Material No. 13-002 USA MIL-C-5541 MIL-C-81706 CLASS I/A
CHEMICAL CONVERSION COATING YELLOW ALUMINUM
(Ref. 20-31-00)
Material No. 16-001 ANTI-CORROSION PRIMER (POLYURETHANE ) (Ref. 20-31-00)
Material No. 16-005
WASH PRIMER (ZINCCHROMATE) OBSOLETE USE16-020
(Ref. 20-31-00)
Material No. 16-016 C Z-12.383
EXTERNAL DECORATION PAINT (Ref. 20-31-00)
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3. Job Set-up
__________
Subtask 32-40-00-860-056
A. Not Applicable
4. Procedure
_________
Subtask 32-40-00-110-051
A. Removal of Corrosion on Aluminum Alloy
(1) Treatment of areas that have corrosion
-
Clean the area that has corrosion with CLEANING AGENTS (Material No. 11-002).
-
Clean the paint to make sure that it is in the correct condition (flakes). Make a mark on the damaged area.
-
Remove all flakes of paint. Make the edges of the area smooth with wet-and-dry emery paper.
-
Remove the corrosion from the damaged area with an emery stone.
NOTE : The depth of the material you remove during the repair must
____ not decrease the mechanical strength of the part. If you are not sure, send the part for repairs.
-Fully degrease with CLEANING AGENTS (Material No. 11-003).
(2) Removal of corrosion-passivation
-Pickle the surface that has corrosion. Rub it lightly with a wad of cotton-wool soaked in a solution of 50% PRETREATMENT FOR PAINTING (Material No. 13-001) and 50% water.
-Flush the surface with a flow of water and do the protective treatment immediately.
(a) On the wheel rims, the hydraulic crown and the brake support :
-Prepare a solution of PRETREATMENT FOR PAINTING (Material No. 13-002) (35 g/liter) (6 oz./US Gal).
-Apply the solution to the damaged surface with a clean wad of cotton-wool.
-Let the solution stay on the surface for approximately 5 minutes. Apply more solution not less than two times but do not rub.
-Make sure that the solution covers the surface fully.
-Flush the surface with a flow of water. Dry it with filtered, compressed air. Let it dry for 12 hours at the ambient temperature.
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(b) On the torque tube, the retaining plates and the thrust plate :
-DALIC Nickel plating. Subtask 32-40-00-370-051
B. Repair of Paint that is resistant to Skydrol
(1)
Preparation of the areas to be painted
(a)
Clean the surfaces to be painted with CLEANING AGENTS (Material No. 11-002). Dry them with clean, filtered, compressed air.
(b)
Apply STRIPPERS (Material No. 12-003) with a paint-brush. If it is necessary use a brush on the surface.
(c)
If you repair the paint in a room, make sure that it is open to the air.
(d)
Never let the material touch the surfaces for more than 5 hours. CAUTION : THE MATERIAL MUST NOT TOUCH RUBBER, PLASTICS OR
_______ ASSEMBLY AREAS.
(e)
Flush the surface with water (if it is possible, under pressure), until you remove all the paint and cleaning agent.
(f)
Dry and clean the surface. Fully degrease it with a chlorine-base solvent. Make sure that there is no oxidation on the surfaces.
(2)
Preparation of paint mixtures (by volume)
(a)
Primer STRUCTURE PAINTS (Material No. 16-005) NOTE : You can keep the mixture for not more than 8 hours at 20.C
(b)
Undercoat STRUCTURE PAINTS (Material No. 16-001) NOTE : You can keep the mixture for not more than 8 hours at 20.C
____
(68.F).
1_ 100 parts of primer.
2_ 100 parts of hardener.
3_ 20 parts of thinner.
____ (68.F).
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1_ 100 parts of primer.
2_ 30 parts of hardener.
3_ 50 parts of thinner.
(c) Top-coat STRUCTURE PAINTS (Material No. 16-016) NOTE : You can keep the mixture for not more than 8 hours at 20.C
____ (68.F). You must prepare it half-an-hour before you use it.
1 100 parts of primer.
_
2 100 parts of hardener.
_
3 30 parts of thinner.
_
(3) Apply the paint NOTE : Apply the paint with a spray-gun, make an overlap on the
____ adjacent surface. Make sure that the paint and the surfaces are at the same temperature :
-between 15.C and 25.C (59.F to 77.F). The relative humidity must be between 35% and 75%.
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