Y.  
Close all ceiling panels that were opened for access. Refer to Curved Ceiling Panel -Maintenance Practices.

536 
25-21-341 Page 212  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/79 

SCULPTURED CEILING PANELS - REMOVAL/INSTALLATION
EFFECTIVITY
ATI INTERIOR
1. Remove Sculptured Ceiling Panel (Fig. 401)
CAUTION: EXERCISE CARE TO AVOID SOILING OR MARRING OF DECORATIVE SURFACES.
A.  Release hinges by depressing hinge-release levers (detail B).
B.  Move panel outboard (detail A) so that inboard edge disengages from air outlet extrusion (detail C).
C.  Lower panel and disconnect lanyard (section A-A); remove panel.
2.  Install Sculptured Ceiling Panel (Fig. 401)
A.  Align panel and engage each hinge (detail A):
(1)  
Depress hinge-release lever.

(2)  
Move panel hinge-half into engagement with stowage bin hinge-half, and move panel to outboard position.

(3)  
Release hinge-release lever.

B.  Connect lanyard (section A-A).
C.  Raise panel and move inboard until edge is engaged with air outlet extrusion (detail C) and hinges are locked in inboard position (detail B).
D.  Use adjusting screw (detail B) to align adjacent panels as required.
Oct 20/84 25-21-345 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Sculptured Ceiling Panel Installation  5C9 
25-21-345  Figure 401  Jun 20/84 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

SIDEWALL PANELS - REMOVAL/INSTALLATION
EFFECTIVITY
ATI INTERIOR
1. Prepare for Removal
CAUTION: EXERCISE CARE TO AVOID SOILING OR MARRING OF DECORATIVE SURFACES.
A. Remove electrical power (Ref 24-22-0, MP).
B. Remove passenger seats as necessary for access.
2. Remove Sidewall Panel (Fig. 401)
A. Remove trim strips on each side of panel by sliding strips down until clear of panel.
B. Support sidewall panel and remove screws at shockmounts.
C. Move panel down until upper edge of panel disengages from air outlet extrusion.
D. Remove sidewall light electrical connector.
E. Remove panel.
3. Install Sidewall Panel (Fig. 401)
A. Position panel and connect electrical connector.
B. Insert upper edge of panel in air outlet extrusion.
C. Align and support panel to install screws and trim strips.
D. Install screws with washers until snug.
E. Insert trim strips at bottom edges of panel and move up to lower shockmounts.
F. Tighten screws at lower shockmounts.
G. Tighten screws while installing trim strips to align panel.
4. Restore Airplane to Normal
A. Install passenger seats removed for access.
B. Restore electrical power (Ref 24-22-0, MP).
C. Check for correct operation of panel wash light.
D. Remove power if no longer required (Ref 24-22-0, MP).
Oct 20/84 25-21-346 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Sidewall Panel Installation  5C9 
25-21-346Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/83 

INSULATION BLANKET - REMOVAL/INSTALLATION
1. General
A.  These removal/installation procedures apply to insulation blankets installed in sidewall and ceiling areas of the passenger cabin. As insulation is located in areas that require a variety of installation methods, only general instructions are given.
B.  Passenger cabin insulation, besides performing an insulating and sound absorbing function, serves to prevent moisture which condenses on the inner surface of fuselage skin from leaking into the passenger compartment. Insulation is designed to allow this moisture to drain down behind sidewall and into the lower fuselage where it can be drained from airplane. To perform this function properly, the insulation must be installed with all edge flaps overlapping adjacent blankets to act as shingles and blankets must fit tightly around any structure which protrudes through insulation.
2.  Equipment and Materials
A.  Tape - Single surface, waterproof, 2 inches wide, 3M No. 474 (Ref 20-30-51)
3.  Prepare to Remove Insulation
A.  Removal of one or more components of the sidewall and/or ceiling lining will be required to gain access to any particular section of passenger cabin insulation (Ref 25-21-311 thru 25-21-361 for removal/installation of sidewall and ceiling lining components).
B.  When removing insulation in the window area of the sidewall, it will be necessary to remove the air distribution duct (Ref Chapter 21, Air Distribution System).
　
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