Chapter. 13. Penetration Through Pressurized Structure
Electrical Wire Bundles And Coaxial Cable Feed Through Pressurized Structure
Caution: Sealant and solvents may contain toxic and/or flammable components. Avoid inhalation of vapors and supply adequate ventilation. Wear appropriate respiratory protection while using these materials in confined areas. Avoid contact with the skin and eye.
Use a cleaning solvent and clean a larger area than required for the fairlead or connector. Remove solvent by blasting with dry air and wiping with a clean soft cloth.
263. APPLICATION OF SEALANT.
Seal electrical wire bundles and connectors where they pass through the opening in the pressurized structure.
a. Separate and coat each wire with sealant over the length which is to pass through the fairlead, figure 13.1A. After coating each wire with sealant, pull the wire bundle into position in the fairlead, figure 13.1B. Assure that the fairlead is located on the pressure side of the structure.
b. Apply sealant to the surface of the fairlead which comes in contact with the pressurized structure. Use a spatula or brush and spread sealant on the entire surface approximately 1/32 inch in thickness. Attach the fairlead to the pressurized structure, sealant, sealant should extrude around the mounting flange (see figure 13.1C).
c. Wrap the fairlead with at least three turns of masking tape as shown in figure 13.1D. Puncture the masking tape over the injection hole in the fairlead assembly and inject sealant with a sealing gun. Apply sealant over each fairlead fastener as shown in figure 13.1E.
d. Complete all of the aforementioned steps during the application time of the sealant. Allow sealant to cure, remove masking tape and excess sealant which extruded from the fairlead mounting flange.
f. Figure 13.4 illustrates various coaxial connectors frequently used for installation through structure. Fairleads are not recommended for installation of coaxial cable. Sealant application is the same as previously described.
264. - 290. [RESERVED]
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