Sidewall Lining Panels Installation (Forward Galley Doorway) 527
25-21-335 Figure 401 Nov 15/71
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
SIDEWALL INSULATION - REMOVAL/INSTALLATION
1. General
A. Removal and installation of all or any part of the sidewall insulation may be accomplished. However, due to the variety of installation methods and the lack of a typical example, the instructions which follow are of a general nature.
2. Equipment and Materials
A. Tape, Double-Faced, Permacel -Type No. 50, 1.00 inch wide
B. Tape, Single-Faced -No. 474, 2.00 inches wide, Minnesota Mining and Manufacturing Co.
3. Remove Sidewall Insulation
A. Remove one or more components of sidewall lining as may be required in order to gain access to any particular section of sidewall insulation. Refer to 25-21-311, Window Panel -Removal/Installation, and 25-21-321, Carpet Riser Panel, Removal/Installation.
NOTE: It will not be necessary to remove the air distribution ducts for access to insulation panels; when the flexible ducts are pulled slightly inboard the insulation panels may be released from behind the ducts. It may be necessary to remove certain equipment that is installed by attachments that extend through the insulation panels.
B. Remove joint tape and retainers as required. Tape and retainers securing around stringers and air ducts should be removed first.
C. When all obstructions have been removed, remove insulation panels. (In some places it may be necessary to peel the panel free of the velcro tape which is used to retain it against airplane structure.)
NOTE: Mark insulation components as they are removed so that they may be located properly when reinstalled.
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Nov 15/71 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 25-21-339 Page 401
4. Install Sidewall Insulation
A. Position insulation panels in proper location on sidewall outboard of air distribution ducts.
(1)
When installing insulation panels around windows, the blanket should contact the window reveal around the entire window periphery, with no gaps, to form an air seal.
(2)
When installing the insulation panels that are held in place with velcro tape it is necessary to align the tape on the panel with the tape that is bonded to airplane structure and then press panel down to make tape contact.
B. Install retainers where applicable.
C. Check that insulation blankets fit tightly around any structure or supporting brackets which protrude through inboard surface of insulation. Use single face tape as required to secure and seal insulation blankets tightly around these items.
D. Insulation blankets should clear stringers if possible to allow free drainage of condensed moisture. Insulation blankets should not be wrapped around stringers.
NOTE: Ceiling and wall insulation blanket segments are designed to be attached to stringer No. 4 at their overlap point.
E. Apply tape to close butt joints, overlapping joints, gaps between adjacent molded insulation panels, and between insulation panels and the airplane structure.
F. Check to ensure that all insulation components are in proper places so as not to interfere with sidewall lining or other equipment installed on the sidewall.
G. Install equipment and sidewall lining that was removed to facilitate removing sidewall insulation (Ref 25-21-311, Window Panel - Removal/Installation and 25-21-321, Carpet Riser Panel -Removal/Installation).
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25-21-339 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/77
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