27-11-00
ALL ú ú 01 Page 17 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
C. If trim is adjusted with both aileron power control units depressurized, the drag of the unpowered aileron system will allow the system to remain out of center. This will force the trim and centering mechanism cam follower out of the cam detent. Then, when hydraulic power is applied, the control wheels and ailerons will rapidly move to the newly trimmed position.
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27-11-00
ALL ú ú 01 Page 18 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
AILERON AND AILERON TRIM CONTROL SYSTEM - TROUBLE SHOOTING
__________________________________________________________
1. General_______
A. Forces at the control wheels are generated by two areas in the aileron control system during operation with hydraulic power on:
(1)
Left Side - From the control wheels, through the left body cables AA and AB and the artificial feel centering and trim mechanism, to the two power control unit main control valves. In a control system within rigging tolerance, all control wheel forces are generated by the left side.
(2)
Right Side - From the two power control unit actuators, through the spring cartridge and the right body cables AA and AB, to the transfer mechanism lost motion device. A control system out of tolerance on the "right side" will transmit friction to the control wheels if one of the following two conditions exists:
(a)
The lost motion device out of adjustment and bottoming out.
(b)
Abnormal friction in transfer mechanism lost motion device spoiler control drum bearings.
B.
It is possible to have a defective or misadjusted aileron PCU and still have both ailerons operate within rigging tolerance. If a defective or misadjusted PCU is suspected, do a test of the power control units (AMM 27-11-00/501).
C.
Use a torque wrench and its adapter to measure the control wheel force (or torque) (AMM 27-11-00/501).
D.
Ensure that aileron cable rig loads are correct.
E.
Ensure that all rig pins can be freely inserted. Note that rig pin A/S-1 is inserted through three parts in the aileron transfer mechanism. Improper lost motion device rigging usually is the cause for excessive wheel forces in one direction only, espacially noticeable in flight.
F.
AIRPLANES WITH AN AILERON FORCE LIMITER; Remove the aileron force limiter. The force limiter shaft torque should be 0.5 pound-inch maximum.
G.
Check that the roll force transducer wires do not bind on captain's control column.
H.
Unhook or lift the two centering springs at the trim and feel mechanism to remove centering force. Tie back the roller arm to clear the cam. Wheel torque should be less than 13 pound-inches (2.0 pounds) at breakout, and approximately 26 pound-inches (4.0 pounds) at 75 degrees rotation.
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27-11-00
ALL ú ú 02 Page 101 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
I. Check the aileron spring cartridge by rotating the control wheel full travel with hydraulic power on. If the cartridge can be felt or observed to change in length the source of excessive friction is the flight spoiler control system or in the right side. For trouble shooting the flight spoiler system, refer to AMM 27-61-00/101. For trouble shooting the right side, see below.
J. Disconnect the spoiler ratio changer input rod and the right end of the aileron spring cartridge in the right wheel well to isolate the spoiler system.
K. With hydraulic power on, rotate control wheel approximately 12 degrees in each direction and check for movement of the right aft quadrant. Any movement of the right aft quadrant indicates high friction in the transfer mechanism bearings.
L. Rotate the right aft quadrant and check for binding. Ensure that the control wheel does not rotate (accomplish test within 12 degrees control wheel travel).
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