NOTE: If the condition requiring repair is minor, start with a finer abrasive to reduce subsequent polishing time. Do not attempt to rework only a local part of surface area as this will result in optical distortion.
(2)
Polish window with a graduated series of abrasive materials. Use 100 - 600 grit paper and micromesh cloths of 1600 - 8000. Continue each step until the polishing marks of the previous step are removed (normally 2-3 minutes). Use alternating horizontal and vertical strokes with the vibrating sander and make sure water flow is continuous.
F. Check finished window dimensions.
NOTE: Minimum window thickness must not be less than 0.265 inch for all outer windowpanes in fuselage.
G. Remove water spray.
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H. Finish polishing the window with buffing compound and a clean muslin or wool pad. If necessary, use coarse and fine compounds to obtain a high gloss. If a rotary buffer is used, wheel surface speed should be 3200 fpm for coarse compound and 4200 fpm for fine compound.
I. Check window visually for optical quality. If distortion exists, repeat polishing procedure provided pane will meet minimum thickness dimensions after polishing.
J. Wax exterior surface
(1)
Minimum thickness of middle windowpane -- 0.157 inch.
(2)
Maximum depth of defect in inner pane (dust cover) is 0.03 inch. Polish defects out by polishing entire viewing surface.
K. Polish window with wax and cover with protective coating or tape.
L. Reinstall window if removed for rework.
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PASSENGER CABIN WINDOWS PLATE (PLUG) - REMOVAL/INSTALLATION
1. General
A. In converting from a passenger cabin window plate (plug) installation to a passenger cabin window installation, remove the plate (plug) as described in paragraph 3. To install the passenger cabin window, refer to 56-21-0, Removal/Installation.
2. Equipment and Materials
A. Cellulose Acetate Sheeting - Permacel Tape No. 76, Minnesota Mining and Manufacturing Tape No. 221 or Transparent Cellophane No. 600, Spraylat SC-1058R
B. Masking Tape
C. Cheesecloth or equivalent
D. Aliphatic Naphtha - TT-N-95, Freon TF
3. Remove Window Plate (Plug)
A. Remove protective sidewall lining or grill to gain access to window (Ref Chapter 25, Passenger Cabin Lining and Insulation).
B. Remove insulation pillow, if installed.
C. Remove clip adjusting screws and remove the ten window retaining clips (detail A, Fig. 401).
D. Disconnect grounding strap (if installed) from plate (plug).
E. Remove window plate (plug) and seal.
CAUTION: UNLESS PLATE (PLUG) IS TO BE IMMEDIATELY REINSTALLED, A PROTECTIVE COVERING OF CELLULOSE SHEETING OR EQUIVALENT, SHOULD BE APPLIED TO PLATE SURFACES TO PREVENT DAMAGE DURING HANDLING.
F. Remove seal from plate (plug). This step is only necessary if the seal is torn or damaged in any way.
4. Prepare Window Plate (Plug) for Installation
A. Remove protective cover if installed, from window plate (plug).
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