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757 FAULT ISOLATION/MAINT MANUAL
ELECTRICAL ELECTROHYDRAULICCONNECTOR (REF) SERVO VALVE
ELECTROHYDRAULIC SOLENOID VALVE NO. 1
ELECTROHYDRAULIC SOLENOID VALVE NO. 2
LEFT, CENTER, OR RIGHT AUTOPILOT PITCH CONTROL SERVO M271,M272 OR M273
CENTER ELEVATOR NEUTRAL SHIFT  GREEN TAPE (REF)  B  FROM SHT 1 
TRANSDUCER,  LEFT ELEVATOR 
TS5151  NEUTRAL SHIFT 
TRANSDUCER, TS5153  CONTROL COLUMNS 
SEE  D 

FORWARD EQUIPMENT CENTER ACCESS DOOR,113AL
FWD
RIGHT ELEVATOR CAPTAIN FIRST
NEUTRAL SHIFT OFFICER
TRANSDUCER, GREEN TAPE (REF) TS5152
FEEL AND CENTERING UNIT ASSEMBLY (REF)
C FROM SHT 1
FLIGHT COMPARTMENT FLOOR (REF)
LEFT ELEVATOR CONTROL FORCE TRANSDUCER, RIGHT ELEVATOR CONTROLTS15 1 FORCE TRANSDUCER,
TS14 1
CONTROL COLUMNS (VIEW IN THE FORWARD DIRECTION)
D
1 AIRPLANES WITH CONTROL WHEEL STEERING
Autopilot/Flight Director Pitch Channel - Component Location Figure 102 (Sheet 2)
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757 MAINTENANCE MANUAL
 AUTOPILOT PITCH CONTROL SERVO - REMOVAL/INSTALLATION
____________________________________________________
 1.  General (Fig. 401)_______
 A.  There are three autopilot pitch servos. They are attached to the torque box aft of the horizontal stabilizer at section 48 of the airplane.
 B.  This procedure includes tasks to remove, install, adjust, and test the Autopilot Pitch Control Servo. A task is also included to replace the control rod.
 C.  There are two tasks to adjust the Autopilot Pitch Control Servo:
 (1)
Adjustment with the Maintenance Control Display Panel (MCDP)

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

 TASK 22-12-01-004-065
 2.  Remove the Autopilot Pitch Control Servo________________________________________
 A.  References
 (1)  
06-42-00/201, Empennage (Major Zone 300) Access Doors and Panels

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

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

 B.  Access
 (1)  
Location Zone 313 Stabilizer Center Section Compartment (Left)

 (2)  
Access Panel
 313AL Control Bay Access Door

 C.  Prepare for Removal
 S 864-001
 (1)  
Supply electrical power (Ref 24-22-00).

 S 864-002

 (2)  
Remove the pressure from the left, center and right hydraulic systems (Ref 29-11-00).

 S 864-003

 (3)  
On right side panel, P61, set the L, C and R FLT CONTROL SHUTOFF switches in the OFF position and attach DO-NOT-OPERATE tags.

 (4)  
Set the two F/D switches on the MCP in the OFF position.

 S 864-005

 (5)  
Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:

 (a)  
11H17, FLT CONT SHUTOFF LEFT

 (b)  
11H18, FLT CONT SHUTOFF CENTER

 (c)  
11H28, FLT CONT SHUTOFF RIGHT

 (d)  
For the left servo: 1) 11E17, FLT CONT COMPUTER POWER LEFT 2) 11E18, FLT CONT COMPUTER SERVO LEFT

 S 864-004
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757
　
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