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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CARRIAGE
FAIRING DRIVE
MECHANISM

MOVEABLEAFTFLAP DRIVE FLAP TRACKMECHANISM FAIRING
MIDFLAP TRACK
AFTFLAP ARM
TORQUE DRIVE TUBE
MOVABLE FLAP TRACK FAIRING
B
INPUT PINION
OUTPUT SHAFT
UNIVERSAL
NO-BACK
TORQUE LIMITER TRANSMISSION
C
Trailing Edge Flap
Figure 3 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B.  Each fairing consists of two parts. The forward section is rigidly attached to the wing. The aft section rotates about a hinge support on the flap track. The fairings are constructed of aluminum frames covered with epoxy reinforced fiberglass honeycomb. The fairings are actuated by a fairing drive mechanism linkage and control rod. As the flaps move, the drive mechanism pivots about the end of the flap track and positions the fairing in the proper relationship with the flap. Access panels are provided on the fairing to facilitate system adjustment.
 10. Trailing Edge Flaps (Fig. 3)
___________________
 A.  Each flap assembly is a triple-slotted flap which consists of a foreflap, midflap, and aftflap. The three flap segments are mechanically separated to form three slots as the flaps are extended. Each midflap is attached to and is supported by two flap carriages which travel on the flap tracks. The midflap is attached to two ball screw and ball nut assemblies which are each driven by a transmission to extend or retract the flap.
 B.  Foreflaps
 (1)  
The foreflaps consist of front and rear spars connected by skin panels, a curved nose skin section, and a trailing edge. The foreflaps are supported by a track which extends into the midflap where it contacts rollers. The position of the foreflap is established by sequencing carriages attached to this surface. The foreflap extends with the midflap until the sequencing carriages contact detents in the flap tracks. At this point, the foreflaps and midflaps separate and the foreflaps do not extend further aft but are rotated relative to the midflap by cam action of the sequence carriages against the flap carriages.

 C.  
Midflaps

 (1)  
The midflaps consist of three spars and honeycomb skin panels. The midflaps are connected directly to flap carriages which ride on the flap tracks. The midflaps are also connected to the flap transmission ball screw. Additional rollers on the ends of the midflap contact tracks on wing structure to provide deflection control.

 D.  
Aftflaps

 (1)  
The aftflaps are constructed in the same manner as the foreflaps. The aftflaps are supported by trunnion-mounted tubes which are connected through fittings to the midflap rear spar.

 E.  
Flap Carriage

 (1)  
Two flap carriages support each trailing edge flap. The aft end of the flap carriages extends into the nose of the midflap. The flap carriage is positioned in the midflap by two steel bearings. The aft bearing is adjustable to control the flap trailing edge vertical position and is not rigid, which allows the carriage to move relative to the midflap during flap operation. The carriage is retained by thrust collars, washers, and nuts. As the flaps are driven by the transmissions, the flap carriages travel along the flap tracks on roller bearings holding the flaps in the desired position.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 F. Flap Sequence Carriage
 (1)  Two sequence carriages are attached to each foreflap. The sequence carriages are constructed of aluminum and steel forgings. The sequence carriages travel on roller bearings on the upper flange of the flap tracks. As the flaps extend, the sequence carriages are held in position by detent in the flap carriages and travel with them. At approximately 5 degrees of flap extension, the sequence carriages contact stops on the flap tracks. The stops prevent further aft travel of the foreflap causing the foreflap and midflap to separate. Cam rollers on the sequence carriages follow cam tracks on the flap carriage thereby rotating the foreflap relative to the midflap.
　
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