S 862-003
(2)
Remove the pressure from the left, the center and the right hydraulic systems (Ref 29-11-00).
S 862-004
(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.
S 862-005
(4)
Set the two F/D switches on the MCP in the OFF position.
S 862-006
(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
(e)
For the center servo: 1) 11E20, FLT CONT CMPTR PWR CENTER 2) 11E21, FLT CONT CMPTR SERVO CENTER
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A
757
MAINTENANCE MANUAL
SEE A
TORQUE TUBES OUTPUT RODS APCS (3 LOCATIONS) TORQUE BOX
LEFT APCS SEE B
CENTER APCS SEE B
RIGHT APCS
SEE B FEEL AND CENTERING FWD
UNIT
A
OUTBD
APCS Electrohydraulic Servo Valve and Solenoid Valves Figure 201 (Sheet 1)
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A
757
MAINTENANCE MANUAL
HYDRAULIC RETURN
0-RINGS
GASKET PLATE
ELECTRICAL CONNECTOR
HYDRAULIC
PRESSURE
SOLENOID
VALVE 1 SOLENOID
VALVE 2
SERVOVALVE
SCREW AND WASHER (4 EACH VALVE)
TYPICAL APCS ELECTROHYDRAULIC SERVO VALVE AND SOLENOID VALVES
B
APCS Electrohydraulic Servo Valve and Solenoid Valves
Figure 201 (Sheet 2)
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(f) For the right servo: 1) 11E35, FLT CONT CMPTR PWR RIGHT 2) 11E36, FLT CONT CMPTR SERVO RIGHT
S 012-007
WARNING:_______STAY OFF THE CONTROLS BAY ACCESS DOOR, 313AL. THE WEIGHT OF PERSONS ON THIS DOOR COULD CAUSE ITS SPRING-LOADED LATCHES TO RELEASE. PERSONS COULD FALL THROUGH THE OPENING AND BE INJURED.
WARNING: STAY OFF THE SERVICE ACCESS DOOR, 311AL, IF IT IS OPENED (NOT) NECESSARY FOR THIS PROCEDURE). THE WEIGHT OF PERSONS ON THIS DOOR COULD CAUSE ITS SPRING-LOADED LATCHES TO RELEASE. PERSONS COULD FALL THROUGH THE OPENING AND BE INJURED.
(6) Open access panel 313AL (Ref 06-42-00).
D. Remove the Valves.
S 102-008
CAUTION: DO NOT LET ANY CONTAMINATION GET INTO THE ELEVATOR AUTOPILOT
_______ SERVO AND VALVES. CONTAMINATION MAY CAUSE EQUIPMENT DAMAGE AND/OR FAILURE.
(1)
Fully clean the external areas of the valve and around the surface of the valve where it attaches to the servo.
S 032-009
(2)
Remove the screws and washers from the valve assembly.
S 032-010
(3)
Remove the valve assembly.
S 032-011
(4)
Remove the O-ring.
(5)
Remove the gasket plate.
(6)
Put covers on all openings.
S 032-012
S 432-013
TASK 22-12-02-422-019
3. Install the APCS Servovalve or Solenoid Valve_____________________________________________
A. Consumable Materials
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