(5)
 Clean the inboard surface of the window panes of the upper sidewall panels and the passenger/crew door windows (Ref. TASK 12-21-12-100-004).

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R  **ON A/C 301-399, 
R  Subtask 56-21-13-941-051-A 
R  A. Aircraft Maintenance Configuration 
R  (1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position in front 
R  of: . 
R  - the applicable passenger/crew door at the zone 831 or 841 or 832 or 
R  842 
R  - the applicable emergency exit door at the zone 833 or 834 or 843 or 
R  844. 
R  (2) Open: 
R  - the applicable passenger/crew door 831 or 841 or 832 or 842 
R  (Ref. TASK 52-10-00-010-001) 
R  - the applicable emergency exit door 833 or 834 or 843 or 844 
R  (Ref. TASK 52-22-00-010-001). 
R  (3) Do the special precautions before you start work on the 
R  passenger/crew door (Ref. TASK 52-10-00-860-001) and on the emergency 
R  exit door (Ref. TASK 52-22-00-860-003). 
R  (4) Clean the outer surface of the outer window panes of the cabin 
R  windows, the passenger/crew door windows and the emergency exit door 
R  windows (Ref. TASK 56-21-13-100-002). 
R  (5) Clean the inboard surface of the window panes of the upper sidewall 
R  panels, the passenger/crew door windows and the emergency exit door 
R  windows (Ref. TASK 12-21-12-100-004). 
R  **ON A/C ALL
 4. Procedure_________
 (Ref. Fig. 601/TASK 56-21-13-991-009, 602/TASK 56-21-13-991-001, 603/TASK
 56-21-13-991-002, 604/TASK 56-21-13-991-008, 605/TASK 56-21-13-991-011)

 Cabin Window Panes - Examples of Damage Figure 601/TASK 56-21-13-991-009
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 Cabin Window (outer pane) Inspection/Check Figure 602/TASK 56-21-13-991-001
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 Cabin Window (inner pane) Limits Figure 603/TASK 56-21-13-991-002
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 Inspection Procedures Figure 604/TASK 56-21-13-991-008
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 Passenger/Crew Door Window Pane Damage Criteria Figure 605/TASK 56-21-13-991-011
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 Subtask 56-21-13-210-051

 A. Inspection
 (1)
 Do a visual inspection of the inner and outer window panes of the cabin windows for possible damage. Look for (Ref. Fig. 601):

 -crazing (1), (small cracks that go in all directions)
 -deep scratches or surface cracks (2), (without crazing)
 -fine scratches or surface cracks (3), (with crazing)
 -crazing (4), (small cracks that go in one direction)
 -cracks (5), (usually extend through the full material thickness) - orange peel effect (6), (irregular cracks on or below the surface)
 -fine scratches (7), (can become cracks)
 -chipping (8), (usually only at the window pane edges)
 -delamination (9), (slatelike separation of the material)
 -pitting (10), (affect when hard particles hit the surface)
 -vent hole damage (11), (small chip from the edge of the hole).

 (2)
 You must use a FLASHLIGHT (with a halogen lamp) held at different angles to look for damage in the window panes.

 (3)
 If you find damage during the inspection of the window panes:

 -
you must measure the length and the depth of the damage, (Refer to steps (4) and (5))

 -
you must replace the window panes that have damage that is more than the permitted limits.

 (4)
 Measure the length of the damage, as follows:

 (a)
 Put the transparent graph paper on the damaged area of the window.

 (b)
 Put the light source at 90 degrees to the opposite surface of the window pane.

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 (c)
 Set the light source to ON.

 (d)
 The length of the damage shows as a dark line on the graph paper. Make a mark at each end of the line and measure and record the distance between the two marks.

 (5) Measure the depth of the damage, as follows:
　
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