Lateral Control System Schematic
Figure 2
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A 737-300/400/500MAINTENANCE MANUAL
AILERON PCU INPUT TORQUE TUBE
Aileron Trim Control System Schematic
Figure 3
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3.
4.
5.
A
737-300/400/500MAINTENANCE MANUAL
D. In No. 1, 2, and 4 bays, the aileron leading edge extension does not have a balance panel, but has a polyamide nylon seal mounted upon the nose extension coming into contact with a seal baffle. The seals along with a similar seal on the balance panel, control the airflow around the front of the aileron. A clearance between the aileron leading edge and the wing structure provides the controlled airflow area necessary for balance panel operation.
Aileron Balance Tab
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A. The aileron balance tab functions to reduce the force required to position the aileron. Motion of the tab is controlled by dual tab pushrods which provide attachment between tab and wing strucuture (Fig. 8). Balance tab travel is opposite to aileron travel, that is, a downward movement of the aileron produces an upward movement of the balance tab.
B. The aileron balance tab is a thin tapered light weight control surface attached to the aileron rear spar by four hinge bearings. The balance tab is of graphite/epoxy construction with a nomex honeycomb core. Left and right balance tabs are identical except for mounting of the mast fittings and related fairing.
C. The aileron balance tab may be replaced without rebalancing the aileron. Each tab is furnished with adjust weights that bolt to the balance panel. The required number of adjust weights is stamped on a data plate attached to each balance tab.
Aileron Balance Panels and Seals
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A. Aileron balance panels reduce the force required to position the ailerons in flight. Each aileron has one balance panel located at No. 3 bay. The balance panel is connected to the aileron leading edge by a continuous hinge at the aft edge. The forward edge of each balance panel is attached to the wing structure by an idler hinge which provides the necessary articulation of movement of the balance panel (Fig. 4). Seals are installed along the inboard and outboard edges of the balance panel.
B. Balance panels may be replaced without altering the control surface balance. The aileron balance tab adjust weights fasten to the lower aft edge of the aileron balance panel.
Aileron Trim Control System
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A. Aileron Trim Switches: The aileron trim switches are located on the aft electronic control panel (P8). The trim switches must be operated simultaneously to provide elctrical input to the trim actuator (Fig. 3 and 5).
B. Aileron Trim Actuator: The aileron trim actuator connected to the feel and centering mechanism receives electrical signals from the trim switches. The trim actuator extends or retracts, repositioning the feel and centering mechanism null detent.
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