(a) These are heavy three-flanged forged fittings (Ref to 57-41-0).
(2)
Flight control attach fittings.
(a) These are fittings used to attach the flight control surfaces and their actuation mechanisms to the wing (Ref 57-42-0).
(3)
Landing gear attach fittings.
(a) These are the fittings by means of which the main landing gear is attached to the wing and the fuselage. The fittings connecting the main landing gear doors and the wing are considered part of the landing gear attach fittings (Ref 57-43-0).
(4)
Engine hoist attach fittings.
(a) Six fittings located on the bottom of the wing and attached to the front and rear spar permit the attachment of ground support equipment for removal and installation of engines. (Ref 57-44-0).
500
Feb 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 57-40-0 Page 1
WING TERMINAL FITTINGS - DESCRIPTION AND OPERATION
1. General
A. The wing terminal fitting is a heavy three-flanged forging. (See figure 1.) There are four of these fittings, the two forward ones and the two aft ones. Though the concept of use is the same for the four fittings, the structure differs between the forward and the aft fittings. The flanges of the fitting act as a means of connection between the wing boxes and the center wing box.
2. Wing Box to Center Wing Box Connection
A. The wing box to center wing box connection is accomplished by the use of the three flanges of the wing terminal fitting. The places of connection is at the four corners of the center wing box where three main members join: a wing box spar, a center wing box spar and a wing root rib. At any one corner of the center wing box, the two spars and the wing root rib are attached to the three flanges of the fitting.
500
May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 57-41-0 Page 1
Wing Terminal Fittings 500
57-41-0 Figure 1 May 15/67
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
UPPER AFT WING-TO-FUSELAGE SHIM - REMOVAL/INSTALLATION
1. General
A. The upper aft wing-to -fuselage shim is composed of combinations of one to three solid shims of varying thickness and one laminated shim. Part or all of the shim may be replaced as necessary. If all of the shim is to be replaced, it may be necessary to support the airplane to relieve the load from the wing (Ref Chapter 51, Structural Repair Manual).
2. Remove Upper Aft Wing-to-Fuselage Shim
A. Remove bolt, nut, and washer securing shim to rear spar bulkhead and wing upper rear spar splice fitting (Fig. 401).
B. Remove part of shim desired to be replaced or support airplane as necessary to remove all of shim.
3. Install Upper Aft Wing-to-Fuselage Shim
A. Measure gap between rear spar bulkhead and wing upper rear spar splice fitting (Fig. 401).
B. Select proper thickness of one tapered filler and flat fillers as necessary to fill gap. Maximum gap after insertion of fillers and prior to tightening bolt should not be more than 0.007 inch.
C. Place fillers in position and drill a 0.4370 +0.0010/-0.0000-inch diameter hole through fillers to align with existing holes in rear spar bulkhead and splice fitting.
D. Install bolt, wsher, and nut. Tighten nut 270 to 300 pound-inches.
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Feb 01/76 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 57-41-11 Page 401
Upper Aft Wing-to-Fuselage Shim Installation 500
57-41-11 Figure 401 Aug 15/73
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
FLIGHT CONTROL ATTACH FITTINGS - DESCRIPTION AND OPERATION
1. General
A. The aileron attachment fittings consist of hinge and actuation mechanism fittings and these are mounted on the aft side of the rear spar, and to structure mounted on that spar.
B. The trailing edge flap attachment fittings on each wing consist primarily of two pairs of flap tracks, one pair for each flap assembly. Each flap track is an H-section forging bolted to the lower edges of the wing rear spar and wing ribs, except the inboard track of the inboard flap which is attached to the inboard end of the landing gear support beam and the aft outboard side of the main landing gear wheel well.
C. The leading edge flap attachment fittings consist of hinge fittings mounted along the forward edge of the leading edge structure, and actuator mountings on the forward face of the wing front spar.
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