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 2.  Inboard Nacelle Strut Attach Fittings (Fig. 1)_____________________________________
 A.  The inboard nacelle strut is attached to the wing main frame at approximate WBL 470.0 by five pin joint fittings attached to the strut front, mid, and lower spars. An upper link, the nacelle mid spar, torque bulkhead, a side brace, and a diagonal brace engage the fittings. Engine thrust and side loads are transmitted through the nacelle strut attachment fittings into the main frame. The use of fuse pins permits clean separation of the engine and strut from the wing to prevent damage to the wing primary structure.
 B.  The upper link, fabricated from aluminum alloy tubing, connects the strut front spar fitting to the wing front spar upper fitting. The forward connection utilizes a steel fuse pin retained by a bolt and cap; the aft connection uses a steel hollow shoulder bolt.
 C.  The strut mid spar and torque bulkhead to inspar wing attachment consists of two pin-joint fittings. The strut fittings are double lug steel forgings. The wing fittings, installed on the lower exterior surface of the skin, comprise two forged titanium parts fastened together to form a T-section, single lug fitting. A tubular aluminum alloy side brace connects the strut outboard fitting to a wing lower surface fitting to transmit side loads.
 D.  An aft diagonal brace, fabricated from aluminum tubing, connects the strut lower spar and torque bulkhead to an attachment fitting on the wing lower surface in the wing mid spar area. The strut fitting is a single lug, machined aluminum alloy forging attached to the strut lower spar. Attachment to the diagonal brace is by a hollow pin retained by a bolt. The wing fitting is a T-section, single lug fitting formed by fastening two forged titanium parts together.
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A
747-400
MAINTENANCE MANUAL

WING FRONT SPAR 
TORQUE BULKHEAD 
UPPER LINK 
CLOSURE SPAR 
REAR MOUNT BULKHEAD 
FRONT SPAR 
STRUCTURAL 
FUSE PIN 
SEE  A 
FRONT MOUNT 
BULKHEAD  DIAGONAL BRACE 
STRUT FRONT  LOWER SPAR (FIREWALL) 
SPAR FITTING 
STRUCTURAL 
FUSE PIN 

NACELLE
STRUT
UPPER LINK
ATTACH FITTING
WING FRONT SPAR
SIDE BRACE WING FITTING
WING LOWER SKIN
DIAGONAL BRACE ATTACH FITTING
STRUT MID SPAR ATTACH FITTINGSINBD
A
Nacelle Strut Attach Fittings
Figure 1

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747-400
MAINTENANCE MANUAL

 3.  Outboard Nacelle Strut Attach Fittings (Fig. 1)
______________________________________
 A.  The outboard nacelle strut is attached to the main wing frame at approximately WBL 834.00 by five pin joint fittings attached to the strut front, mid, and lower spars. The attachment fittings and pins are of a similar design to the inboard nacelle fittings and are fabricated from the same material. The aft end of the upper link attaches to the wing front spar upper chord fitting. The strut mid spar and torque bulkhead fittings are attached to the wing forward attachment fittings. The aft diagonal brace connects the strut lower spar fitting to the wing aft attachment fitting. As in the case of the inboard strut installation, fail-safe fuse pins protect the wing primary structure from damage in the event of engine separation.
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747-400 MAINTENANCE MANUAL
 FLIGHT CONTROL SURFACES - DESCRIPTION AND OPERATION
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