737-300/400/500
MAINTENANCE MANUAL

BALANCE PANEL
HINGE

VENT GAP
AILERON HINGE POINT
BALANCE PANEL

BALANCE TAB VENT GAP AILERON

Aileron Balance Panel
Figure 4

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A 737-300/400/500MAINTENANCE MANUAL
AILERON TRIM SWITCHES

Aileron Trim Switches
Figure 5

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A 737-300/400/500MAINTENANCE MANUAL
 6.  Aileron Artifical Feel, Centering and Trim Mechanism
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 A.  The aileron artificial feel, centering and trim mechanism provides aileron control system centering, trim, and artificial feel. The aileron centering mechanism consists of a cam, roller arm support, and two springs (Fig. 1). The centering cam is bolted to the control quadrant shaft. The roller is mounted on the roller arm and the roller arm is mounted on the support. Two springs are attached between the roller arm and the support to provide the force necessary to hold the roller against the cam; thus providing aileron control system centering and artificial feel.
 7.  Aileron Transfer Mechanism
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 A.  A transfer mechanism is located in the base of the first officer's column. The mechanism incorporates both the transfer mechanism and the lost motion device. The transfer device consists of a preloaded torsion spring whose ends are held against two identical halves of a spring container (Fig. 7). The two halves of the spring container are locked to preload the spring.
 B.  The aileron control bus drum is attached to the upper half of the spring container and the spoiler control drum is attached to the lower half of the spring container. In normal operation, motion is transmitted between the two drums through the preloaded torsion spring. If a malfunction occurs, jamming either the aileron or the spoiler control system, the other system can be operated independently. In this case, the captain or the first officer, depending on the jammed system, will have to exert a maximum force of 117 pounds to overcome the spring preload in the transfer mechanism and operate the other system to maintain lateral control of the airplane. In case the aileron cables are jammed, the first officer will have to exert a force to overcome the spring preload in the transfer mechaism and operate the spoilers. When the first officer's control wheel starts turning, it will turn through 12 degrees before motion is picked up by the spoiler control drum through the lost motion device. The control drum then operates the spoilers through the right hand aileron control cables AA and AB (Fig. 2) to the spoiler mixer.
 C.  In case the spoiler cables are jammed, the captain will, similarly, have to exert a force to overcome the spring preload in the transfer mechanism and operate the ailerons.
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A 737-300/400/500MAINTENANCE MANUAL

Aileron Centering Spring and Trim Mechanism
Figure 6

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A

737-300/400/500
MAINTENANCE MANUAL

AILERON CONTROL BUS DRUM
SPOILERTORSION CONTROL DRUMSPRING
SPRING
　
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