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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 Ceiling Insulation
A.  Remove one or more components of ceiling lining, as may be required in order to gain access to any particular section of ceiling insulation. Refer to 25-21-341, Curved Ceiling Panel -Removal/Installation.
B.  Remove joint tape and retainers as required.
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.
4.  Install Ceiling Insulation
A.  Position insulation panels in proper location on ceiling.
(1)  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.
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Nov 15/71  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  25-21-349 Page 401 

 

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 ceiling lining or other equipment installed on the sidewall.
G.  Install equipment and ceiling lining that was removed to facilitate removing ceiling insulation (Ref 25-21-341, Curved Ceiling Panel - R/I).
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25-21-349 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Nov 15/77 

CEILING INSULATION - APPROVED REPAIRS
1. General
A. For approved repairs information refer to 25-21-339, Sidewall Insulation - Approved Repairs.
527 
Feb 15/72  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  25-21-349 Page 801 

FORWARD LOWERED CEILING PANELS - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes with
Carry-All Compartment Interior

1.  General
A.  The forward lowered ceiling comprises individual panels as described in this section. The panels are arbitrarily assigned numbers, as shown in Fig. 401, to assist in identification within these procedures only.
B.  The procedure which follows describes the operations necessary to remove the entire lowered ceiling. If desired, any one lowered ceiling panel can be removed after opening appropriate access panels for access to panel attachments. In some cases, adjacent lowered ceiling panels will need to be removed to allow removal of the desired panel.
C.  Depending upon the passenger cabin arrangement, certain items of passenger equipment are installed under the lowered ceiling and will obstruct removal of some lowered ceiling panels.
2.  Equipment and Materials
A.  Vinyl Tape - Permacel No. 295, 2 inches wide
3.  Remove Forward Lowered Ceiling Panels (Fig. 401)
A.  Remove panels No. 7 and 8.
(1)  
Open overhead stowage compartment beneath ceiling panel.

(2)  
Push up on latch trigger of each outboard latch and allow outboard side of panel to move down.

(3)  
Support inboard edge and move ceiling panel outboard until inboard edge is free of support angle.

(4)  
Open ceiling light circuit breakers on panel P18.

(5)  
Disconnect wire bundle for ceiling light and unhook lanyard.

(6)  
Support ceiling panel and remove hinge spring pin from both outboard latches.

(7)  
Lower and remove ceiling panel.

(8)  
Reinstall hinge spring pin in trunnion on each outboard latch.

May 15/79 25-21-351 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

B.  Remove Panel No. 1
(1)  
　
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