C.  Each segment of the leading edge Krueger flaps is attached to wing leading edge rib structure by two hinge fittings. The hinges are also attached to the actuating linkage which positions the flaps. The hinge fittings are machined aluminum alloy forgings.
 D.  Each of the 10 variable camber flaps in each wing is supported from wing leading edge ribs by two flap linkages which extend and contour the flap. Each linkage attaches to the flap at the three spanwise beams and to the folding nose. The actuator arm fittings are attached to the flap torque tube which is supported by adjacent wing leading edge ribs on either side. The actuator arm fittings are fabricated from steel plate or forgings; the other attach fittings are made from aluminum forgings or plate.
 4.  Spoiler Attach Fittings (Fig. 3)
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 A.  Each inboard flight spoiler (one each side) is attached by means of four hinge support fittings installed on the spoiler front spar. The fittings are bolted to mating fittings installed on the aft side of the wing trailing edge support beam between WBL 354.85 and 413.89. The fittings are machined from aluminum alloy forgings. The center fitting on the spoiler incorporates two hinge supports, as well as a spoiler actuator attach point. The spoiler actuators are attached to the trailing edge support beam.
 B.  Attach fittings for the four outboard flight spoilers on each wing are similar to the inboard flight spoiler fittings, except that the hinge and actuator support fittings are attached to the aft side of the wing rear spar between wing stations 876.53 and 1155.53.
 C.  Attachments for the ground spoilers is identical to that of the inboard flight spoilers. The hinge fittings are installed between WBL 268.19 and 327.22 on the wing trailing edge support beam.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

WING
FWD
PIVOT POINT FRONT SPAR

B-B
Spoiler Attachment Figure 3
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 LANDING GEAR ATTACH FITTINGS - DESCRIPTION AND OPERATION
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General
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 A.  The wing landing gear attach fittings consist of the forward and aft trunnion bearing support fittings, the walking beam support fittings, the side strut fittings, and the strut door hinges.
Trunnion Bearing Support Fittings (Fig. 1)
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 A.  Trunnion fittings installed on the rear spar and the landing gear support beam support the wing main landing gear strut. The trunnion centerline forms an angle of approximately 73 degrees with the rear spar. The forward trunnion bearing is supported by fittings installed vertically on the aft side of the wing rear spar. The fittings are machined from aluminum alloy forgings. The aft trunnion bearing is supported by two titanium fittings attached, one on each face, to the landing gear support beam. The fittings incorporate both longitudinal and transverse stiffener flanges normal to the fitting web.
Walking Beam Support Fittings (Fig. 1)
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 A.  The outboard ends of the landing gear walking beams and the actuator are attached by pin joints to the walking beam support. The support is a machined titanium forging and has trunnion type ends. Two lugs are provided for actuator and walking beam attachment. The trunnion ends are supported by fittings installed on the wing rear spar and landing gear support beam. The spar attachment consists of three fittings installed on the aft side of the rear spar. A modified J-section fitting is mounted vertically and closed-end I-section fittings are installed on each side near the spar upper chord to react side loads. The fittings are machined aluminum alloy forgings. The walking beam support aft trunnion fitting is also a machined aluminum forging and is attached to the forward side of the landing gear support beam upper chord.
　
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