(3)  
Machine polishing and buffing are recommended when the equipment and an approved operator are available. You must regulate the contact pressure and the wheel to prevent overheating the surface.

 (a)  You can remove minor or superficial scratches by machine polishing or buffing with Learock No. 888 buffing compound. If it is necessary, you can do some preliminary buffing with a stitched muslin wheel and a buffing compound such as Learock S-30. Do this at a wheel surface speed of 3200 feet per minute.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

MINIMUM WINDOW PANE SECTION NECESSARY
Entry and Galley Service Window Outer Pane Allowable Rework Limits
Figure 801

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B00768
 B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Do the final high gloss polishing with Learock 888. For this, use a loose open unstitched muslin wheel with spacers or a loosely stitched flannel wheel at a surface speed of 4200 feet per minute. To make spacers, remove all the muslin disks and reduce half of them to 1/2 the original diamter. Reassemble the wheel but alternate large disks with small ones. This type of wheel reduces heating due to friction.

 (c)  
Sometimes you can find an unsatisfactory condition at the edge of the buffed area. If you hold the window at the correct angle to the light, a very slight clouded margin can be seen. One cause of this condition is insufficient wheel speed. You can eliminate this problem by increasing the wheel speed or buffing the entire surface of the window.

Equipment
 (1)  
Buffing Wheels

 (a)  
Stitch flannel buffing wheels - 4, 6, and 8 inches in diameter, 1 and 2 inches thick for 0.25 inch arbor

 (b)  
Grey No. 4M-30 or Red No. B-7 - Hanson-Van Winkle - Munning Co., Matawan, New Jersey

 (c)
Triple A - Goodison Manufacturing Co.Consumable Materials

 (1)  
Protective Coating - Spraylat SC-1071

 (2)  
Aluminum Foil Tape - Permacel P112

 (3)  
Protective Tape - Gizard Protex 20V

 (4)  
Canton (cotton) flannel cloth, clean and oil free, any source

 (5)  
Chamois - KK-C-300

 (6)  
Buffing Compound - Learock No. 888

 (7)  
Buffing Compound - Learock No. S-30

 (8)  
Dustless Acrylic Window Cleaner

 (9)  
Plex-I-Glow Cleaner and Polish

 (10)
 Wet-or-Dry Sandpaper No. 600-A to 400-AClean the Window

 S 118-000-B00
 CAUTION: MAKE SURE YOU USE THE CORRECT METHODS TO CLEAN THE WINDOW AND
_______ THE CORRECT CLEANING AGENTS. IF YOU USE INCORRECT METHODS OR CLEANING AGENTS THEY CAN CAUSE FAILURE OF THE WINDOW.
 (1)  Clean the window as follows:
 (a)  Use your bare hand and a spray of clean water to gently clean the window.
 NOTE: When you use your bare hand, you can feel and remove any
____
 sand or abrasive material.

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737-300/400/500MAINTENANCE MANUAL
 (b)  
Use mild soap and water and a soft cloth, sponge or chamois to wash the window.

 (c)  
Use clean water to flush the soap and unwanted material from the window.

 (d)  
Dry the window with clean compressed air or a clean damp chamois.

 (e)  
If the soap and water did not satisfactorily clean the window, apply a cleaning agent such as Wilco Anti-Static Plastic Cleaner with a soft tissue or flannel cloth.
　
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