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b)  Windows can be returned close to their original contour by removing them from airplanes and drying them. This can be accomplished by leaving them exposed at room temperature. Drying time is depended on local humidity and how badly window is deformed.
NOTE: Windows generally do not return completely to original contour.
c) Check seals for leakage into window cavity between outer and middle pane. d) Check window edges thoroughly for in-plane cracking per par. (3). e) Replace concave windows with leaking seals.
(8)  Examine middle pane for warping and deformation.
(a)  Minor warping or deformation alone is not a cause for rejection unless pressure sealing is affected.
CAUTION:  REPLACE MIDDLE PANE IMMEDIATELY IF PRESSURE SEALING IS AFFECTED. PRESSURIZATION INTEGRITY OF FUSELAGE IS CRITICAL BECAUSE FAIL-SAFE FEATURE HAS BEEN ELIMINATED.
500 
Feb 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-22-0 Page 609 

H26337
Center Pane Damage Due to Window Clip  500 
56-22-0  Figure 604  Jun 20/89 
Page 610 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

DOOR-MOUNTED WINDOWS - DESCRIPTION AND OPERATION
1.  General
A.  The windows in doors are of similar design and each window consists of three panes of acrylic sheet. (Fig. 1) The outer and center panes are designed to withstand cabin pressurization loads and are supported by a peripheral seal and a retainer. The retainer is attached by three screws to the door structure with a rubber seal between the structure and retainer. Three backup clips are provided to hold the peripheral seal against the inner pane. A reveal attached by screws to the door structure, provides a duct between the inner pane and the center pane. The inner pane, which is a non-structural component, is mounted in a vinyl support, which is bolted to the door lining. The inner pane can be readily removed with a smooth soft spatula or the handle of a comb. A spacer is provided between the inner pane support and the reveal.

H30528
527  Typical Door-Mounted Window 
Nov 01/73  Figure 1  56-31-0 
Page 1 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

DOOR-MOUNTED WINDOWS - REMOVAL/INSTALLATION
1. General
A.  The entry and galley door windows consist of three panes. The outer and center panes are frame mounted and each is capable of taking full cabin pressurization loads. The inner panel is nonstructural and is mounted in the door lining.
2.  Equipment and Materials
A.  Cellulose Acetate Sheeting
B.  Masking Tape
C.  Boiled Cheesecloth
D.  Castile Soap
3.  Remove Door-Mounted Windows
A.  Remove door lining and insulation as necessary to gain access to window. Refer to Door Lining and Insulation, Chapter 52.
B.  Apply protective cover to accessible surfaces of window panes which are to be removed and later reinstalled.
C.  Remove three frame mounting bolts (2, figure 401) holding window assembly in position.
D.  Remove window assembly.
E.  Remove outer pane (5) by lifting edge of peripheral seal (3).
F.  Remove center pane (4).
(1)  
Remove three backup clips (6) holding center pane (4) in position.

(2)  
Lift peripheral seal (3) and remove center pane.

G.  Apply protective cover to uncovered surfaces of any panes which are  removed, but will be reinstalled.
4.  Install Door-Mounted Windows
A.  Remove protective covering from inner surface of outer pane (5, figure 401) and from outer surface of center pane (4).
500 
May 15/67  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  56-31-0 Page 401 

B.  Clean inner surface of outer pane and outer surface of middle pane with lukewarm water and castile soap. Use a soft, clean cloth to transfer the soap solution to the pane surface, but go over the surface with the hand only, so that any dirt can be quickly detected and removed before it scratches the surface.
C.  Wipe dry with a clean, damp chamois.
CAUTION:  DO NOT RUB SURFACE WITH A DRY CLOTH. IT CAUSES SCRATCHES AND BUILDS UP AN ELECTROSTATIC CHARGE WHICH ATTRACTS DUST PARTICLES.
D.  Clean accessible areas around opening between outer and middle pane. Refer to Chapter 12, Cleaning and Washing.
E.  Install pane or panes in peripheral seal (3).
CAUTION:  HANDLE ASSEMBLY WITH CARE, STIFFNESS OF THE PERIPHERAL RUBBER SEAL IS THE ONLY THING HOLDING PANES IN PLACE AT THIS STAGE.
F.  Install three backup clips (6) which secure center pane in position in window assembly.
　
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