BONDED LONGITUDINAL DOUBLER
ROLLED
STRINGER
(REF)
EXTRUDED
STRINGERS
(REF)
SPACING (EXAMPLE)
Skin Reinforcements Around Windows (Example)Figure 1
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D. Most longitudinal skin splices in the pressurized sections are of lap type. These splices are structural joints and pressure seals. The lap joints are riveted and fay surface sealed. All circumferential skin splices are of butt-joint type. They are either spliced through bulkhead chord at the location or through a circumferential splice strap or doubler.
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ATTACH FITTINGS - DESCRIPTION AND OPERATION
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General
_______
A. Attach fittings are part of or attached to primary structure. Their purpose is to provide a means of support for equipment necessary to accomplish the required functions of the airplane. These fittings may be of steel, titanium, or aluminum alloy extrusions, forgings, castings, or built-up sheet metal, whichever combination is required for the safety and required life of the airplane.
Electrical/Electronic Equipment Supports
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A. Supports for the electrical and electronic equipment are found throughout the fuselage. Locations range from the antenna supports on the forward pressure bulkhead to the service light on the aft end of the tail section. Supports for receptacles, switches, batteries, and wiring are also among electrical and electronic equipment supports (Ref 53-41-00).
Interior Equipment Supports and Fittings
________________________________________Fuselage Attach Fittings
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A. Fuselage attach fittings vary in size from the entry door latch fittings to the wing-to-body fittings of section 44. Locations vary from the nose radome attachments at the forward pressure bulkhead to the APU mounts in the tail section (Ref 53-43-00).
Cargo Compartment Attach Fittings
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A. Attach fittings in the forward and aft cargo compartments serve as guides to load or move the cargo containers and as restraints in securing the cargo for flight. Nets attach to the fittings in the bulk cargo compartment to separate the cargo (Ref 25-54-00).
Landing Gear Attach Fittings
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A. The primary nose, wing main, and body main landing gear supports are the trunnion supports which support the weight of the airplane on the ground and also serve as the hinge for gear retraction or extension. Drag or side strut fittings distribute loads encountered in maintaining directional stability (Ref 53-46-00).
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ELECTRICAL/ELECTRONIC EQUIPMENT SUPPORTS - DESCRIPTION AND OPERATION
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1. General_______
A. Electrical/electronic equipment supported in the fuselage include electronic equipment racks, lights, switches, antennas, and various other equipment. Locations vary from the antenna support at the forward pressure bulkhead to the tailcone service light in the tail section. The following are some of the supports in each fuselage section.
2. Supports________
A. Contained in section 41 are supports for various antennas within the nose radome, supports for the electronic racks and their cooling equipment in the main equipment center, supports for various switches and lights including emergency lights and their batteries, and main battery and associated equipment.
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