NOTE: Keep the decrease in surface metal to a minimum.
____
(c) If it is a problem to get through an anodic film, clean it with a rotary abrasive disk.
TASK 20-11-14-147-013
4. Clean with a Rotary Abrasive Disk
_________________________________
A. General
(1) Use this procedure to remove anodize, Iridite, Alodine, BMS 3-11 resistant finish, or equivalent hard finishes that are not painted. You can also remove paint by this procedure but the disk will become quickly clogged. Do not use this procedure on plated surfaces or metals that are not painted, for example, CRES, titanium, or alclad aluminum. Clean CRES or alclad aluminum surfaces with solvent. Hand clean titanium with abrasives or clean with solvent.
B. Consumable Materials
(1) B00109 Abrasive disk, cloth, open coat,
150-grit
C. Equipment
(1) Disc Mandrel of Applicable Size (Fig. 701)
D. Procedure
S 127-016
CAUTION: DO NOT LET PARTICLES FROM THE ABRASIVE CAUSE CONTAMINATION OF
_______ THE MECHANISMS OR ELECTRICAL EQUIPMENT. DAMAGE CAN OCCUR.
(1) Use a drill motor or other applicable drive to apply an abrasive disk of correct size to clean the necessary diameter.
(a)
Apply disk intermittently with light pressure and keep the face of the disk parallel to the metal surface.
(b)
Examine results after each time you apply the disk and continue operation until necessary area is clean.
NOTE: Keep the decrease in surface metal to minimum.
____
TASK 20-11-14-147-012
5. Remove Paint from Metal Surfaces With Lacquer Thinner or Series 84 Solvent
___________________________________________________________________________
A. General
(1)
Use this procedure to remove primer or lacquer-based paint or enamel from clad aluminum or other metal surfaces. Do not use lye, alkaline paint remover, or hydroxides to clean surfaces.
(2)
This chart gives color codes for identification of bonding brushes for individual metals.
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20-11-14
ALL ú ú 01 Page 703 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
~................................................................ | BONDING BRUSH COLOR CODE | .................................................................. | METAL COLOR CODE COLOR IDENTIFICATION | .................................................................. | Aluminum None None | | Ferritic Blue J7-42-5200 | | Magnesium Green J7-42-5700 | | Beryllium Brown J7-42-5400 | 2................................................................1
B. References
(1)
AMM 20-30-84/201, Final Cleaning of Metal Prior to Painting
C.
Consumable Materials
(1)
B00139 Lacquer Thinner - Federal Spec TT-T-266,
or equivalent
(2)
B01004 Solvent - Series 84
(3)
G00033 Lint-free cheesecloth
D.
Remove Paint
S 117-017
WARNING: DO NOT GET SOLVENTS IN YOUR MOUTH, OR YOUR EYES, OR ON YOUR
_______ SKIN. DO NOT BREATHE THE FUMES FROM SOLVENTS. SOLVENTS ARE HAZARDOUS MATERIALS. SOLVENTS MAY BE FLAMMABLE OR HARMFUL TO THE ENVIRONMENT. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
(1)
Apply lacquer thinner or a solvent, Series 84 (AMM 20-30-84) to the specified area with a clean cheesecloth.
S 117-009
(2)
Use a clean part of the cheesecloth each time you apply solvent to the surface. Make sure you do not get solvent on adjacent surfaces.
S 117-010
(3)
When the specified area is fully clean, immediately rub dry with clean cheesecloth.
TASK 20-11-14-117-011
6. Clean Bare, Clad, or Plated Metal with Solvent______________________________________________
A. General
(1)
Use this procedure to clean plated surfaces and CRES, titanium, or alclad aluminum that is not painted.
B.
Consumable Materials
(1)
G00033 Lint-free cheesecloth
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