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A
737-300/400/500MAINTENANCE MANUAL
 PASSENGER CABIN WINDOWS - INSPECTION/CHECK
__________________________________________
 1.  General_______
 A.  This procedure has one task. The task is the inspection of the passenger cabin windows.
 TASK 56-21-00-206-001-B00
 2.  Passenger Cabin Window Inspection_________________________________
 A.  General
 (1)  If the window is damaged as specified in this procedure, remove the window and replace or repair the damaged components (ref 56-21-00/401).
 (a)  
Crack: A crack is not a complete break but it has width when you look parallel to the face of the crack. A crack can occur at any angle to the surface of the prismatic pane. The direction of the crack depends on the direction of the applied force. The stress from a scratch or a craze can cause a crack to occur.

 (b)  
Crazing: A crazed prismatic pane has a number of very thin cracks which are 90 degrees to the surface of the prismatic pane. Because the cracks are very thin, it is not easy to see the crazing. when you look at the prismatic pane at different angles, you can see the crazing by its reflection on the smooth surface of the prismatic pane.

 (c)  
In-plane Cracking (delamination) In-plane cracking can be a smooth fissure, or group of fissures that can occur along the surface of the pane. In-plane cracks can occur in acrylic. The cracks start at the edges of the pane or in the center of the pane. You can best find the cracks with a reflection of light from the smooth surfaces of the fissure.

 (d)  
Scratch: A scrathc occurs when there is removal of material from the surface of the prismatic pane along a line. Scratches are divided into tree types: superficial, minor, and major. superficial scratches are less than 0.001 inch in depth. This type of scratch is caused when the window is not cleaned carefully. Minor scrathes are from 0.001 to 0.003 inch in depth. Major scrathces are greater than 0.004 inch in depth.

 (e)  
Chips: A chip occurs when there is removal of material from the surface of the prismatic pane not along a line. The chip in the prismatic pane can have a circular shape or a "V" shape.

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A 737-300/400/500MAINTENANCE MANUAL

INNER PANE EDGE

1-INCH RADIUS BLEND OUT MINIMUM
CREEP DEFORMATION LIMITS

Edge Damage Limits
Figure 601

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A 737-300/400/500MAINTENANCE MANUAL

____ MULTIPLY THE APPARENT DEPTH BY
NOTE: TWO TO GET THE CORRECT DEPTH.
Optional Method to Measure the Depth of the Crazing Figure 602
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A
737-300/400/500MAINTENANCE MANUAL
SINGLE CRACK
DUAL CRACK
B
A
B A
CLAM SHELL
GROWTH LINES
INITIAL SCRATCH OR CRAZING MARKS
WINDOW SURFACE
INITIAL SCRATCHOUTER SURFACE OF THE PANE
INITIAL SCRATCH OR CRAZING MARKOR CRAZING MARK
SINGLE CRACK  DUAL CRACK
A-A  B-B
Window Surface Crack Development Example
(Outer Pane Stretched Acrylic)
Figure 603

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