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 2)  Vee shaped chips have a sharp "V" shape and apparently move into the plastic.
 (e)  Delamination (in-plane crack): A smooth surfaced crack, or a number of cracks, parallel to the window pane surface. An in-plane crack can occur in stretched acrylic and starts at the edges of the pane. A delamination can also occur because of a damaged pane. You can find a delamination from the reflection of the light from the smooth surfaces of the crack.
 TASK 56-11-21-216-002-B00
 2.  Window No. 3 Inspection_______________________
 A.  Equipment
 (1)  Optical Micrometer - Model 966A1
 Monocle Industries

 P.O. 2426
 Coppell, Tx. USA 75019
 Tel (214) 393-9920
 Fax (214) 393-9926

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A
737-300/400/500MAINTENANCE MANUAL
SINGLE CRACK
DUAL CRACK
B
A
B A
THE INITIAL SCRATCH/ CRAZING MARKS
VIEW OF WINDOW SURFACE
OUTER SURFACE THE INITIAL SCRATCH/
OF THE PANE CRAZING MARKTHE INITIAL SCRATCH/
CRAZING MARK
SINGLE
CRACK

DUAL CRACK
A-A  B-B
____NOT TO SCALE.
NOTE: THESE SECTION VIEWS AND ILLUSTRATIONS SHOW CRACKS THAT ARE LARGER THAN THE ACTUAL CRACKS,TO SHOW THE PROPERTIES OF CRACKS WHICH DEVELOP.
Window Surface Crack Development (Outer Pane Stretched Acrylic) Figure 601
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A 737-300/400/500MAINTENANCE MANUAL

SECTION OF THE INNER OR OUTER PANE WHEN THE DEFECT IS 1 INCH (25.4 mm) OR LESS FROM A BOLT HOLE CENTER LINE. THIS LIMITATION
4 EDGE CRACKS (IN-PLANE CRACKS) PARALLEL DOES NOT APPLY TO DEFECTS OF MORE THAN 1 INCH TO THE PANE FACE CAN REMAIN NOT REPAIRED
(25.4 mm) FROM A BOLT HOLE CENTER LINE.  IF IT IS IN THE GIVEN LIMITS.
Limits - Acrylic Edge Cracking
Figure 602

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A
737-300/400/500MAINTENANCE MANUAL
 B. References
 (1)  
56-11-21/401, Window No. 3

 (2)  
56-11-21/801, Window No. 3

 C. Access
 (1)  Location Zone
 101/102 Control Cabin

 D. Examine The No. 3 Window (Fig. 601).
 S 216-003-B00
 (1) Examine the window for cracks on the inner or outer panes.
 NOTE: Cracks which occur between the bolt holes and the window edge
____
 are permitted.

 (a)  
If you see cracks on the two panes, do not pressurize the airplane until you repair or replace the window.

 (b)  
If you see cracks on the inner pane, do not pressurize the airplane until you repair or replace the window (Ref 56-11-21/401).

 S 216-001-B00
 (2)  Visually examine the outer pane opposite the vent hole in the top forward corner of the inner pane.
 NOTE: Stains at this location show that the outer pane does not
____ hold pressure. Pressurize the airplane and test window for leaks. Replace the window if leak is present (Ref 56-11-21/401).
 S 216-004-B00
 (3)  Examine the window for scratches.
 (a)  Scratches on the outer stretched acrylic pane if they are larger than the specified limits.
 ~............................................................................... | Scratch | Max Length | Max Cumulative | | Depth | of Each | Length of All | | (in.) | Scratch (in.) | Scratches (in.) | ................................................................................. | 0.050 | Min. Detectable | 2.0 | | 0.020 | 1.0 | 5.0 | | 0.010 | 3.0 | 9.0 | | 0.005 | 4.0 | 10.0 | 2.......................…..........................…............................1
　
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