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747-400 MAINTENANCE MANUAL
 LANDING GEAR STRUCTURAL FUSE POINTS - DESCRIPTION AND OPERATION
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 1.  General
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 A.  Structural fuse points are fasteners or components in the structure designed to fail first under excessive shock loads. Failure at these points minimizes damage to primary structure if components are subjected to severe impact loads. Landing gear structural fuse points and the figure number which illustrates the fuse installation follow:
 Figure No.__________ Fuse Point__________ Fastener or Component 1 Landing Gear Support Pin Assembly Beam to Rear Spar 65B11261 2 Rear Spar, Landing Gear Forward Bearing Nut Trunnion Bearing Retaining Nut 69B02400 2 Rear Spar, Landing Gear Forward Pin Trunnion Support Pin 112U1700 3 Wing Landing Gear Aft Trunnion Sleeve and Trunnion Bearing Joint 65B05230 4 Wing Gear Outboard Door Rod Forward Hinge Support Rod 65B12747 5 Wing Landing Gear Walking Beam Beam 65B01205
 (1)  
The wing landing gear is designed to break free of the airplane under extremely severe impact loads. The rear spar, to which the gear attaches, serves as the closing bulkhead for the integral wing fuel tanks. To maintain integrity of the fuel tanks under excessive shock loads, structural fuses are incorporated between the rear spar and gear components. These fuses provide points between gear and spar sufficiently strong to handle normal operating loads. However, these points will give way under excessive loads before damage to the spar can occur, which would cause fuel tank rupture.

 (2)  
Under severe impact loads, it is not desirable for the body gear or nose gear to break free of the airplane. Therefore no structural fuses are incorporated in attaching these gear to the structure.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FWD
SEE A
LANDING GEAR
SUPPORT BEAM WING LANDING GEAR AFT TRUNNIONFLAP TRACK
BEARING
LANDING GEAR
BEAM UPPER
PIN CONNECTION

SUPPORT BEAM
CHORD WEB
A
REAR SPAR
A
WING LANDING GEAR
BEAMFWD FORWARD TRUNNION BEARING
LOWER CHORD
LANDING GEAR SUPPORT BEAM
A
REAR SPAR GATE FITTING
LANDING GEAR
TANGS ON RETAINER

PIN RETAINER - ENSURE
SUPPORT BEAM
ENGAGE SLOTS IN PIN

GREASE FITTING
AND INSERT

STRUCTURAL FUSE -
SUPPORT BEAM
REAR SPAR

OUTBOARD BEARING PIN
GATE
PIN

FITTING
BEARING RETAINER
SPHERICAL
BEARING

HINGE
A-A
Structural Fuse - Landing Gear Support Beam to Rear Spar Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

SEE A
FORWARD TRUNNION BEARING HOUSING
STRUCTURAL FUSE -LANDING GEAR TRUNNION BEARING RETAINING NUT
TRUNNION FORK
FWD  TRUNNION BEARING  STRUCTURAL FUSE -FORWARD TRUNNION SUPPORT PINS (4 PLACES) 
A 

Structural Fuse - Wing Landing Gear Forward Trunnion
Figure 2

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

LANDING GEAR
SUPPORT BEAM

747-400 MAINTENANCE MANUAL
SEE A
STRUCTURAL FUSE -TRUNNION AND TRUNNION SLEEVE TO AFT TRUNNION BEARING (2 LOCATIONS EACH GEAR)
WING GEAR TRUNNION
FWD
A

Structural Fuse - Wing Landing Gear Trunnion Bolt
Figure 3

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