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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
5. Control Columns (Fig. 3)
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A. The two control columns provide primary control of the airplane about the pitch and roll axes. Forward and aft motion of either control column actuates the elevators to provide control of the airplane about the lateral axis. Rotating a control wheel on either column operates the ailerons and spoilers to provide control about the longitudinal axis.
B. The control columns are mounted at each end of the quadrant torque tube. Motion is transmitted from the column to the torque tube through mating face splines. Inside each column outer housing, the lower end of a shaft is connected to the aileron and spoiler control systems through a spade universal. A bevel gear, located at the upper end of this shaft, is driven by a mating bevel gear connected to the control wheel. The control column wiring harness originates at a terminal block in the lower nose section and is routed up through a conduit inside the control column outer housing. At the top of the column, the wire bundle is wrapped loosely four times around the hub of the control wheel bevel gear and then routed inside the control wheel. The wires for the stabilizer trim control switch, autopilot disengage switch, and microphone switch are routed to the outboard horn of the control wheel. At the outboard horn, the wires are then connected to the appropriate switches. The wires for the stabilizer trim control switch are first routed to a terminal block in the control wheel spoke and then to the control switch. A memory device consisting of three rotatable digital readout discs, is incorporated in the inboard horn of the control wheel. The wires for the memory device light are routed through the inboard horn of the control wheel. A stall warning shaker is mounted on the forward face of the captain's and first officer's control columns. Wiring provisions for the stall warning shaker are also included in the control column. Felt dust seals are fastened to the control cabin floor. A spherical dust cover fastened to the column, contacts these seals to restrict airflow around the base of the control column.
6. Elevator Forward Control Quadrants
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A. The elevator forward control quadrants are aluminum alloy forgings, suspended from the quadrant torque tube and located in the lower nose section (Fig. 3). The elevator control cables are located in grooves along the lower surface of each forward control quadrant. Each cable is secured at the quadrant. A pitch transducer is installed in each forward control quadrant. For more detailed information, refer to Chapter 22, Auto Flight. Access to the forward control quadrants is through the forward access door at station 211, just forward of the nose wheel well door.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
MICROPHONE SWITCH
MEMORY
DEVICE AUTOPILOT
CONTROL DISENGAGE
WHEEL SWITCH
STABILIZER TRIM
CONTROL SWITCH
CAPTAIN'S
CONTROL STALL WARNING
COLUMN CONTROL COLUMN FIRST OFFICER'S
SHAKER CONTROL COLUMN
WIRE
HARNESS
CABIN FLOOR
DUST COVER STALL WARNING
CONTROL COLUMN
SHAKER
QUADRANT
TORQUE TUBE
ELEVATOR FORWARD
CONTROL QUADRANT
CONTROL CABLE EA
WEIGHT BLOCKS
CONTROL CABLE EB
AUTOPILOT
PITCH
TRANSDUCER
Control Columns (Typical)
Figure 3
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
7. Elevator Aft Control Quadrants
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A. The elevator aft control quadrants are four individual segments mounted on the input torque tube in the empennage (Fig. 1). The two upper segments are connected to the elevator up cables (EB) and the lower segments to the elevator down cables (EA). Aft movement of the control column will displace the elevator up cables (EB) forward, and forward movement of the control column will displace the elevator down cables (EA) forward.
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