(2)
Seal or plug all holes, gaps and inlets to assemblies containing honeycomb or foam plastic with suitable sealing or caulking material or rubber plugs to prevent entry of any solution.
(3)
Clean area to be alodized with a liquid solvent degreaser by using clean brush or rags. Dry with warm air or wipe dry.
(4)
Remove the existing organic and inorganic finish from the repair area. Remove the hydraulic fluid resistant finish at the same time the inorganic coating is stripped. Strip or manually abrade the inorganic coatings such as anodize or alodine mechanically with Tycro, Type 3A, very fine aluminum oxide unitized wheels attached to a drill motor, Scotchbrite Pad, Type A, or 400 grit aluminum oxide paper. Clean all signs of organic and inorganic coatings until a uniform, bright, shiny aluminum surface is obtained.
(5)
Wipe with dry clean cheesecloth to remove loose particles and residue from the abraded area.
(6)
Wipe with cheesecloth dampened (not saturated) with solvent. Repeat using clean cheesecloth until no visible residue transfers to the cheesecloth.
(7)
Allow to dry for a minimum of 15 minutes.
(8)
Remove any corrosion present per (1) thru (7) above.
(9)
See Chapter 57 of the Structural Repair Manual for cleaning structure and repair parts prior to the installation of sealant in integral fuel tanks.
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C. Apply Alodine 600 or 1200 solution.
(1)
Apply Alodine 600 or 1200 evenly and liberally with a fiber or nylon brush or clean cheesecloth.
(2)
Allow the solution to remain for 3 to 4 minutes to form a coating. Keep the area from drying during this period by gently blotting with cheesecloth moistened with the solution.
(3)
Rinse with clean water by gently contacting the surface with wet (not saturated) clean cheesecloth. Contact for 1 to 2 minutes and repeat with clean cheesecloth.
CAUTION: EXERCISE CARE WHEN RINSING AND DRYING TO AVOID SCRATCHING OR REMOVING THE COATING, WHICH IS TENDER WHEN FRESHLY FORMED.
(4)
Gently contact the surface with clean dry cheesecloth to absorb excess liquid. Repeat as required.
(5)
Air dry thoroughly. Filtered hot air (160°F maximum) for 15 minutes is recommended.
(6)
Apply final finish or commence adhesive bonding in accordance with Chapter 51 of the Structural Repair Manual as soon as possible after drying. Handle parts with clean gloves and keep parts clean and dry to avoid surface contamination.
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CHEMICAL AND SOLVENT RESISTANT FINISH
1. General
WARNING: FINISHES AND SOLVENTS USED IN THIS SUBJECT ARE TOXIC AND FLAMMABLE. USE ONLY IN WELL-VENTILATED AREA. AVOID BREATHING VAPORS. WHEN FINISHES OR SOLVENTS ARE SPATTERED IN EYES FLUSH WITH WATER FOR 15 MINUTES AND REPORT TO MEDICAL SECTION IMMEDIATELY. WHEN SPATTERED ON THE SKIN, WASH WITH PLENTY OF WATER.
A. An adequate ventilation system should be employed for all mixing and application of all finishes and for the solvent cleaning required prior to application of these finishes. If such facilities are not available, the use of full-face air respirators approved by the U.S. Bureau of Mines or an equivalent approved source shall be used.
B. All containers and mixing equipment must be clean and resistant to BMS 10-11 materials. Do not use wax lined containers. Dixie cup #2336 or any polyethylene-lined cup is satisfactory for distribution of mixed material for touch-up painting.
C. Clean equipment immediately after mixing. Clean up any spillage immediately.
D. The use of protective clothing shall be determined by the appropriate safety organization.
2. Equipment and Materials
A. Chemical and Solvent Resistant Finish (Fig. 701)
(1)
Primer - BMS 10-79
(2)
Enamel - BMS 10-60
B. Strainer - 60-90 mesh
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C. Spray paint equipment (Fig. 702)
D. Natural bristle brush
E. Alkaline Cleaner - GMC 528B, or equivalent
F. Abrasive paper 320 grit or finer aluminum oxide
G. Abrasive disks (grit very fine), Scotchbrite or Behr-Manning
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