S 958-004-B00
(4)
Apply tape to protect the window frame and the seal.
S 178-005-B00
(5)
Flush with the water and remove loose dirt and abrasives with bare hand.
E. Outer Pane External Surface Repair
S 168-007-B00
(1) Remove small clamshell surface chips, scratches, or other surface damage.
NOTE: If the surface damage is small, start with a low grit
____ abrasive to decrease the time necessary to polish the window. Do not try to repair only a local part of the surface because this this will cause optical distortion.
S 128-008-B00
(2) Remove small surface scratches and other damage with the applicable abrasive paper or cloth.
NOTE: Usually abrasive materials greater than 100 grit are not
____ necessary for gouges or deep scratches and severe crazing.
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S 178-009-B00
(3) Use sufficient water to keep the window surface cool and to flush
away the grit and the acrylic material removed.
S 178-010-B00
(4) Change abrasive paper frequently and flush well with water until all
surface damage is removed and the surface looks uniform.
NOTE:____ When you use a sander that vibrates (approximately 8000 cmp),
cover all of the surface in the horizontal direction and then
all of the surface in the vertical direction.
S 128-011-B00
(5) Continue treatment for approximately one more minute to make sure all damage is removed.
NOTE: One to two minutes of 100 grit treatment will remove
____ approximately 0.005 inches of the acrylic from the window.
S 128-012-B00
(6) Polish the window with continually more abrasive materials.
NOTE: Use 100 - 600 grit paper and micromesh cloths of 1600 - 8000.
____
S 128-020-B00
(7)
Continue each step until you remove the marks from the step before (approximately 2-3 minutes).
S 228-013-B00
(8)
Make sure the window dimensions are satisfactory.
NOTE: Minimum window thickness must not be less than 0.265 inch for
____ all outer windows in the fuselage.
S 168-014-B00
(9)
Remove water with the flannel cloth.
S 128-015-B00
(10)
Polish the window with buffing compound and a clean muslin or a wool pad.
NOTE: If necessary, use a coarse and fine compounds to get a glossy
____ finish. If you use a buffer that turns, the speed of the wheel must be 3200 fpm for a coarse compound and 4200 fpm for a fine compound.
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S 218-016-B00
(11)
Make sure that window optical quality is satisfactory. If distortion exists, repeat the above procedure, provided window will meet minimum thickness dimensions.
S 308-021-B00
(12)
If there is distortion, do the above procedure again if the window will be at the minimum thickness dimensions.
S 628-017-B00
(13)
Wax the exterior surface.
(a)
The minimum thickness of the wax on the middle window must be
0.157 inch.
(b)
The maximum depth of the defect in the inner panel (dust cover) is 0.03 inch.
(c)
To polish the defects out, polish all the surfaces that persons look through.
S 628-018-B00
(14)
Polish the window.
(15)
Cover the window with a protective coating or tape.
(16)
Install the window if you removed it.
S 868-022-B00
S 438-019-B00
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