22-12-02
 ALL  ú ú 01 Page 204 ú Dec 20/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

 (2)  D00013 Grease - MIL-G-23827
 B. Access
 (1)  
Location Zone 313 Stabilizer Center Section Compartment (Left)

 (2)  
Access Panels
 313AL Controls Bay Access Door

 C. Install the Valve.
 S 032-014
 (1)  
Remove the covers from all openings.

 S 112-015

 (2)  
Clean the surfaces of valve that will attach to the servo the new seal plate, the O-ring, and the servo assembly with clean hydraulic fluid. Do not allow the hydraulic fluid to go into the electrical connector.

 S 432-016

 (3)  
Install the O-ring.

 S 432-019

 (4)  
Install the gasket plate.

 S 422-018

 (5)  
Put the valve assembly in its position on the servo.

 S 642-017

 (6)  
Apply a layer of grease to the screws.

 S 432-014

 (7)  
Install the screws and the washers to attach the valve to the servo assembly.

 (a)  Tighten screws to 50-70 inch-pounds.
 TASK 22-12-02-702-020
 4. Test the APCS Electrohydraulic Servovalve and Solenoid Valves
_____________________________________________________________
 A. References
 (1)  
22-00-02/201, Autoflight BITE

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

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-12-02
 ALL  ú ú 01 Page 205 ú Dec 20/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

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

 (2)  
Access Panels
 313AL Controls Bay Access Door

 C. Prepare to Test the Valves
 S 862-020
 (1)  Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
 (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

 (g)  
11H17, FLT CONT SHUTOFF TAIL LEFT

 (h)  
11H18, FLT CONT SHUTOFF TAIL CENTER

 (i)  
11H28, FLT CONT SHUTOFF TAIL RIGHT

 S 012-021
 (2)  Remove the DO-NOT-OPERATE tags from the left, center, and right FLT CONT SHUTOFF switches on panel P61 and set them in the ON position.
 S 782-022
 WARNING:_______STAY OFF ALL OF THE CONTROL SURFACES. THE CONTROL SURFACES CAN MOVE WHEN CONTROLS ARE MOVED OR WHEN THE HYDRAULIC SYSTEMS ARE PRESSURIZED. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Pressurize the left, center and right hydraulic systems.

 S 982-023

 (4)  
Manually operate the elevator system three times.

 D. Test the Valves
 S 862-024
 (1)  Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 22-12-02
 ALL  ú ú 09 Page 206 ú Dec 20/94
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A

757
MAINTENANCE MANUAL

 (a)  
　
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