(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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