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9/27/01 AC 43.13-1B CHG 1 11-230. GENERAL. There is a multitude of types of connectors. Crimped contacts are generally used. Some of the more common are the round cannon type, the rectangular, and the module blocks. Environmental- resistant connectors should be used in appli- cations subject to fluids, vibration, thermal, mechanical shock, and/or corrosive elements. When HIRF/Lightning protection is required, special attention should be given to the termi- nations of individual or overall shields. The number and complexity of wiring systems have resulted in an increased use of electrical connectors. The proper choice and applica- tion of connectors is a significant part of the aircraft wiring system. Connectors must be kept to a minimum, selected, and installed to provide the maximum degree of safety and reliability to the aircraft. For the installation of any particular connector assembly, the specification of the manufacturer or the ap- propriate governing agency must be followed. 11-231. SELECTION. . Connectors should be selected to provide the maximum degree of safety and reliability considering electrical and environmental requirements. Consider the size, weight, tooling, logistic, maintenance support, and compatibility with standardization programs. For ease of assem- bly and maintenance, connectors using crimped contacts are generally chosen for all applications except those requiring an her- metic seal. (Reference SAE ARP 1308, Pre- ferred Electrical Connectors For Aerospace Vehicles and Associated Equipment.) A re- placement connector of the same basic type and design as the connector it replaces should be used. With a crimp type connector for any electrical connection, the proper insertion, or extraction tool must be used to install or re- move wires from such a connector. Refer to manufacturer or aircraft instruction manual. After the connector is disconnected, inspect it for loose soldered connections to prevent un- intentional grounding. Connectors that are susceptible to corrosion difficulties may be treated with a chemically inert waterproof jelly. 11-232. TYPES OF CONNECTORS. Connectors must be identified by an original identification number derived from MIL Specification (MS) or OAM specification. Figure 11-35 provides some examples of MS connector types. Several different types are shown in figures 11-36 and 11-37. a. Environmental Classes. Environ- ment-resistant connectors are used in applica- tions where they will probably be subjected to fluids, vibration, thermal, mechanical shock, corrosive elements, etc. Firewall class con- nectors incorporating these same features should, in addition, be able to prevent the penetration of the fire through the aircraft firewall connector opening and continue to function without failure for a specified period of time when exposed to fire. Hermetic con- nectors provide a pressure seal for maintain- ing pressurized areas. When EMI/RFI pro- tection is required, special attention should be given to the termination of individual and overall shields. Backshell adapters designed for shield termination, connectors with con- ductive finishes, and EMI grounding fingers are available for this purpose. b. Rectangular Connectors. The rec- tangular connectors are typically used in ap- plications where a very large number of cir- cuits are accommodated in a single mated pair. They are available with a great variety of contacts, which can include a mix of stan- dard, coaxial, and large power types. Cou- pling is accomplished by various means. Smaller types are secured with screws which hold their flanges together. Larger ones have integral guide pins that ensure correct align- ment, or jackscrews that both align and lock SECTION 17. CONNECTORS Par 11-230 Page 11-91PDF Image | AFS-640
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