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 H.  Each FCC is hardwired to one of the lateral control servos, and so provides for three independant and redundant control channels. The FCCs generate three analog outputs that completely control the servos. The two analog discretes AIL HYD ARM and AIL HYD DETENT ENG, and the analog signal AIL SERVO CMD. The FCC also generates two output excitations for the two linear variable differential transformers (LVDTs) on the servo. The FCC recieves LVDT feedback from the servo to determine servo and surface position.
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A
747-400 MAINTENANCE MANUAL
AFCS MODE
CONTROL PANEL(P10)

FLIGHT CONTROL COMPUTER (FCC)
B AP/FD Roll and Yaw Axis Control - Component Location Figure 1 (Sheet 1)
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A
747-400
MAINTENANCE MANUAL

CENTRAL LATERAL CONTROL PACKAGE AND LATERAL AUTOPILOT SERVO INSTALLATION
SEE C
SPOILER DIFFERENTIAL MECHANISMS
CENTRAL LATERAL CONTROL PACKAGE (CLCP)-R
MANUAL INPUT CENTRAL LATERAL CONTROL
FROM CONTROL PACKAGE (CLCP)-L
WHEEL
AILERON TRIM AND FEEL MECHANISM
MANUAL INPUT 
FROM CONTROL 
LATERAL AUTOPILOT SERVO  WHEEL 
(LAS) 

AILERON PROGRAMMERS
CENTRAL LATERAL CONTROL PACKAGE AND LATERAL
AUTOPILOT SERVO INSTALLATION

C

AP/FD Roll and Yaw Axis Control - Component Location
Figure 1 (Sheet 2)

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A

747-400
MAINTENANCE MANUAL

(RPCP) INSTALLATION ROLLOUT POWER CONTROL PACKAGE DSEE 
BELLCRANK FEEL AND CENTERING UNIT 
CENTERING UNIT FEEL AND ASSEMBLY 
ASSEMBLY CLEVIS/TUBE 
OVERRIDE MECHANISM CAM 
HYDRAULIC FITTING 
ELECTRICAL CONNECTOR 
HYDRAULIC FITTING 
CONTROL PACKAGE ROLLOUT POWER (3 LOCATIONS)  ASSEMBLY CONTROL ROD FWD 
RPCP MOUNTING BOLTS AND WASHER (4 LOCATIONS) 
D (RPCP) INSTALLATION ROLLOUT POWER CONTROL PACKAGE 

AP/FD Roll and Yaw Axis Control - Component Location
Figure 1 (Sheet 3)

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D20627
A
747-400
MAINTENANCE MANUAL

COMMAND
ELECTRICAL AUTOPILOT COMMANDS PROCESSING
OR MANUAL INPUT FROM CONTROL WHEEL PRODUCE HYDRAULICALLY
DIGITAL

ACTUATED, MECHANICAL OUTPUTS ANALOG

MECHANICAL SYNCHRONIZATION TO AILERON AND SPOILER

PROGRAMERS
PRE-ENGAGE TEST
IDENTICAL AND INTERCHANGEABLE WITH CLCP-RIGHT AUTOPILOT
CENTRAL LATERAL CONTROL PKG-LEFT AUTOPILOT (FWD BLKHD RH WING GEAR WELL) FCC-L (E1-1)
ELECTRICAL AUTOPILOT
COMMANDS PRODUCE
HYDRAULICALLY ACTUATED
MECHANICAL OUTPUTS

FUNCTIONALLY TO AILERON TRIM ANDIDENTICAL TO FEEL MECHANISM

FCC-L
ENGAGEMENT

AUTOPILOT NO MANUAL CONTROLMODE WHEEL INPUTSELECTION

LATERAL AUTOPILOT SERVO
(FWD BLKHD LH WING GEAR WELL)

FCC-C (E1-3)
MCP (P10) CENTRAL LATERAL CONTROL PKG-RIGHT AUTOPILOT (FWD BLKHD LH WING GEAR WELL)

FCC-R (E1-4)
Roll Component Functional Interface
Figure 2 (Sheet 1)

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