(g)
Tighten the locknut for the rod end.
(h)
Connect the pushrod to the pedal arm.
(i)
Remove rig pins R-1, R-2, and R-3.
S 735-130
(3)
Do these steps to find if the rudder forward quadrants are adjusted correctly.
(a)
Install rig pin R-4 in the feel, centering, and trim mechanism (Fig. 502).
(b)
Make sure rig pin R-3 goes freely in the forward quadrant. If it does not, adjust cables RA and RB (Fig. 501).
S 735-131
(4)
Do these steps to make sure the tension in cables RA and RB is correct.
(a)
Use a cable tensiometer to make sure the cables have the tension shown in figure 503. 1) If the cable tension is more than 15 pounds different from
the specified tension in figure 503, adjust the cables RA and RB.
S 835-034
(5)
Do these steps to adjust cables RA and RB (Fig. 501, and 502)
(a)
Make sure rig pin R-4 is in the feel, centering, and trim mechanism.
(b)
If you installed new cables, RA and RB, then do these steps: 1) Install rig pin R-3 in the forward quadrant. 2) Adjust the two turnbuckles, at the same time, until cables
RA and RB have a tension of 230-270 pounds. 3) Remove rig pins R-3 and R-4. 4) Move the rudder pedals through 25 cycles. 5) Install rig pin R-4 in the feel, centering, and trim
mechanism.
(c)
Adjust the turnbuckles for cables RA and RB until you get these results: 1) Rig pin R-3 fits freely in the forward quadrant. 2) Cables RA and RB have the tension shown in Figure 503.
(d)
Remove rig pins R-3 and R-4.
(e)
Move the rudder pedals through one cycle.
(f)
Make sure the tension in the cables is correct (Fig. 503).
(g)
Apply a thin layer of corrosion preventive compound to the threads of the turnbuckles.
(h)
Install the clip locks on all of the turnbuckles.
S 735-132
(6)
Do these steps to make sure the rudder trim is adjusted correctly (Fig. 504).
(a)
Install rig pin R-4 in the feel, centering, and trim mechanism.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400
MAINTENANCE MANUAL
RB-3 R RA-4 B-4
RB-2 RA-3
RA-2
RB-3A
RA-3A
TURNBUCKLES
TENSION IN THE CABLE (LBS)
RB-1 RA-1
NOTE:THE TEMPERATURE OF THE AIRPLANE MUST BE |5`F OF THE AMBIENT TEMPERATURE AND MUST BE STABLE FOR AT LEAST 1 HOUR.
180
160
140 120 150 |10 LBS AT 70`F, THE CORRECT CABLE TENSION IS
100 SPECIFIED TENSION
80 TOLERANCE |10 LBS
-40-20 0 20 40 60 80100120
AMBIENT TEMPERATURE (DEGREES F)
RA AND RB CABLE TENSION LOADS
1 THE CABLES MUST BE ADJUSTED IF THE TENSION IN THEMIS MORE THAN |15 POUNDS FROM THE SPECIFIED TENSION. WHEN YOU ADJUST THE CABLES, ADJUST THEM TO |10 POUNDS OF THE SPECIFIED TENSION.
Rudder Cable Adjustment Figure 503
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
RUDDER TRIM
RUDDER TRIM 10 5 0 5 10
INDICATOR
NOSE LEFT UNITS NOSE RIGHT
AILERON
NOSE NOSE
LEFT R RIGHT
LEFT RIGHT U
WING DOWN WING DOWN D D E
R
RUDDER TRIM CONTROLS RUDDER TRIM CONTROLS
RUDDER
A
SEE A TRIM KNOB
FLIGHT COMPARTMENT
TOP
ADJUSTABLE SEE B
STOP
OUTPUT CRANK TO UPPER RUDDER
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