WING CABLE A1A (LEFT) WING CABLE A2A (RIGHT)
RIG PIN
HOLE A-3 (LEFT) WING CABLE A1B (LEFT) A-4 (RIGHT)
WING CABLE A2B (RIGHT)
AILERON QUADRANT AND OVERRIDE MECHANISM
B
Aileron Quadrant and Override Mechanism
Figure 5
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A 757 MAINTENANCE MANUAL
SEE A
PCA INPUT LEVER
PCA INPUT ROD
AILERON
HYDRAULIC (PCA FITTING)
PRESSURE
SEE A LINE PCA
INPUT
ROD PCA
INPUT
FILTER LEVER
HYDRAULIC PRESSURE LINE
FWD INBD
PCA (OUTBOARD) SEE B
PCA FILTER (INBOARD)
AILERON PCA INPUT (ROD END FAIRING) SEE B LEVER
HYDRAULIC
RETURN LINE AILERON PCA (LEFT SIDE SHOWN, RIGHT SIDE EQUIVALENT)
LEFT SIDE
PCA INPUT HYDRAULIC
A
ROD TUBING SUPPORT BRACKET
FILTER
HYDRAULIC PRESSURE LINE
PCA
TRUNNION SUPPORT
LEFT AILERON INBOARD PCA
B
Power Control Actuators Figure 6
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
SEE A
HINGE SEE AILERON A
SEE HINGE B HINGE STATIC DISCHARGERS
HINGE
A HINGE
B PCA FITTING Aileron Panel Figure 7
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A
757
MAINTENANCE MANUAL
3. Operation
_________
A. Functional Description (Fig. 8, 9, 10)
______________________
(1) Manual Operation
________________
(a)
Control wheel rotation provides the initial manual command inputs to the lateral control system. Control cables relay commands to lateral control mechanisms in the left and right main gear wheel wells.
(b)
The feel, centering, and trim mechanism and the lateral control override mechanism receive cable command inputs from the control wheel. Linked by a control rod, the mechanisms act together through control cables commanding left and right ailerons equally, but in opposite directions.
(c)
The aileron quadrant receives cable commands from the left or right wheel well mechanisms. As the quadrant rotates, it moves mechanical linkage to the PCAs. This causes the PCA servo valve to port hydraulic power to the actuators. Under hydraulic pressure, the actuator extends or retracts and the aileron is raised or lowered as required.
(2)
Abnormal Operation
__________________
(a)
Each aileron component has a breakout or override so that the aileron system will remain operable should it or a downstream component become jammed.
(b)
The captain's and first officer's control wheels are joined by a bus force limiter rod. Should either control wheel become inoperable, the force limiter's two-way spring allows the other wheel to operate the remaining aileron system independently.
(c)
The feel, centering, and trim mechanism and the lateral control override mechanism each have an override or shear joint to allow continued operation of one should the other become jammed.
(d)
The wing aileron override mechanism can allow break out of a PCA jam or an aileron quadrant jam. These overrides ensure continued use of the remaining aileron.
(3)
Autopilot Operation
___________________
(a) The autopilot lateral control servos (ALCS's) receive commands directly from the autopilot system. The ALCS's are linked directly to the wheel well mechanisms by cranks. Autopilot commands cause the cranks to move which drive the wheel well mechanisms. Actual aileron control remains the same as with manual operation.
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