W28872 W29856 W28918
500  Rudder Forward Quadrant Adjustment 
May 01/03  Figure 503  27-21-1 
Page 509 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Rudder Aft Control Mechanism Adjustment  500 
27-21-1  Figure 504 (Sheet 1)  May 01/03 
Page 510 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

500  Rudder Aft Control Mechanism Adjustment 
May 01/03  Figure 504 (Sheet 2)  27-21-1 
Page 511 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(6)  Adjust rudder trim control cables RTA and RTB.
(a)  
Check that rudder hydraulic systems A, B, and standby are removed (step 1.C(1)).

(b)  
Disconnect feel and centering unit input rod from torque tube crank. Move rod to one side and secure (Fig.504).

(c)  
Set indicating arrow on rudder trim knob at zero units of trim and hold in that position, with forward cable drum in neutral position per step (5).

(d)  
If new cables are installed:

1)  Tighten RTA and RTB cables to 100 ±10 pounds tension to prestretch cables using turnbuckles located in stabilizer jackscrew compartment. Tighten turnbuckles on each cable an equal amount. If turnbuckle travel is inadequate for complete adjustment, further adjustment is possible by using turnbuckles located in ceiling of forward cargo compartment at fuselage station 451.
2)  (Applicable to new cable installations only. Check that rigging pin R-5 can be installed freely without binding. If adjustment is required, adjust RTA and RTB turnbuckles in opposite direction, maintaining cable tension specified in step (d), until rigging pin can be installed freely.
3)  Cycle the system 10 times through full travel. Then reduce cable tension to load specified in table 2, Fig. 501 by adjusting turnbuckles on RTA and RTB cables an equal amount.
(e)  
Operate rudder trim knob through one full travel cycle and check cable tension per table 2, Fig. 501. If necessary, readjust cable tension and repeat.

(f)  
Set indicating arrow on rudder trim knob at zero units of trim and hold in that position.

(g)  
Check that rigging pin R-5 can be installed freely without binding. If correction is required adjust RTA and RTB turnbuckles in opposite direction, maintaining cable tension specified, until rigging pin can be installed freely. Also check that cotter pin hole on trim actuator is in center of paint mark on actuator drum.

(h)  
Remove rigging pin R-5.

(i)  
Adjust pressure seal at aft pressure bulkhead to align with RTA and RTB cables. Adjust by loosening seal retainer bolts and position seal properly (AMM 27-09-121 and 20-10-101).

(j)  
Install turnbuckle locking clips, and apply a thin coating of corrosive preventive material to exposed threads.

(k)  
Connect input rod between feel and centering unit and torque tube. Install bolts, washer, and nuts. Tighten nut on outer bolt to 50-60 pound-inches, then tighten nut on inner bolt to 12-15 pound-inches.

CAUTION:  AFTER TIGHTENING NUT ON INNER BOLT, DO NOT RESET TORQUE FOR NUT ON OUTER BOLT. NUT ON INNER BOLT MAY BECOME LOOSE.
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 May 01/03 

(7)  Adjust rudder control cables RA and RB.
(a)  
Check that hydraulic systems A, B, and standby power are removed (step 1.C(1)).

(b)  
Check that rudder trim knob is set at zero units of trim and cycle rudder pedals per par. 2.C. to check for full pedal travel.

(c)  
When installing new forward quadrant busrod, shorten busrod by turning rod end two full turns. Connect busrod by installing bolt with spacers, washers, nut, and cotter pin.

(d)  
If new cables are installed:

1)  Attach RA and RB cables to forward quadrants, then attach cables to aft quadrant and install rigging pin R-5 in feel and centering unit output crank.
2)  Adjust turnbuckles on RA and RB cables to 260 ±20 pounds cable tension to prestretch cables.  Keep adjustment on both sides of cables equal by checking that rigging pin R-3 can be inserted in captain's forward quadrant.
　
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