(g)  
Do the same check on the opposite aileron.

 S 226-028
 (3)  
Do a check of the play of one aileron balance tab with no movement of the aileron:

 (a)  
Make sure the control wheel is centered.

 CAUTION: BE VERY CAREFUL WHEN YOU INSTALL THE MOUNTING DEVICE.
_______ SPECIALLY WITH AN AILERON MADE OF COMPOSITE MATERIALS. THE MOUNTING DEVICE CAN CAUSE DAMAGE TO THE AILERON IF YOU ARE NOT CAREFUL.
 (b)  Attach a mounting device to the aileron trailing edge and do these steps: 1) Attach the dial indicator to the aileron.
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737-300/400/500MAINTENANCE MANUAL
 2) Center the plunger of the dial indicator within 0.1 and forward of the tab trailing edge. 3) Adjust the dial indicator to zero.
 CAUTION: USE SUFFICIENT PADDING ON THE FORCE SCALE TO PREVENT
_______
 DAMAGE TO THE CONTROL SURFACE.

 (c)  Use a force scale and apply force within 0.25 inch of the tab trailing edge and directly opposite to the tab control rods. 1) Push up with a force of approximately 5 pounds. 2) Make a record of the travel shown on the dial indicator. 3) Push down with a force of approximately 5 pounds.
 NOTE: Do not adjust the dial indicator.
____
 4) Make a record of the travel shown on the dial indicator. 5) Slowly remove the force.
 (d)  
Make sure the total up-and-down freeplay of the aileron balance tab is not more than 0.063 inch.

 (e)  
Remove the dial indicator.

 (f)  
Remove the mounting device.

 (g)  
Do these steps to make sure the axial play (inboard-outboard direction) of the tab is not more than 0.040 inch. 1) Hold the aileron tab around the trailing edge and move it

 outboard using hand pressure.
 2)  Use a feeler gage to measure the clearance between the aileron and the outboard end of the aileron tab and make a record of this clearance.
 NOTE: It may be necessary to insert a flat metal filler
____ block between the aileron and the aileron tab to help in this measurement. The nominal clearance between the aileron and the aileron tab is 0.20 to
 0.30 inch.
 3) Hold the aileron tab around the trailing edge and move it inboard using hand pressure. 4) Measure the clearance between the aileron and the outboard end of the aileron tab.
 NOTE: The axial play is the difference in clearance
____ measurements recorded in this step and the clearance recorded before.
 (h)
Do the same check on the tab of the opposite aileron.

 F.  
Put the Airplane Back to Its Usual Condition

 S 866-026
 (1)  Release the pressure from the aileron hydraulic system
 (AMM 27-11-00/201).

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A 737-300/400/500MAINTENANCE MANUAL
 TASK 27-09-91-206-003
 3. Rudder Inspection
_________________
 A. General
 (1)  
The control surface movement in the specified limits is permitted if the worn areas are equal in all the mechanical parts of the system. If a local area wears more quickly than the other areas in the system, repair that part of the system.

 (a)  
The limits are provided in Fig. 601.

 (2)  
Measure the movement with the control surface in the approximate aligned position at the surface inboard trailing edge.

 B.
Standard Tools and Equipment

 (1)  
Dial Indicator - 0.001 inch accuracy (Commercially available)

 (2)  
Push/Pull Scale - 0 to 25 lb capacity, 1/4 lb accuracy (commercially available)

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

 (4)  
Loading Block, 1/8 inch thick, 3 inches by 3 inches wood or fiberglass block with pad to prevent damage to the skin (commercially available)