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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
STA 520
CREW COMPARTMENT
OVERHEAD HATCH
SEE C
STA
PRESSURE 140
BULKHEAD
SEE B
RADOME
SEE A
STATION 240
CANTED BULKHEAD FLOOR-TO-SKIN
SHEAR TIES
SEE D
FWD
STA 140
NOSE LANDING
GEAR WHEEL WELL
STRINGER
ATTACHMENT
(EXAMPLE) STATION 340
BULKHEAD
AFT RING STATION 400 STA 520
BULKHEAD
ELECTRICAL/
ELECTRONICS
ACCESS DOOR
FORWARD
RING A
FLAT WEB
FWD
PRESSURE BULKHEAD
B
Nose Section, Section 41
Figure 1 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
UPPER DECK 307.5 WL 520 STA
MAIN DECK 199.8 WL REINFORCEMENT DOOR
(EXAMPLE) STRINGERS
FRAME STRINGER BEAM FLOOR C (2 LOCATIONS) MAIN ENTRY DOOR FWD
SHEAR TIES FLOOR-TO-SKIN
D
Figure 1 (Sheet 2) Nose Section, Section 41
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
SEE A
FRAME
SKIN
B FAIL-SAFE STRAP
STRINGER
CUTOUT
B
FORMED CHORD
REINFORCING
ANGLE
B-B
A
Frame and Stringer - Section 41 (Example)
Figure 2
STRINGER
STRINGER CLIP
LOCAL CHORD REINFORCING
C
L
STA
BASIC
FRAME
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
5. Floor-to-Skin Shear Ties (Fig. 1)
________________________
A. The floor-to-skin shear ties extend along both sides of the fuselage, level with the floor at each deck. Two types of shear ties are used. A punched and formed sheet metal type is most common but a truss-type is used where decompression venting provisions are required. The shear ties are attached to fuselage skin stringers, floor beams, and body frame.
6. Flight Compartment Window Opening Reinforcements (Fig. 3)
________________________________________________
A. The flight compartment window and windshield posts form a truss tied to the body frames. The forward and aft of the aft window is part of a reinforced portion of body station 320 and 340 frames. The portion of the body frame at station 320 that separates the forward and aft side windows is known as No. 3 post. No. 2 post separates the windshield from the forward side window and No. 1 post separates the left and right windshields (detail A, sheet 2).
B. All posts are of two-piece fail-safe construction so that, should one member fail, the remaining member can safely carry the load. Upper and lower sill chords of the side windows are extrusions. All sill chords and posts are aluminum alloy extrusions except the windshield lower sills and the No. 1 post. The windshield lower sills are machined aluminum forgings and the No. 1 post is a machined extrusion of aluminum alloy. The posts are continuous beams, splicing to and continuing through the sills to effect maximum rigidity with least visual blocking. The upper sill is a torque box extending around the entire window pattern from station 340 bulkhead, left to right side. The main lower sill is a continuous beam extending forward and below the windshield aft to station
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