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 ALL  ú ú 01 Page 3 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 WHEEL WELLS - DESCRIPTION AND OPERATION
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General
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 A.  The nose gear and main gear wheel wells are compartments for housing the retracted landing gear. The compartments are not pressurized. Bulkheads and beams serve as supports for the landing gear attach fittings and related hydraulics and electrical equipment.
Nose Gear Wheel Well (Fig. 1)
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 A.  The nose landing gear wheel well is in the lower portion of fuselage section 41 between stations 245 and 400. The wheel well consists of a forward and aft rigid box-like structure separated by the station 340 bulkhead. The forward wheel well extends from station 245 to 340 and LBL 34 to RBL 34. The aft wheel well extends from station 340 to 400 and LBL 21.35 to RBL 21.35.
 B.  The forward wall of the wheel well is formed by the canted bulkhead at station 245, and the station 400 bulkhead forms the aft pressure wall. Sidewalls consist of webs with stiffening beams which are attached to the fuselage frames and floor beams. Wheel well top panel webs are attached to the underside of the main deck floor beams. The aft sidewalls are reinforced with aluminum plate and attached to station 400 bulkhead to carry the loads transmitted by the trunnion attach fittings. A transverse fitting located on the aft side of the drag strut fitting carries the load to the side skin panels.
Main Gear Wheel Well (Fig. 2)
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 A.  The main landing gear wheel well is in the lower fuselage of section 44 between stations 1241 and 1480. It houses the wing landing gear in the forward section and the body landing gear in the aft section. The landing gear beam bulkhead, at station 1350, divides the wheel well into the forward and aft sections. It is divided into left and right sections by the keel beam and center shear web. The forward and aft walls of the wheel well are formed by the wing center section rear spar bulkhead at station 1241, and the aft wheel well bulkhead at station 1480.
 B.  Pressure barriers surround the main gear wheel well. The upper pressure barrier consists of the upper surface of the wing center section and the pressure web which extends aft from the wing center section rear spar to station 1480 bulkhead. The pressure web attaches to the underside of the main deck floor beams. The front spar bulkhead forms the forward pressure barrier and the aft wheel well bulkhead at station 1480 forms the aft pressure barrier.
 C.  The landing gear beam extends transversely across the fuselage along station 1350 bulkhead. This beam provides a support for the wing landing gear aft trunnion and strut attach fittings. The aft wheel well bulkhead serves as the principal support for the body landing gear trunnion attach fittings; and the keel beam serves as the principal support for the body landing gear drag strut attach fittings.
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 53-15-00
 ALL  ú ú 01 Page 1 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

MAIN DECK 
FLOOR BEAMS 
SEE  A 
AIRPLANE 
CANTED 
BULKHEAD 
ATTACH FITTING DRAG STRUT  34 LBL 
STA 
245 
SIDEWALL WEB 
(EXAMPLE) 
STA 340 
BULKHEAD 
FWD 
RBL 
21.35 
TRUNNION ATTACH 
FITTING 
STA 400 
BULKHEAD  A 
Nose Gear Wheel Well
Figure 1 

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 ALL  ú ú 01 Page 2 ú Oct 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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