(a)  
Make sure the captain's and the first officer's control wheels are at the neutral (zero trim) position.

 (b)  
At the same time, operate the two aileron trim switches in the LEFT WING DOWN direction until the trim actuator stops.

 NOTE: Make sure trim actuator operates correctly (stops when
____ commanded and does not run-on). Two persons communicate during run-on check of trim actuator. One person in the wheel well instructs the person in the flight deck to apply trim input and when to stop. If the actuator does not stop when commanded, replace the actuator.
 1)  Measure the movement of the captain's and the first officer's control wheels from the neutral (zero trim) position.
 2)  If the aileron control wheels are not in the new neutral position, move them to the new neutral position .
 NOTE: Control wheel neutral position for maintenance
____ purpose is determined by turning the control wheel left and right in decreasing amounts until the neutral position can be determined by feel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 3)  Make sure the control wheels turn counterclockwise 60 |3 degrees (10 |1/2 trim indicator units) from the neutral position in 24 |1 seconds.
 NOTE: If it is necessary, apply a light finger pressure to
____ the control wheel while trimming the aileron to achieve the required 10 units deflection of control wheel. The light manual help for the control wheel to turn is to overcome possible friction in the input side of the control system which can be slightly greater than the force of the centering springs to hold the centering roller into the cam detent.
 (c) With the full LEFT WING DOWN trim input, do a check of the control wheel movement: 1) Manually turn the captain's control wheel counterclockwise to 105 degrees. 2) Turn the captain's control wheel back to the neutral position. 3) Turn the captain's control wheel clockwise to 75 degrees. a) Make sure the captain's control wheel can move freely.
 4)  Measure the force necessary to hold the captain's control wheel at the 75 degrees position. a) Make sure that the force is not more than 21 pounds at
 6.5 inches radius or 137 pound-inches torque. 5) Release the captain's control wheel.
 a)  Make sure that the control wheel goes back to 60 |3 degrees (10 |1/2 trim indicator units) counterclockwise.
 NOTE: If it is necessary, apply a light finger
____ pressure to the control wheel while trimming the aileron to achieve the required 10 units deflection of control wheel. The light manual help for the control wheel to turn is to overcome possible friction in the input side of the control system which can be slightly greater than the force of the centering springs to hold the centering roller into the cam detent.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 27-11-00
 ALL  ú ú 02 Page 531 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (d)  At the same time, operate the two aileron trim switches in the RIGHT WING DOWN direction until the trim actuator stops.
 NOTE: Make sure trim actuator operates correctly (stops when
____ commanded and does not run-on). Two persons communicate during run-on check of trim actuator. One person in the wheel well instructs the person in the flight deck to apply trim input and when to stop. If the actuator does not stop when commanded, replace the actuator.
 1)  Measure the movement of the captain's and the first officer's control wheels from the neutral (zero trim) position.
 2)  If the aileron control wheels are not in the neutral position, move them to the neutral position .
 NOTE: Control wheel neutral position for maintenance
____ purpose is determined by turning the control wheel left and right in decreasing amounts until the neutral position can be determined by feel.
 3)  Make sure the control wheels turn clockwise 60 |3 degrees (10 |1/2 trim indicator units) from the neutral position in 24 |1 seconds.
　
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