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B.  The normal electrical trim control system consists of control switches, cutout switches, limit switches, trim control relays, a stabilizer trim on warning light and the electric actuator (Fig. 2). The electric actuator contains two electromagnetic clutches, an electric motor, and the output shaft to drive the jackscrew gearbox. The motor is operated by ac power and the electromagnetic clutches by dc power. The stabilizer actuator is controlled through the trim control relays by the control switches, the limit switches and the cutout switches. The stabilizer-trim-on warning light indicates that the trim motor is operating. The control switches are located on the outboard horn of each control wheel and have two momentary on positions, NOSEUP and NOSEDOWN, and are spring- returned to the center OFF position. Two stabilizer limit switches located on the bulkhead aft of the jackscrew gearbox are actuated by a striker to limit the UP and DOWN leading edge travel of the stabilizer. The cutout switches on the control stand, are used to remove power from the main electrical actuator or the autopilot actuator.
501 
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G10581G10587 G10623
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500  Horizontal Stabilizer Trim Control System Component Location 
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Horizontal Stabilizer Trim Control System Component Location  516 
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During use of the autopilot actuator trimming is done at one of two rates. The high speed winding of the autopilot servomotor provides trimming at l/3 of the rate of the normal electric actuator. The low speed winding of the autopilot servomotor provides trimming at 1/18 of the rate of the normal electric actuator. The actual autopilot trimming rate is controlled by the position of the flaps.
2.  Horizontal Stabilizer
A.  The horizontal stabilizer assembly consists of a left and a right section attached to a center section. (See figure 3.) The center section jackscrew support, hinge supports, front spar and rear spar members are all truss-type forgings. Good accessibility for maintenance is provided by the use of a star-shaped pattern of beams for the center section.
3.  Stabilizer Forward Control Mechanism
A.  The stabilizer forward control mechanism provides the means of manual control for the stabilizer in the event of electrical malfunction. The forward control mechanism extends from a stabilizer trim wheel on each side of the control stand to a forward trim mechanism in the lower nose compartment. (See figure 1.) The stabilizer trim wheels and a sprocket are splined to a control wheel shaft that extends through the control stand. Rotation of the stabilizer trim wheels transmits motion to a forward trim mechanism sprocket by a chain assembly. The forward trim mechanism sprocket drives the forward cable drum which is cable connected to the stabilizer jackscrew gearbox cable drum. The stabilizer jackscrew gearbox cable drum drives the jackscrew to position the stabilizer. The forward trim mechanism is attached to the lower nose compartment by support linkages which can be adjusted to align the trim mechanism and obtain proper chain and cable tension.
4.  Stabilizer Position Indicator
A.  A stabilizer position indicator provides continuous indication of stabilizer trim. (See figure 1.) The stabilizer position indicator operates through a flexible shaft connected to the forward trim mechanism, a jackshaft, and a linkage to the indicator. The flexible shaft transmits motion to the indicator linkage through the jackshaft and positions the indicator. During normal electrical operation the stabilizer trim cables drive the forward trim mechanism which operates the trim position indicator and rotates the trim wheels. A scale on the control stand is calibrated in units of trim to indicate the position of the stabilizer. A green area on the scale indicates the proper takeoff stabilizer range and is referred to as the GREEN RANGE.
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G25985G10621 G10672
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