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 NOTE: Some signs of a seal leak are as follows:
____
 a)  Windows that fog or are concave.
 NOTE: If multiple adjacent windows near doors contain
____ light amounts of fog, the seal replacement is not necessary. This can be caused by excessive humidity due to high density seating, changes in climate or location. Light fogging can be eliminated by running air conditioning packs at High Temperature to evaporate excessive moisture.
 Single windows with light amounts of fog may be caused by seal leaks and should be replaced.
 b)  Brown stains, outside in the area of the seal or inside near the vent hole in the middle pane.
 c) Seals which have moved or rolled back. 5) Replace seals which have leaks (AMM 56-21-01/401). 6) Make sure that serviceable seals are correctly installed.
 (b)  Replace a window that limits your vision, distorts or changes in thickness even in small isolated areas (AMM 56-21-01/401). 1) Do a check for a not smooth surface contour and reduced
 optical quality.
 NOTE: High temperature such as from a photo flood lamp can
____ change the contour or the optical quality.
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747-400 MAINTENANCE MANUAL
 S 356-009
 (7) Dry the window panes to cause a decrease in a concave shape.
 NOTE: The windows are put to their approximate initial contour by
____ the removal of the moisture. To dry the window, put it in air that is at room temperature. The time to dry changes because of the window shape and the local humidity. The window panes usually do not go fully to their initial contour.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 PASSENGER WINDOWS - REPAIRS
___________________________
 1.  General_______
 A.  This task contains steps to repair passenger windows that have damage.
 B.  This task applies to all the fuselage passenger windows and the fuselage plugs, and all the entry door windows.
 C.  You can grind and polish the windows to remove the damage in the windows.
 D.  Do the steps in this task while the windows are installed on the airplane. If you remove the windows to repair them, refer to the Overhaul Manual.
 E.  You can remove the chips or the scratches in the passenger windows with sandpaper, polishing, or buffing. (AMM 56-21-01/601) for the damage conditions.
 F.  Be careful when you touch the window panes to prevent more damage. Do not use materials that are not approved. Be careful not to cause scratches to the surface of the window with finger rings or other sharp objects.
 TASK 56-21-01-308-010
 2.  Outer Pane External Surface Repair__________________________________
 A.  Special Tools and Equipment
 (1)  Optical Micrometer - Model 966A1
 Monocle Industries

 P.O. Box 2426
 Coppell, Tx. U.S.A. 75010
 Tel (214) 393-9920
 Fax (214) 393-9926

 B.  Standard Tools and Equipment
 (1)  
Sanding Block - Rubber block of Shore-A Scale Durometer 35 Hardness (Optional: Wood Block with Several Layers of Flannel) (Commercially Available)

 (2)  
Sander, Vibrating - Air Driven (with rubber pad) (Commercially Available)

 C.  Consumable Materials
 (1)  
G00191 Maskant - Spraylat SC-1071

 (2)  
G00000 Tape - Aluminum Foil, Permacel P112

 (3)  
G00301 Tape - Protective Gizzard Protex 20V

 (4)  
G01990 Cotton - Flannel cloth, clean and oil free

 (5)  
B00106 Chamois - KK-C-300 oiltan leather

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