KEEL BEAM BLOWOUT PANEL - REMOVAL/INSTALLATION
1. General
A. The keel beam blowout panel is located on the centerline of the airplane forward of the main wheel well. The function of the panel is to relieve excess pressure inside the keel beam due to a ruptured APU duct. The panel is hinged and will blow open when special attaching rivets are sheared. The panel incorporates a deflector to keep the panel open in flight. Decals specify replacement rivets.
2. Keel Beam Blowout Panel Removal/Installation
A. Equipment and Materials
(1)
Rivets - MS20470A, 1/8-inch diameter
(2)
Sealant - BMS 5-79 class B8, and parting agent
(3)
Solvent - methyl ethyl ketone
(4)
Wooden or plastic spatula
B. Remove Keel Beam Blowout Panel
(1) Clean debris as required.
C. Prepare for Installation
(1)
Clean old sealant from faying surfaces by scraping with wooden or plastic spatula and then cleaning with solvent.
(2)
Apply parting agent to the outside faces of the fairing faying surfaces. Refer to Chapter 51, Seals and Sealing - Maintenance Practices.
(3)
To prevent blowout panel from rocking and assist in panel seating apply BMS 5-79, Class B-2, sealant to the inside faces of the panel faying surfaces just prior to installing panel. Apply as a continuous or broken seal. Refer to Chapter 51, Seals and Sealing -Maintenance Practices.
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Nov 15/70 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 53-12-11 Page 401
CAUTION: APPLY HAND PRESSURE TO SEAT PANEL. DO NOT DISTORT OR PRELOAD PANEL DURING INSTALLATION. REMOVE ALL EXCESS SEALANT FROM INSIDE AND OUTSIDE OF PANEL. USE MINIMUM AMOUNT TO PREVENT A PANEL OUT OF FAIR CONDITION.
D. Install Keel Beam Blowout Panel
(1)
Check attachment clips for damage and door for free motion at hinge line.
(2)
Install panel with two MS20470A 1/8-inch rivets.
CAUTION: PROPER FUNCTIONING OF THE BLOWOUT PANEL DEPENDS ON USE OF RECOMMENDED RIVETS.
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53-12-11 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/70
STRUCTURE AROUND OPENINGS - DESCRIPTION AND OPERATION
1. General
A. The fuselage structure around all door openings is reinforced to ensure adequate distribution of fuselage loads around the opening.
B. The passenger window openings are reinforced by doublers forming part of the inner waffled skin. (See figure 1.)
C. The control cabin window frames are reinforced fabrications of extruded sections.
D. Around all entry, cargo and access door openings additional inner skins are applied, together with additional stringers and frames as local design conditions have demanded.
H29150
500 Fuselage Window Cutout
Apr 15/66 Figure 1 53-13-0
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
WHEEL WELLS - DESCRIPTION AND OPERATION
1. General
A. The main landing gear wheel wells are on either side of the keel beam and between the fuselage frames at body stations 664 and 727. The upper surface of the wheel wells is formed by a solid web. The web attaches to the lower flanges of the floor beams. The web and the lower lobe of the frame at station 727 are pressure walls. Screens are installed in the main wheel well for protection of equipment against tire burst.
B. The nose landing gear wheel well is in the lower forward fuselage between body station 227.8 and 294.5. The well is a rigid box structure consisting of a ceiling, two sidewalls, and a forward and aft wall. The ceiling web is attached to the underside of the control cabin floor structure. The webs of the frames at body stations 227.8 and 294.5 form the forward and aft walls. The sidewall webs are attached to frame structure. The entire box is a pressure wall.
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Aug 01/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 53-14-0 Page 1
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