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A
757
MAINTENANCE MANUAL
2. Component Details
_________________
A. Control Column (Fig. 4)
(1)
Two control columns are rigidly mounted on concentric torque tubes beneath the cabin floor. The torque tubes are slaved together through a cam override. Crank assemblies on each end of the torque tube transmit motion aft by control rods to forward quadrants/tension regulators. The control columns transmit pilot commands to control the airplane about the pitch axis. Forward and aft motion of the control columns actuates the elevators. Movement of the elevators controls the airplane about the pitch axis. Access to the torque tube and control columns is through the forward compartment access door.
B.
Forward Quadrant/Tension Regulators
(1)
Two forward quadrants are located beneath the cabin floor just aft of the control column torque tube. A control rod connects each quadrant to a crank assembly installed to the outboard end of each torque tube. The forward quadrants are connected to the aft quadrants by separate pairs of cables.
(2)
A tension regulator is installed in the captain's forward quadrant to maintain correct cable tension during temperature variation and structural deflections. A scale on the bottom of the tension regulator is used to adjust for correct cable tension.
C.
Elevator Control Aft Quadrants (Fig. 5)
(1)
Dual aft quadrants are located just aft of the horizontal stabilizer. The aft quadrants receive control cable inputs from the forward quadrants. The aft quadrants transmit feel and centering forces to the cable system and elevator control inputs to the power control actuators. The aft quadrants are equipped with a cam override to allow operation of one elevator should the other jam.
D.
Elevator Control Aft Mechanism Torque Box (Fig. 5)
(1)
The aft mechanism torque box is located just behind the aft quadrants. It supports the aft quadrants, feel unit, autopilot servos, and neutral shift mechanism.
(2)
The torque box is attached to airplane structure at six points. Three attach points, with spherical bearings, comprise the primary load path. The other three attach points comprise the secondary load path. A gap between the bolt and structure at the secondary load path attach points prevents airframe deflection from loading the torque box. This gap is not adjustable.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
TURNBUCKLE
(EXAMPLE)
E1B
E1A CONTROL COLUMN
SEE A
E2B FWD
D
E2A
D
RIG PIN E/ST6 HOLE
B
CAPTAIN'S
FIRST OFFICER'S CONTROL COLUMN
CONTROL COLUMN
TORQUE TUBES
A B
SEE B
A
B CONTROL COLUMNS
A
CONTROL COLUMN
C C
CONTROL RODFWD
RIG PIN E/ST6
FORWARD QUADRANT/ TENSION REGULATOR A-A
Elevator Forward Compartment Components
Figure 4 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
TENSION REGULATOR SCALE
Figure 4 (Sheet 2)
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