(2)  
The aileron quadrant transmits control wheel or autopilot commands to the PCAs. The override mechanism provides a breakout to allow continued use of one aileron should the other become jammed.

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A

757
MAINTENANCE MANUAL

SEE C
SEE A
BODY BODY
CABLE
CABLE CONTROL LATERAL A1A
CONTROLA1B RODWING CABLE OVERRIDEA1A MECHANISM
WING CABLE A1B
SEE B
ALCS A
QUADRANT
AILERON TRIM
CENTERING

ACTUATOR
SPRINGS (2)

RIG PIN HOLE A1 ALCSCAM CRANK
ROLLER AUTOPILOT LATERAL CONTROL SERVO (ALCS)
FEEL, CENTERING, AND TRIM MECHANISM
B
Lateral Feel, Centering, and Trim Mechanism
Figure 3 (Sheet 1)

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A
757
MAINTENANCE MANUAL

 H. Power Control Actuators (PCAs) (Fig. 6)
______________________________
 (1)  
The PCAs are mounted side-by-side on the wing rear spar. Each PCA consists of an actuator with internal control and shuttle valves. The actuator rod end is attached to a bracket on the aileron. The summing levers connect each PCA with the aileron quadrant input crank. Reaction links provide the mechanical reaction path forces to raise and lower the ailerons.

 (2)  
Each PCA is powered by a separate hydraulic system. The left aileron outboard PCA receives pressure from the right hydraulic system; the right aileron outboard PCA receives pressure from the left hydraulic system. The left and right aileron inboard PCAs are powered by the center hydraulic system.

 I.
Aileron (Fig. 7)

_______
 (1)  The aileron is mounted on the wing trailing edge at five hinge points. The aileron has full 40° travel; 20 |1° deflection down, 20 |1° deflection up. The autopilot provides full aileron deflection. Aileron trim is limited to 11.6° down and 11.6° up. The aileron position transmitter is mounted on the aileron surface and wing rear spar (Ref 27-18-00, Description and Operation).
NOSE RIGHT
AILERON TRIM
FLIGHT COMPARTMENT

NOSE LEFT 15 10  505 RUDDER TRIM UNITS  NOSE RIGHT 1510 

Lateral Feel, Centering, and Trim Mechanism
Figure 3 (Sheet 2)

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757
MAINTENANCE MANUAL

SEE A
FWD
BODY ROD CONTROL
CABLE A2A
LATERAL FEEL,
CENTERING, AND
TRIM MECHANISM

ALCS
A
CONTROL ROD
(TO LATERAL FEEL,
CENTERING, AND
TRIM MECHANISM)

RIG PIN
HOLES A-2

CONTROL ROD TO ALCS
LATERAL CONTROL OVERRIDE MECHANISM
B
Lateral Control Override Mechanism Figure 4
BODY
CABLE
A2B

WING CABLE A2B
SEE B
WING CABLE A2A
OVERRIDE
SPRINGS (2)
OVERRIDE CAM
AUTOPILOT CRANK
INBD FWD
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 ú  02  Page 7
 ú  Dec 15/83 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

SEE A
CONTROL ROD
SEE  B 
PCA'S 
A 
OVERRIDE 
SPRING  OVERRIDE CAM 
　
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