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Trailing Edge Flap Position RVDT Transmitter
____________________________________________
 A.  The trailing edge flap position RVDT transmitters sense TE flap position. There is an RVDT transmitter mounted on the outboard transmission on each inboard and outboard flap, and an RVDT transmitter located in the inboard and in the outboard TE flap power drive unit. There is also an integral RVDT transmitter in the TE flap actuator.
 B.  The RVDT transmitters are preset to the zero (rigging) position when they
 are installed. There is no transmitter adjustment.Flap Control Unit
_________________
 A.  The 3 flap control units process position sensing signals for all flaps in addition to providing flap control and protection. The flap control units receive signals from all flap position RVDT transmitters and convert the signals to a serial digital format for transmission to the EIU's on an ARINC 429 bus. The left flap control unit is located on the E1-2 electronics shelf and the center and right flap control units are located on the E2-2 electronics shelf in the main electrical equipment center.
Operation (Figs. 2 and 3)
_________
 A.  Functional Description
 (1)  
When the trailing edge flaps are extended, each RVDT transmitter is rotated from its zero position. The transmitter electrical output varies as the RVDT rotates. The RVDT output signal passes to the flap control units which process the signal and route it to the EIU's for display on EICAS.

 (2)  
The FLAPS display appears on the main EICAS whenever flaps are not fully retracted. The normal FLAPS display appears for normal flap configurations and disappears 10 seconds after flaps are retracted. One of two multiple FLAPS displays appear for non-normal flap configurations.

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A

747-400
MAINTENANCE MANUAL

TRAILING EDGE FLAP POSITION INDICATION ON MAIN AND AUXILIARY EICAS DISPLAYS
FLAP CONTROL UNITS
SEE A
SEE C
SEE B
Trailing Edge Flap Position Indicating System Component Location
Figure 1 (Sheet 1)

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A
747-400
MAINTENANCE MANUAL

INBOARD POWER PACK
INBOARD POWER PACK RVDT TRANSMITTER
A
LEFT INBOARD RVDT TRANSMITTER
LEFT OUTBOARD RVDT TRANSMITTER
INBOARD FLAP TRANSMISSION
B
OUTBOARD FLAP TRANSMISSION
NOTE:INBOARD POWER PACK AND LEFT WING RVDT TRANSMITTERS SHOWN. OUTBOARD POWER PACK AND RIGHT WING RVDT
C  TRANSMITTERS SIMILAR.
Trailing Edge Flap Position Indicating System Component Location
Figure 1 (Sheet 2)

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A
747-400
MAINTENANCE MANUAL

F

5
L
A
P
S

NORMAL FLAPS

F L

5
A
LEADING EDGE FLAPS UP, DOWN, OR
P IN-TRANSIT/FAILURE
S
EXPANDED FLAPS DISPLAY

 

F
L

5

5
A P S
25 25
ALTERNATE FLAPS DISPLAY
10.00  10.00  TE FLAPS  10.00  10.00 
ACT. 10.00 
INBD DRIVE  8.75  OUTBD DRIVE  8.75 

Trailing Edge Flap Position Indicating System EICAS Displays
Figure 2

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