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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
ALODINE COATING - CLEANING/PAINTING
___________________________________
1. General_______
A. This procedure contains two tasks:
(1)
The first task is to apply Alodine 1000 solution.
(2)
The second task is to apply Alodine 600, 1200 or 1200S solution.
B. Alodine is used for protection. It is a paint base. Alodine 600, 1000, 1200, and 1200S, solutions are used to give the chemical coating.
C. In areas where Alodine may come in contact with BMS 10-20 primer only Alodine 600 should be used. BMS 10-20 is typically used on the fuel tank wing structure.
D. When you use Alodine 600, 1000, 1200, and 1200S obey the precautions for chemicals that can cause corrosion. Wear respirators and rubber or neoprene gloves when you mix and apply Alodine solutions. Follow the necessary precautions and do not get Alodine solutions on your skin.
E. Do not let the papers or cloths dry after you apply Alodine solutions. They can cause a fire when they are dry. After you use the cloths or paper, soak them in water before you discard them.
TASK 51-21-04-377-001
2. Apply Alodine 1000 Solution___________________________
A. Equipment
(1)
Brush, soft-bristle (fiber); Commercially
available
(2)
Container, stainless steel or acid resistance
(not lead or glass, recommend polyethylene),
Commercially available
(3)
Gloves, neoprene or rubber; Commercially
available
(4)
Respirators; Commercially available
B. Consumable Materials
(1)
G02285 Abrasive Wheel - Aluminum Oxide,
Scotchbrite Tycro, Type 3A
(2)
B00137 Abrasive Paper - Aluminum Oxide, 400-grit (minimum)
(3)
Abrasive Fabric or Pad - 400-grit (minimum)
(a) G00251 Aluminum Oxide - Scotchbrite, Type A, 3M Company
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51-21-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b) B00102 Aluminum Oxide - Bear Tex, Norton Company
(4)
C00064 Coating - Chemical conversion coating
for aluminum or aluminum alloys, (MIL-C-5541).
(5)
G00034 Cheesecloth - New, Clean, Dry, Lint Free
(6)
B00148 Solvent - Methyl Ethyl Ketone (MEK),
TT-M-261
(7)
G00116 Sponge, Cellulose (Aircraft Cleaning)
L-S-626
(8)
B00107 Chamois Scotchbrite Sheet, Finishing
Pads, Type A
C. References
(1)
AMM 20-30-88/201, Solvent - Series 88
(2)
SRM 51-20-05, Repair Sealing
D. Prepare the surface for alodine coating
S 957-024
(1) Apply tape to all adjacent areas. Do not let the Alodine solution fall on surfaces that have no tape.
NOTE: You do not have to apply tape on anodized surfaces.
____
S 397-008
(2)
Seal all holes and clearances on assemblies that have honeycomb or foam plastic. Use the applicable sealing or caulking material or use rubber plugs to prevent entrance of the Alodine solution.
S 147-009
(3)
Clean the surface with a liquid solvent grease remover. Use a clean brush or rags. Dry the surface with warm air or rub it.
S 147-025
(4)
Remove the organic, inorganic and hydraulic fluid resistant finishes from the repair area. Use the subsequent materials:
(a)
Scotchbrite Tycro, Type 3A aluminum oxide abrasive wheel attached to a drill motor.
(b)
400 grit (minimum grit number) aluminum abrasive fabric or pad.
(c)
400 grit (minimum grit number) aluminum oxide paper.
S 147-026
(5)
Remove all the material (organic, inorganic) from the area until you get a clean and shiny aluminum surface.
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