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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

PIN
4. BEARING/PIN
3. BUSHING/BEARING RETAINER
2. BUSHING/BEARING
INDEX NO.  PART NAME  DIM.  DESIGN LIMITS  WEAR LIMITS  REPLACE PART WORN  REPAIR WORN PART  REPAIR INSTR 
DIAMETER  MITTED WEAR PER-DIM.  CLEAR-ANCE MAX DIA 
MIN  MAX 
1  BUSHING  ID  2.0495  2.0500  2.0540  0.006  X  3 
PIN  OD  2.0480  2.0490  2.0440  X  5 
2  BUSHING  ID  3.7015  3.7026  3.7052  0.0052  X  3 
BEARING  OD  3.7000  3.7010  3.6974  X 
3  BUSHING  ID  4.2006  4.2020  4.2055  0.006  X  3 
BEARING RETAINER  OD  4.1995  4.2001  4.1960  X 
4  BEARING 4  ID  2.0495  2.0500  2.0540  0.006  X 
PIN  OD  2.0480  2.0490  2.0440  X  5 

NOTE:THE WEAR LIMITS FOR THE AREAS SHOWN ARE SAME FOR ALL THE INSTALLATIONS.

YOU MUST REPLACE THE BUSHING. REFER TO THE OVERHAUL MANUAL FOR THE REPAIR INFORMATION.
THE MAXIMUM AXIAL CLEARANCE PERMITTED BEARING BALL TO THE BEARING RACE - 0.018
CAUTION:_______ DO NOT REPAIR DAMAGED OR WORN PIN. YOU MUST REPLACE A PIN THAT HAS DAMAGE.

STRUCTURAL FUSE ITEM
Wing Landing Gear Support Beam Gate Fitting Wear Limits
Figure 601 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 AUXILIARY STRUCTURE - DESCRIPTION AND OPERATION
_______________________________________________
 1.  General_______
 A.  The wing auxiliary structure basically comprises structure which does not carry primary loads and thus includes the components outside the wing main frame. This structure serves as supporting framework for aerodynamic fairings or skins, flight control surfaces and associated mechanisms, and for systems wiring, tubing, and cables.
 2.  Auxiliary Structure (Fig. 1)___________________
 A.  The wing auxiliary structure consists of three basic sections: the leading edge fixed structure, trailing edge fixed structure, and winglet. The wing leading edge fixed structure comprises ribs, braces, struts, beams, intercostals, and skins, and is cantilevered from the wing front spar to support and house the leading edge flaps and operating mechanisms. To increase fatigue resistance, a considerable portion of the exterior surface is of fiberglass honeycomb sandwich construction. The trailing edge fixed structure, cantilevered from the wing rear spar, is comprised of ribs, beams, intercostals, and skin. The trailing edge flaps, ailerons, spoilers, and respective equipment are supported by the trailing edge fixed structure. These flight control surfaces form a large portion of the exterior surface of the trailing edge. The trailing edge external surface utilizes fiberglass and aluminum honeycomb panels to a large extent because of the excellent resistance to fatigue failures. The removable winglet is cantilevered from the wing closure rib structure at wing buttock line 1247.0 and consists of skin panels, spars and ribs all made primarily of graphite composite materials. The leading edge and tip are aluminum. Included with the winglet are three fairing sections which are removable.
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 57-20-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

AIRPLANE

WINGLET
Wing Auxiliary Structure
Figure 1

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