(2)
Water - Not more that 150 ppm total disolved
solids
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(3)
B00192 Solvent - General Purpose, BMS 3-2,
Type I
(4)
G00215 Brush - Cleaning, Soft-Bristle
B. References
(1) AMM 20-41-01/201, Static Grounding
C. Clean the skin as follows:
NOTE:____The skin must be clean for the Alodine treatment. You must follow this procedure fully.
S 587-011
(1)
Make sure the airplane is not in the sunlight and that the airplane is grounded (AMM 20-41-01/201).
S 117-012
(2)
Clean the surface:
(a) To make the solution to clean the surface, mix the following ingrediants in a clean container:
- one part (by volume) solvent alkaline cleaner
-two parts water
-five to six parts BMS 3-2 Type I solvent.
(b)
Apply the cleaner to the surface and let the cleaner soak for a minimum of 10 minutes. Do not let the cleaner dry on the surface. If it is necessary, apply more cleaner to the surface.
(c)
Rub the surface with a soft-bristled brush. Make sure the countersunk areas and rivet heads are clean.
(d)
Use a high pressure hose to flush the area with water.
(e)
Flush the surface with water until you get a water break-free surface.
NOTE: A water break-free surface will have a continuous layer
____ of water for 30 seconds.
TASK 51-24-07-307-013
5. Brush the Alodine Finish
________________________
A. Consumable Materials
(1)
G00268 Brush - Paint, Nylon or Bristle
(2)
G00378 Alodine - 1200 or 1200S
B. References
(1) AMM 51-21-04/701, Alodized Surfaces
C. Procedure
S 377-014
(1) Apply the Alodine 1200 or 1200S finish to all cleaned steel fastener heads and the adjacent aluminum skin surfaces (AMM 51-21-04/701).
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747-400 MAINTENANCE MANUAL
TASK 51-24-07-307-015
6. Apply the Sealant to Fasteners______________________________
A. General
(1)
You can use sealant to make an area level with the aluminum skin and to fill the area below the heads of installed fasteners.
(2)
Make sure the alodine surface is clean before you apply sealant.
(3)
Install rivets dry, unless you are told differently.
NOTE: Install 5056 aluminum rivets wet with sealant in aluminum
____ structure. Install 5056 aluminum rivets dry in magnesium structure.
B. Equipment
(1)
Extrusion gun or spatula
(2)
Fairing Tool - Plastic scraper or duckbill nozzle
(3)
Knife - Made from 2024 aluminum sheet with a beveled cutting edge
(4)
Pressure spray equipment - standard type
(5)
Gum rubber buffing wheel
C. Consumable Materials
(1)
B00148 Solvent - Methyl Ethyl Ketone (MEK),
TT-M-261
(2)
B00351 Trichloroethylene, 0-T-634
(3)
B00184 Solvent - BMS 11-7
(4)
C00066 Solvent - Toluene, TT-T-266A
(5)
G00034 Cheesecloth - Clean and Lint-Free
(6)
A00248 Sealant - PR1422, Class A, Parts A and B
(7)
A00250 Sealant - PR1422, Class B, Parts A and B
(8)
A00247 Sealant - PR 1432GP, Parts A and B
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