin (or Rivets) - Check

 -
Yaw Damper Summing Lever - Inspection

 TASK 27-21-17-726-001
 2.  Yaw Damper Shear Pin (or Rivets) - Check________________________________________
 A. References
 (1)  
24-22-00/201, Electrical Power - Control

 (2)  
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 B.
Access

 (1)  
Location Zones
 211/212 Control Cabin

 C.
Prepare for the Check

 S 866-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 216-003

 (2)  
Make sure these circuit breakers on the overhead panel, P11, are closed:

 (a)  
11A18, YAW DAMPER LEFT

 (b)  
11F34, YAW DAMPER RIGHT

 (c)  
11C6, CSEU 1L AC
 or FLT CONT ELEC 1L AC

 (d)  
11C7, CSEU 1L DC
 or FLT CONT ELEC 1L DC

 (e)  
11C8, CSEU 2L AC
 or FLT CONT ELEC 2L AC

 (f)  
11C9, CSEU 2L DC
 or FLT CONT ELEC 2L DC

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 ALL  ú ú 02 Page 601 ú May 28/00
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A
757
MAINTENANCE MANUAL

YAW DAMPER  YAW DAMPER 
MECHANISM  SERVO  SHEAR PIN  1 
SEE  A  SUPPORT BRACKET  SUMMING LINK  CRANK ARM INPUT  YAW DAMPER BIAS POGO 
(2 LOCATIONS) 

GROUND SPRING
(2 LOCATIONS)
SUPPORT INPUT CRANK
BRACKET (3 LOCATIONS)
SPRING RETAINER (2 LOCATIONS)
SUMMING CONTROL RODS LEVER TO THE PCAs
INPUT CRANK INPUT CRANK
(3 LOCATIONS)
GROUND SPRING
SUMMING
(2 LOCATIONS) BOLTLEVER BUSHING
A
WASHER NUT
CONTROL RODS TO THE PCAs BOLT
WASHER
BUSHINGSERVO NUTLINKAGE
A-A
SEE B
A
SHEAR RIVETS 2 SERVORATIO CHANGER SUMMING LINKPOGO
YAW DAMPER
SERVOS
BOLT WASHER NUT (2 LOCATIONS)
FWD INBD
YAW DAMPER MECHANISM
YAW DAMPER SERVOS
A
SERVO LINKAGE
AIRPLANES WITH SHEAR PINS
1
B
AIRPLANES WITH SHEAR RIVETS2
Yaw Damper Summing Lever Inspection
Figure 601

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 (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

 S 866-004
 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)  
Supply pressure to the left, right, and center hydraulic systems (Ref 29-11-00/201).

 S 866-005

 (4)  
Push the STATUS switch on the pilots' display select panel, P9, to show the rudder position indicator on the bottom EICAS display.

 S 866-006

 (5)  
Move the YAW DAMPER test switch on the right side panel, P61, to L and release it.

 NOTE:____The YAW DAMPER L INOP light will come on. The light will go off approximately 5 seconds after you release the test switch.
　
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