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A

757 MAINTENANCE MANUAL
 AUTOPILOT LATERAL CONTROL SERVO - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A.  The left, center, and right autopilot lateral control servos (ALCSs) are in the main landing gear wheel well. The left and center ALCSs are left of the keel beam, with the left in the forward position and the center in the aft position. The right ALCS is to the right of the keel beam.
 B.  You must fully remove the control rod before you remove the servo. After the installation of the servo, the control rod is installed again.
 C.  Two adjustment procedures are given for the Autopilot Lateral Control Servo:
 (1)
Adjustment with the Maintenance Control Display Panel (MCDP)

 (2)
Adjustment with the Phase Synchronous Voltmeter Model 101A

 TASK 22-13-03-004-001
 2.  Remove the Autopilot Lateral Control Servo__________________________________________
 A.  Equipment
 (1) Rig Pins from Set B20003-XX (Ref 20-10-24)
 (a)
A1-P/N B20003-27

 (b)
A2-P/N B20003-27

 B.  References
 (1)
20-10-24/201, Rig Pins

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

 (3)
29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 C.  Access
 (1)  
Location Zones
 732/742 Main Landing Gear Body Door

 (2)  
Access Panels
 732/742 Main Landing Gear Body Door

 D.  Prepare for Removal
 S 864-002
 (1) Supply electrical power (Ref 24-22-00).
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 ALL  ú ú 01 Page 401 ú Sep 20/92
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757
MAINTENANCE MANUAL

 S 864-003
 (2)  
Remove pressure from the L, C, and R hydraulic systems (Ref 29-11-00).

 S 864-004

 (3)  
Set the two F/D switches on the MCP to OFF.

 S 864-005

 (4)  
Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:

 (a)  
11E17, FLT CONT COMPUTER POWER LEFT

 (b)  
11E18, FLT CONT COMPUTER SERVO LEFT

 (c)  
11E20, FLIGHT CONT CMPTR PWR CENTER

 (d)  
11E21, FLIGHT CONT CMPTR SERVO CENTER

 (e)  
11E35, FLT CONT CMPTR PWR RIGHT

 (f)  
11E36, FLT CONT CMPTR SERVO RIGHT

 E. Remove the Servo
 S 984-006
 (1)  
Rotate the quadrants until the rig pins A1 and A2 can be freely put in the left and right quadrant assemblies.

 S 434-007

 (2)  
Install the rig pins.

 S 034-008

 (3)  
Remove the electrical connector from the ALCS.

 S 034-009

 (4)  
Disconnect the hydraulic lines from the servo.

 S 034-010

 (5)  
Loosen the jamnut (13) on the control rod at the servo output crank rod end.

 NOTE: The servo output crank rod end is part of the servo output
____
 crank.

 S 034-011
 (6)  
Remove the bolt (2), the nut (4), and the washer (3) to disconnect the control rod (5) from the quadrant assembly autopilot crank.

 (7)
Remove the control rod (5) from the servo output crank rod end.

 S 034-012
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 22-13-03
 ALL  ú ú 02 Page 402 ú Mar 20/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL

ALCS (3)SEE A CABLES TO F/O'S
CONTROL WHEEL (REF)CABLES TO CAPTAIN'SCONTROL WHEEL (REF)
KEELBEAM(REF)
LATERAL FEEL, BUSLATERAL CONTROL
　
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