12-25-01
ALL ú ú 01 Page 348 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
WARNING: DO NOT GET CHEMICAL CONVERSION COATING IN YOUR MOUTH,
_______ IN YOUR EYES, ON YOUR SKIN, OR ON YOUR CLOTHES. IMMEDIATELY FLUSH CHEMICAL CONVERSION COATING FROM YOUR SKIN. IF CHEMICAL CONVERSION COATING GETS IN YOUR EYES, IMMEDIATELY FLUSH YOUR EYES WITH WATER FOLLOWED BY AN EYE WASH OF BORIC ACID SOLUTION. MAKE SURE YOU PUT ON SPLASH GOGGLES OR A FACE SHIELD WHEN YOU APPLY THE CHEMICAL CONVERSION COATING. MAKE SURE YOU PUT ON A RESPIRATOR AND PROTECTIVE GLOVES WHEN YOU APPLY THE CHEMICAL CONVERSION COATING. KEEP THE CHEMICAL CONVERSION COATING AWAY FROM SPARKS, FLAME, AND HEAT. CHEMICAL CONVERSION COATING IS POISONOUS AND FLAMMABLE AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
12) Apply Alodine 1000 to the scratch with a swab, cloth, or sponge (AMM 51-21-04/701).
(b)
If the scratch penetrated the clad aluminum, do PROCEDURE III.
(c)
Do the procedure to Clean the External Surfaces of the Airplane to clean around the scratch.
(d)
If the surface is badly scratched, rub it with fine or ultrafine Scotch-Brite pads to make it smoother.
(e)
Polish with the air-driven sander/polisher as follows:
NOTE: Polish the airplane surface first with Schaffner
____ No. 521 white bar compound. Polish with the Schaffner No. 521 white bar compound until all of the gray undercast is removed. Then apply the No. 4094 green coloring bar compound.
Always clean the surface with solvent before you change to a different bar compound.
1) Remove the dried polish material from the buffer wheel with a wheel rasp or a coarse file.
2) Apply the applicable polishing compound to the buffer wheel.
3) Hold the buffer wheel parallel to the direction that you
polish.
4) Polish in the forward-to-aft direction.
5) Use sufficient pressure to remove the stains and scratches.
6) Move the buffer wheel in the correct direction to keep the
finish in a good condition.
7) Apply the applicable polishing compound to the buffer wheel frequently.
8) Remove the dried polish material from buffer wheel frequently.
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12-25-01
ALL ú ú 01 Page 349 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
9) Remove the dried polish material from the airplane surface with the wipers and solvent.
NOTE: Put solvent on the heavy polish material to make
____ it soft before you wipe it off.
10) Do the procedure to Clean the External Surfaces of the Airplane in the polished area. 11) Put some water on the surface, and make sure the water becomes drops.
12) If the surface was conversion coated before it was polished, apply Alodine 1000 with a swab, cloth, or sponge (AMM 51-21-04/701).
S 603-020
(3) PROCEDURE III - Polish the surface to repair damage that penetrates the clad aluminum.
NOTE: There is a test in PROCEDURE II to find if a scratch
____
penetrates the clad aluminum.
(a) Use the soft wipers to clean the damaged area.
NOTE: Wipe the damaged area carefully to prevent scratches.
____
(b) Remove the burr edge as follows: 1) Apply the lubricant to the burnishing tool. 2) Move the burnishing tool in the direction of the scratch so
that the clad aluminum material is moved into the defective area.
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