S 722-078
(10)
Move the rudder pedals through their full travel range and do these checks:
(a)
Make sure the rudder operates correctly and smoothly through its full travel range.
(b)
Make sure the rudder position indicator operates correctly and moves to its full scale mark in each direction.
S 792-079
(11)
Make sure there are no leaks of hydraulic fluid at the RRCA.
S 712-078
(12)
If the RRCA was replaced, do the operational test for the rudder ratio changer modules (Ref 27-21-00).
M.
Put the Airplane Back to Its Usual Condition
S 442-080
WARNING: STAY AWAY FROM THE NOSE WHEELS WHEN THE LOCKPIN IS REMOVED.
_______ THE WHEELS CAN TURN TO THE CENTER POSITION QUICKLY, AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1)
Make sure the nose wheels are in their center position and remove the towing lever lockpin from the nose gear (Fig. 202).
(2)
Close access panels 324AL and 324BL (Ref 06-42-00).
S 412-081
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A
757
MAINTENANCE MANUAL
S 492-082
(3) Remove the cover from the APU inlet area.
S 862-083
CAUTION:_______PUT THE RRCM TEST SWITCH TO THE "NORMAL" POSITION. IF THE RRCM TEST SWITCH IS IN THE TEST POSITION THE AMBER "RUDDER RATIO" LIGHT WILL COME ON AND THE AIRPLANE CAN NOT DISPATCH.
(4)
Make sure the RRCM test switches are in their NORMAL positions.
S 862-084
(5)
Remove the power from the left, right, and center hydraulic systems (Ref 29-11-00).
S 862-085
(6)
Remove 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
YAW DAMPER SUMMING LEVER - REMOVAL/INSTALLATION
_______________________________________________
1. General________
A. This procedure contains the removal and installation tasks for the yaw damper summing lever.
TASK 27-21-17-024-005
2. Yaw Damper Summing Lever - Removal__________________________________
A. Equipment
(1)
Rig Pins from Set B20003-XX (Ref 20-10-24/201):
(a)
R3 - P/N B20003-16
(2)
Nose Gear Towing Lever
Lockpin - A09003-1
B.
References
(1)
06-42-00/201, Empennage Access Doors and Panels
(2)
20-10-24/201, Rig Pins
(3)
24-22-00/201, Electrical Power - Control
(4)
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems
C.
Access
(1)
Location Zone 324 Vertical Stabilizer - Rear Spar to Trailing Edge
(2)
Access Panels 324AL Body to Fin Seal 324BL Aft Side of Rear Spar and Rudder Hinge 324CL Rudder Hinge and PCUs
D.
Prepare for the Removal (Fig. 401)
S 014-011
(1)
Open access panels 324AL, 324BL, and 324CL (Ref 06-42-00/201).
(2)
Supply electrical power (Ref 24-22-00/201).
S 864-006
S 864-030
WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
(3) Supply pressure to the left, right, and center hydraulic systems (Ref 29-11-00/201).
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