(b)
11E16, MODE CONT PNL LEFT
(c)
11E34, MODE CONT PNL RIGHT
(d)
GUN 001-050, 052-999;
11S4, MAINT CONT DSPL
(e)
GUN 051;
11S6, MAINT CONT DSPL
(f)
11S15, AIR/GND SYS 1
(g)
11S19, AIR/GND SYS 2
(h)
11S23, POS SYS 2
S 864-083
(6)
Pressurize the elevator feel pitot system to 350 knots (Ref 34-11-00).
S 864-084
(7)
Set the stabilizer trim to six units of trim.
S 864-085
(8)
Set the MCDP to Ground Test 66-XDCR OUTPUTS (Ref 22-00-02).
S 864-086
(9)
Use the YES/ADV switch to move the test forward until the top line of the MCDP shows 66-ELEV SURF DEG.
D. Test the Autopilot Pitch Control Servo Installation
S 214-056
(1)
With the control column released, make sure the MCDP shows 1.1 |0.2 degrees on the bottom line of the display.
S 984-057
(2)
Move the control column to the full forward position.
(a) Make sure the value on the bottom line of the MCDP display is more than +5 degrees for the left, center and right servos.
S 984-037
(3) Move the control column to the full aft position.
(a) Make sure the value on the bottom line of the MCDP display is more than -5 degrees (-6 or subsequent) for the left, center and right servos.
S 744-059
(4) Do the MCDP Ground Test 08-SERVO ELEV (Ref 22-00-02).
(a) Make sure no MCDP fault messages show during the test.
S 214-036
(5) Examine the Autopilot Pitch Control Servo for leaks and fix them as necessary.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
E. Put the Airplane Back to its Usual Condition
S 414-061
(1)
Close the service access panel 313AL.
S 044-062
(2)
Set the MCDP to off.
S 864-046
(3)
Slowly release the pressure from the elevator feel pitot system (Ref 34-11-00).
S 864-063
(4)
Remove the hydraulic power if it is not necessary (Ref 29-11-00).
S 864-064
(5)
Remove the electrical power if it is not necessary (Ref 24-22-00).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
APCS ELECTROHYDRAULIC SERVOVALVE AND SOLENOID VALVES - MAINTENANCE PRACTICES
____________________________________________________________________________
1. General (Fig. 201)_______
A. There are three autopilot pitch control servos. They are attached to the torque box that is aft of the horizontal stabilizer at section 48 of the airplane. Each servo has two LRU solenoid valves and one LRU electrohydraulic servovalve.
B. This procedure includes tasks to remove, install, and test the servovalve and solenoid valves. The tasks are the same for the two types of valves.
TASK 22-12-02-002-001
2. Remove the APCS Servovalve or Solenoid Valve____________________________________________
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 Panels
313AL Controls Bay Access Door
C. Prepare to Remove the Valve. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 1(145)
