(2)
The flaps are controlled in 4 groups: TE inboard, TE outboard, LE group A (the 8 inboard LE flaps on each wing), and LE group B (the 6 outboard LE flaps on each wing). Each group can be independently driven by electric motors if the group fails to move under hydraulic or pneumatic power.
(3)
Each flap group can operate independently in the primary hydraulic/pneumatic mode, or the primary electric mode, or together in the alternate electric mode. In either of the primary operating modes, flap movement is controlled by the FCU based on the position of the flap control lever. In alternate electric mode, flap movement is controlled from the alternate flaps control switches.
(4)
Primary Hydraulic/Pneumatic Mode
(a)
The flaps are normally operated in primary hydraulic/pneumatic mode. In this mode, the flaps are controlled from the flap control lever. Movement of the flap control lever rotates the shaft of the flap control lever RVDT assembly. The electrical output of the RVDT assembly is monitored by the FCU, which moves the flaps until flap position agrees with flap control lever position.
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A
747-400
MAINTENANCE MANUAL
M7985 TE FLAP ACTUATOR
Trailing Edge Flap Primary Hydraulic Control Schematic Figure 4
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747-400
MAINTENANCE MANUAL
LE RET
ALTN 28V DC
S1710 ALT BUS 3
TE FLAP
ARM SWITCH
ELEC CONT
INBD
P2-3 PANEL
R8076 ALT
P6 MAIN POWER
LE RET
DISTRIBUTION PANEL
INTLK
P414 LEFT POWER DISTRIBUTION CENTER
NOTE: INBD TE FLAP CIRCUITS SHOWN. OUTBOARD CIRCUITS SIMILAR.
Trailing Edge Flap Primary Electric/Alternate
Control and Asymmetry/Fail Protection Schematic
Figure 5
E88026
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UNIVERSAL JOINT
FLAP CONTROL
LEVER
POSITION
0-UNITS 1-UNITS 5-UNITS 10-UNITS 20-UNITS 25-UNITS 30-UNITS
A
747-400 MAINTENANCE MANUAL
TRANSMISSION
UPSTOP
DIMENSION X
SEE A BALL SCREW NUT
BALL SCREW
EQUIVALENT BALL SCREW POSITION INCHES (CM) 1
INBOARD X
0.72 (1.8)
0.72 (1.8)
50.79 (129.0)
57.32 (145.6)
66.67 (169.3)
70.66 (179.5)
76.72 (194.9)
OUTBOARD X
O.59 (1.5)
0.59 (1.5)
36.17 (91.9)
40.90 (103.9)
46.58 (118.3)
48.91 (124.2)
52.05 (132.2)
FWD
DOWNSTOP
DIMENSION X (SEE TABLE)
STOP
A
1 THE DIMENSIONS LISTED ARE FOR REFERENCE ONLY, THEY MAY VARY BY MORE THAN AN INCH, DEPENDING ON TOLERANCE BUILDUP.
Flap Ballscrew Positions Figure 6
F31816
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