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 A.  The winglet is an aerodynamic device designed to improve the performance of the wing by reducing drag. It is attached to the outboard end of the wing on special fittings incorporated into the wing end rib.
 B.  The construction of the winglet follows standard airfoil practice, using a structure of spars and ribs enclosed by a skin which provides the shape of the winglet.
 C.  The winglet is faired into the wing by rigid fairings which are attached
 to the winglet and wing.Structure
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 A.  The two spars, front and rear, are composite structures built up from a Nomex honeycomb core and epoxy impregnated graphite fabric plies. The front spar is the mount for the leading edge.
 B.  The winglet has two rib locations, one root rib and one tip rib. The root ribs have nutplates to allow mounting of fairings. The root rib is made in three parts, the leading edge root rib, the root rib and the trailing edge rib.
 (1)  
The leading edge root rib is made of a sheet of aluminum with aluminum channel stiffeners.

 (2)  
The root rib and trailing edge rib are composite structures built up of Nomex honeycomb cores and epoxy impregnated graphite fabric plies.

 (3)  
The tip rib is built up of epoxy impregnated graphite fabric plies.

 C.  The two mounting fittings extend from the root rib to the front spar.
 These fittings are made of forged aluminum.Skin
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 A.  The major skin panels extend from the front spar to the trailing edge. The panels are composite construction built up of Nomex honeycomb cores and epoxy impregnated graphite fabric plies. The inboard panel is attached to the spars and ribs by hilocks. The outboard panel is attached to the spars and ribs by bolts into nutplates.
 B.  The leading edge is attached to the front spar by rivets. The construction of the leading edge is sheet aluminum over formed aluminum ribs.
 C.  The tip is attached to the tip rib by rivets. The tip has three parts, the forward and mid parts are made of sheet aluminum joined by splice plates. The aft part is an aluminum casting.
 D.  The winglet is faired into the wing by forward, mid, and aft wing extension fairings.
 (1)  The mid fairing is made in three parts all of which are attached by bolts into nutplates to the winglet's root rib and wing extension closure rib. The mid fairing parts are primarily composite construction with an aluminum leading edge portion.
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747-400
MAINTENANCE MANUAL

SECTION

Winglet
Figure 1

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747-400
MAINTENANCE MANUAL

EDGE ROOT RIB
Winglet Structure
Figure 2

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MAINTENANCE MANUAL

 (2)  The aft fairing is composite construction and is attached by bolts into nutplates on the wing extension trailing edge closure rib. The aft fairing is not attached to the winglet. Instead of attaching the winglet to the fairing, the winglet rests against the fairing on a bulb seal.
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