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 G.  During normal flap operation, there is no separate indication on the flight deck of the position of the LE flaps. The expanded FLAPS display appears automatically on the main EICAS for non-normal configurations such as alternate flaps, flap asymmetry, and LE or TE flaps disagreement with flap control lever position. The expanded display has 6 leading edge symbols above the TE flap position tapes which indicate status of the inboard, midspan, and outboard groups of LE flaps on each wing. The leading edge symbol for LE flaps fully retracted is a white box outline. The leading edge symbol for LE flaps in transit is a white box outline filled with white diagonal cross-hatching. The leading edge symbol for LE flaps fully extended is a solid green box. Any of the three symbols appears in amber to indicate a failure with that group of LE flaps. For a complete description of LE flap indication refer to 27-88-00/001.
 2.  Flap Control Units (Fig. 2)
__________________
 A.  The three Flap Control Units (FCU's) provide control, protection, and indication for the TE and LE flaps. The FCU's also process position indication signals for the horizontal stabilizer (Ref 27-48-00/001). The FCU's are located in the main electrical/electronic equipment center, with the left FCU on the E1-2 shelf and the center and right FCU's on the E2-2 shelf. The FCU's are powered by the Flight Controls Electronics Power Supply Modules (Ref 27-09-00/001).
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A 747-400 MAINTENANCE MANUAL
SEE A
SEE B
P2-3 PILOTS' CENTER A INSTRUMENT PANEL 
FLAP CONTROL UNITS  FLAP UP 1 
SEE  C  FLAP LEVER  10 5 
A  20 
A  FLAP  25 
30 
A-A 
RVDT ASSEMBLY FLAP LEVER 

B
C
Leading Edge Flap System Component Location Figure 2 (Sheet 1)
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A
747-400
MAINTENANCE MANUAL

 

ROTARY ACTUATOR (TYP)
Leading Edge Flap System Component Location
Figure 2 (Sheet 2)

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A
747-400
MAINTENANCE MANUAL

OFFSET

Leading Edge Flap System Component Location
Figure 2 (Sheet 3)

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A
747-400
MAINTENANCE MANUAL

 B.  Each FCU receives inputs from the following sources:
 (1)  
Flap lever RVDT's

 (2)  
Thrust reverser relays.

 (3)  
ALTN FLAPS ARM switch and ALTN FLAPS EXT/RET switch

 (4)  
Primary and alternate air/ground relay system

 (5)  
Left and right Air Data Computers

 (6)  
Leading edge flap power drive units.

 (7)  
Trailing edge flaps RVDT's.

 (8)  
Central Maintenance Computer System

 C.  
The inputs are processed independently by each FCU to generate output signals to the flap actuator, flap alternate electric motors, flap position and failure indication displays, LE flap power drive units and other airplane user systems. All automatic flap control functions will operate with one, two, or three FCU's operational. If all three FCU's fail, the EICAS caution message FLAPS CONTROL is displayed.
　
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