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 ú (a) If bubbles coninue to get larger, open the applicable heat ú circuit breakers on the P6 circuit breaker panel. Leave the ú circuit breaker(s) open until you find the cause of the ú problem. If the window heat system does not operate correctly, ú it can cause damage to the window.
 (9)  
The inner glass pane is the primary structural component of each window. Since the glass is fully tempered, both surfaces are in compression. The scratches or chips on one of the two surfaces will cause stress concentrations. These can cause a window failure if the scratches or the chips are too deep. Conchoidal chips are permitted on these panes in the limits given. A V-shaped chip will possibly continue to become larger and you must replace the window if you find one.

 (10)
 It is not always possible to tell how a glass window will act.  A window that looks like it is in good condition can fail unexpectedly. A window that has scratches, chips or deliminations can last a long time before failure. It is not easy to make rules for a window replacement. You must consider each window individually. Operational experience, however, supports the conditions. You can use these as an aid when you determine if a window replacement is necessary.

 (11)
 Arcing occurs between two points that do not have continuity between them. A current goes from one point to the other. You can see where the arcing occurs. It usually occurs at or near the window bus bars. The bus bars are strips of conductive material painted along the top and the bottom internal side of the window. You can usually tell when the arcing occurred by the brown or black burned spots. If you find arcing in the main heating system, you must replace the window.

 (a)  Windshields with Z-channel seals can have edge heaters behind the pressure seal or have a thin wire installed in the vinyl interlayer. On windshields with installed wires, some arcing can occur. This usually shows as an intermittent glow. It is possible that you will not see the glow in the daylight. A break in the wire will cause the arcing. A small bubble (approximately 0.03 inch in diameter) will start in the vinyl interlayer. You can keep these windows installed on the airplane if the arcing does not distract the attention of the flight crew. Also, all other inspection conditions must be okay.
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 56-11-00
 ALL  ú ú B02.1 Page 202 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
INNER SURFACE CONCHOIDAL CHIP V-SHAPED CHIPS

INNER GLASS PANE
VINYL INNER LAYER OR CORE
OUTER GLASS PANE
Control Cabin Window Inner Pane Chip Identification
Figure 201

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 56-11-00
 ALL  ú ú B01 Page 203 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
EDGE OF A/C SKIN  BOLT HOLES EDGE OF WINDSHIELD

YOU CAN SEE THE VINYL SHRINKAGE FROM HERE
GLASS COCKPIT WINDOW AFT EDGE A-A
Glass Cockpit Window Cross Section of Edge Showing Vinyl Interlayer Cracking
Figure 202 (Sheet 1)

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 56-11-00
 ALL  ú ú B01 Page 204 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
INBOARD GLASS PLY
VINYL PLY
CRACK
OUTBOARD GLASS PLY
GLASS COCKPIT WINDOW B-B
INBOARD GLASS PLY
VINYL PLY
AFT EDGE INSERT
PRESSURE SEAL
BUS BAR
CRACK
OUTBOARD GLASS PLY

GLASS COCKPIT WINDOW
C-C
Glass Cockpit Window Cross Section of Edge Showing Vinyl Interlayer Cracking Figure 202 (Sheet 2)
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