(c)  
Make sure that the rudder trim indicator is at the zero unit.

 (d)  
Adjust the input rod of the feel and centering unit until the system is at the center.

 (e)  
Install the rig pin R-5 in the output crank of the feel and centering unit. 1) Make sure you can install the rig pin easily without

 movement of the output crank.
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A 737-300/400/500MAINTENANCE MANUAL

RUDDER
A-A
Rudder Travel and Index Plate Figure 505
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A
737-300/400/500MAINTENANCE MANUAL
 (f)  
Remove the rudder hydraulic power systems A and B (Ref 27-21-00/201).

 (g)  
If the index mark does not align with the mark at the center for more than 0.02 inch, Adjust the control rod: 1) Loosen the two checknuts on the rod assembly. 2) Remove the bolt that attaches the aft end of the control

 rod to the actuator.
 3)  In the same direction, turn the tub and the rod end until the index mark aligns with the mark at the center to less than 0.02 inch.
 NOTE: One-half turn of one rod end is same as 0.015 inch
____ approximately at the index mark.
 4) Install the clevis bolt at the rod end. 5) Set the FLT CONTROL A and B switches to ON.
 (h)  If the index mark does not align with the mark at the center for less than 0.02 inch, Adjust the control rod: 1) Loosen the two checknuts on the rod assembly, and then turn
 them approximately two turns. 2) Turn the tube until the index marks align with the mark at the center.
 NOTE: One full turn at the tube moves the index mark
____ approximately 0.006 inch.
 3)  Tighten the two checknuts.
 (i)  
Make sure you see the rod end threads through the inspection holes at the two ends of the tub.

 (j)  
Remove the rig pin R-5.

 (k)  
Do a test of the rudder and the rudder trim control system.

 TASK 27-21-00-705-024
 3.  Rudder and Rudder Trim Control System Test
__________________________________________
 A.  Special Tools and Equipment
 (1)  F80212 - Checking Tool - Rudder Pedal Force
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.

C.
D.
E.
A
737-300/400/500MAINTENANCE MANUAL
Standard Tools and Equipment
 (1)  
Loading Block - 1/8 inch thick, 3 inch x 3 inch wood or fiberglass block with pad to prevent the skin damage.

 (2)  
Dial Indicator (optional) - Accurate to 0.001 inch

 (3)  
Mounting Device (optional) - to hold the dial indicator

 (4)  
Scale - 0-2 feet, in inches, tenths and hundredths of an inch increments

 (5)  
Scale - Push/Pull, 0-25 lb capacity, 1/4 lb accuracy (commercially

 available)References

 (1)  
27-09-91/601, Flight Control Surfaces

 (2)
27-21-00/201, Rudder and Rudder Trim Control SystemAccess

 (1)  
Location Zones 101 Control Cabin, LH 102 Control Cabin, RH 708 Rudder

Procedure
 S 735-026
 (1)  
Do a test of the rudder pedal adjustment and the rudder pedal limit travel:

 (a)  
Supply the rudder hydraulic power systems A and B
 (Ref 27-21-00/201).

 (b)  
　
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