(4)
BMS 5-89 corrosion inhibiting adhesive primer (CIAP) is required production primer for all structural bonded assemblies. The structural bonded assembly receives a subsequent coating of BMS 10-11 or BMS 10-79 primer on top of CIAP where added corrosion protection is specified. In many instances, coat of CIAP becomes the final protective coating for non-bonded surfaces where added corrosion protection is not specified. Coating with BMS 10-11 or BMS 10-79 primer is recommended because they provide equal or better corrosion protection and their coloring makes it obvious that desired coverage is obtained.
C. Exterior surfaces requiring special protective finishes.
(1)
Yellow primer and gray enamel on critical corrosion areas including wing and empennage spar cavities, cove areas, and wheel wells.
(2)
Yellow primer and Corogard on wing upper inspar skins and other selective areas.
(3)
BMS 10-79 primer and BMS 10-60 flexible polyurethane enamel on wing lower inspar skins, and leading and trailing edge panels of wing, fin and stabilizer. This finish system is also recommended for structure surrounding the emergency exit hatches, outboard flap track fairings and skate angles for flap track and engine nacelle to wing fairings.
2. Hydraulic Fluid Contamination Areas
A. Certain areas on the airplane are subject to contamination by hydraulic fluid. See Fig. 1 for the locations of the possible hydraulic fluid contamination areas.
3. Exterior Decorative Markings
A. Exterior decorative marking drawing is listed on the following Boeing drawing 65-61373.
506
Feb 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-0 Page 1
F85004
Hydraulic Fluid Contamination Areas 502
51-21-0 Figure 1 Nov 15/69
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PROTECTIVE FINISHES
1. General
A. Protective and exterior decorative finishes maintenance practices are covered in the following sections.
B. Certain processes, requiring the use of a powder in which some form of chromic acid is present, can constitute a fire hazard unless proper precautions are taken. Alodine powder is such a substance and it can ignite if it is allowed to make physical contact with organic solvents or combustible solid materials such as paper or rags. Other processes which, though not described in this manual, use similarly hazardous powder, include chromic acid anodizing, chromium plating, Dow 17 magnesium coating and Iridite, which is an aluminum corrosion coating, MIL-C-5541, alternative to alodizing.
C. Before paint is applied to any surface on the airplane the surface must be prepared to receive the paint. The surface must be dry and free of any dust or oily residue. Therefore, it is essential that the processes required for the preparation of metal surfaces be strictly adhered to if a durable paint application is to be made. The particular paint stripping compounds specified will provide maximum efficiency for ordinary field work and care must be taken when other strippers are used as they may be corrosive towards aluminum, magnesium, cadmium and steel. Where the surface conversion coating has been damaged or penetrated during corrosion removal, brush alodizing is to be applied to provide a receptive surface for painting and to protect the base metal. The Alodine 1200S coating may have a golden iridescent color which may vary with different alloys and processing conditions. The Alodine 1000 is a clear coating for use on clad aluminum alloy parts and is not recommended for use on magnesium or magnesium alloys. All magnesium is to be treated with Dow 19.
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May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-0 Page 701
D. The following safety precautions shall be taken when applying solvents, cleaners, strippers, etchants or conversion coatings.
(1)
Avoid prolonged breathing of solvent vapors. Solvents must not be used in confined spaces without adequate ventilation or approved respiratory protection.
(2)
Avoid prolonged or repeated contact of solvents, cleaners, etchants, or conversion coating materials with skin. Rubber or plastic gloves should be worn when using solvents or cleaners and shall be worn when using paint strippers, etchants or conversion coating materials. Goggles or plastic face shields, rubber raincoats and rain hats shall be worn when cleaning, stripping, etching or conversion coating overhead surfaces.
(3)
Any paint stripper, etchant or conversion coating material on the skin should be washed off immediately with water.
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