757
MAINTENANCE MANUAL
TASK 22-12-01-824-026
5. Adjust the Autopilot Pitch Control Servo with the Maintenance Control
_____________________________________________________________________
Display Panel (MCDP)
____________________
A. Parts
~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 4 | Bolt | 27-31-53| 01 | 95 | | | 5 | Washer | | | 97 | | | 6 | Nut | | | 99 | | | 7 | Rod Assembly | | | 101 | 2......…........…...................................…..........…......…........1
B. References
(1)
22-00-02/201, Autoflight BITE
(2)
29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(3)
34-11-00/201, Pitot-Static System (Pressurization)
C. Access
(1)
Location Zone 313 Stabilizer Center Section Compartment (Left)
(2)
Access Panel
313AL Control Bay Access Door
D. Prepare to Adjust
S 864-069
(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 864-075
(2) On panel P61, remove the DO-NOT-OPERATE tags and set the L, C and R FLT CONTROL SHUTOFF switches in the ON position.
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22-12-01
ALL ú ú 01 Page 408 ú Sep 20/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 864-070
WARNING:_______STAY OFF ALL OF THE CONTROL SURFACES. THE CONTROL SURFACES USE HYDRAULIC POWER AND MAY MOVE WHEN ANY CONTROLS ARE MOVED OR WHEN THE HYDRAULIC SYSTEMS ARE PRESSURIZED. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3)
Supply hydraulic pressure (Ref 29-11-00).
S 864-076
(4)
Manually operate the elevator system three times.
S 864-071
(5)
Make sure these circuit breakers on the P11 panel are closed:
(a)
11C30, LANDING GEAR POS SYS 1
(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 864-072
(6)
Pressurize the elevator feel pitot system to 350 knots (Ref
34-11-00).
S 864-073
(7)
Set the stabilizer trim to six units of trim.
S 834-039
(8)
Install the rig pin E/ST 7 (Ref 20-10-24).
(9)
Set the MCDP to Ground Test 66-XDCR OUTPUTS (Ref 22-00-02).
S 864-077
(10)
Use the YES/ADV switch to move the test forward until the top line of the MCDP shows 66-ELEV SURF DEG.
S 864-074
E. Adjust the Autopilot Pitch Control Servo
S 824-035
(1) With the control rod connected to the servo output crank, adjust the servo output control rod until the value on the bottom line of the MCDP display is 1.1 |0.2 degrees.
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