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 B.  Each outboard aileron is supported by six hinge support fittings attached to wing trailing edge rib structure at wing stations 1252.0, 1308.0, 1364.0, 1423.0, 1485.0, and 1548.2. These fittings are similar, with waffle type design, and are machined from aluminum forgings. Hinge fittings on the aileron front spar are bolted to the wing support fittings. The aileron actuator and reaction linkages attach to wing rear spar fittings and to aileron front spar fittings.
Flap Attachment Fittings (Fig. 2)
________________________
 A.  The inboard trailing edge flaps are mounted on flap tracks at WBL 235.2 and 353.0 by means of carriage assemblies which attach to the midflap primary structure. The flap tracks are double-web I-section beams machined from 4340 steel forgings. The tracks are installed beneath the lower surface of the wing skin and are cantilevered aft from the wing inspar structure. The inboard track is also supported by the landing gear support beam. The carriages are fabricated from steel forgings which structurally support the flaps. Through attach rollers, the carriages provide flap transition and transmit flap loads into the flap tracks. The flaps are extended and retracted by means of actuating mechanisms mounted on the wing trailing edge beam and attached to the midflap structure at WBL 246.3 and 340.7.
 B.  Support and attach fittings for the outboard trailing edge flaps are similar to the inboard flaps. Forged steel flap tracks are attached to the lower exterior surface of the wing at WBL 584.98 and 743.83. Actuating mechanisms are supported by the wing rear spar and attached to the midflap structure.
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MAINTENANCE MANUAL

HINGE WBL 461.50 
A-A 
Aileron Attach Points
Figure 1 (Sheet 1) 

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A

747-400
MAINTENANCE MANUAL

HINGE NO. 6 WS 1252.0

CLIP
NOSE SKIN LEFT BOLTHEAD OUTBOARD

RIGHT BOLTHEAD INBOARD
HINGE - TYPICAL NO. 1,2,3,5 AND 6 C-C
Aileron Attach Points
Figure 1 (Sheet 2)

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MAINTENANCE MANUAL

AFT FLAP
ATTACHMENT

ATTACH FITTING
WBL 584.977
REAR SPAR

B-B

Flap Attachment
Figure 2 (Sheet 1)

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WING LE RIB
HINGE FITTING (2 PLACES)
FOLDING NOSE
WING LE RIB
ACTUATION
LINKAGE

VARIABLE CAMBER FLAP
KRUEGER FLAPS A
PNEUMATIC DUCT (REF)
DRIVE UNIT
DRIVE UNIT
ROTARY ACTUATOR (2 PLACES)
DRIVE
SHAFT

ACTUATING LINKAGE
KRUEGER FLAP
FOLDING NOSE
VARIABLE CAMBER FLAPS
B

Flap Attachment Figure 2 (Sheet 2)
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