C

Rudder Power Control Module
Figure 11 (Sheet 2)

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MAINTENANCE MANUAL

SYSTEM 1  SYSTEM 2  SYSTEM 3  SYSTEM 4 
NO. 1  NO. 2  NO. 3  NO. 4 
ENGINE-DRIVEN  ENGINE-DRIVEN  ENGINE-DRIVEN  ENGINE-DRIVEN 
PUMP  PUMP  PUMP  PUMP 
(EDP)  (EDP)  (EDP)  (EDP) 

RIGHT
CENTRAL
LATERAL
CONTROL
PACKAGE
(IN LEFT
WHEEL WELL)

CENTER
RIGHT
ROLLOUT ROLLOUT
POWER POWER
CONTROL CONTROL
PACKAGE PACKAGE

(RPCP) (RPCP)

UPPER
RUDDER
POWER
CONTROL
MODULE

(RPCM)

LEFT
ROLLOUT
POWER
CONTROL
PACKAGE

(RPCP)

AC MOTOR-DRIVEN PUMP (ACMP) AC MOTOR-DRIVEN PUMP (ACMP) AUX AC MOTOR-DRIVENPUMP (ACMP)
LEFT
CENTRAL
LATERAL
CONTROL
PACKAGE
(IN RIGHT
WHEEL WELL)

LOWER
RUDDER
POWER
CONTROL
MODULE

(RPCM)

LEFT STABILIZER TRIM CONTROL MODULE (STCM)

CENTER
ELEVATOR
A/P
SERVO

(EAS)

RIGHT
ELEVATOR
A/P
SERVO

(EAS)

LEFT
ELEVATOR
A/P
SERVO

(EAS)

Autoflight Hydraulic and Flight Controls Block Diagram
Figure 12

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ENG. NO. 1 ENG. NO. 2 ENG. NO. 3 ENG. NO. 4
BLEED AIR BLEED AIR BLEED AIR BLEED AIR

A/P SERVO HYD POWER SYSTEM NO. 1EDP ENGINE-DRIVEN PUMP
HYD POWER SYSTEM NO. 2
HYD POWER SYSTEM NO. 3

AIR-DRIVIN PUMP
HYD POWER SYSTEM NO. 4
AC MOTOR-DRIVEN PUMP

FLUID SUPPLY
RESERVOIR
PNEUMATIC PRESSURE

Autoflight Hydraulic and Flight Controls Interface Schematic
Figure 13

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747-400
MAINTENANCE MANUAL

CONTROL

AILERON
Aileron Control System
Figure 14

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OUTBOARD ELEVATOR 
INBOARD ELEVATOR 
SLAVE LINKAGE  ELEVATOR AUTOPILOT SERVO (EAS) 
ELEVATOR POSITION TRANSMITTER  FEEL UNIT 
CONTROL COLUMNS  AFT TORQUE TUBE INBOARD ELEVATOR POWER CONTROL PACKAGE (2)  OUTBOARD ELEVATOR POWER CONTROL PACKAGE (2)

Elevator Control System
Figure 15

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 (c)  
The inboard elevator power control packages receive the manual input from the aft quadrant. Movement of the inboard elevators provides the input to the outboard elevator power control packages through the slave linkages, which then move the elevators.
　
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