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AC 43.13-1B 9/8/98 moisture in the connectors. A secondary bene- fit of potting is the reduced possibility of breakage between the contact and wire due to vibration. a. Connectors specifically designed for potting compounds should be potted to pro- vide environment resistance. An o-ring or sealed gasket should be included to seal the interface area of the mated connector. A plas- tic potting mold, that remains on the connector after the potting compounds have cured, should also be considered. To facilitate circuit changes, spare wires may be installed to all unused contacts prior to filling the connector with potting compound. b. Connect wires to all contacts of the connector prior to the application of the pot- ting compound. Wires that are not to be used should be long enough to permit splicing at a later date. Unused wires should be as shown in figure 11-38 and the cut ends capped with heat-shrinkable caps or crimped insulated end caps such as the MS 25274 prior to securing to the wire bundle. Clean the areas to be potted with dry solvent and complete the potting op- eration within 2 hours after this cleaning. Al- low the potting compound to cure for 24 hours at a room temperature of 70°Fto75°F or carefully placed in a drying oven at 100 °F for 3 to 4 hours. In all cases follow manufac- turer’sinstructions. 11-240. THROUGH BOLTS. Through bolts are sometimes used to make feeder con- nections through bulkheads, fuselage skin, or firewalls. Mounting plates for through bolts must be a material that provides the necessary fire barrier, insulation, and thermal properties for the application. Sufficient cross section should be provided to ensure adequate con- ductivity against overheating. Secure through bolts mechanically and independently of the terminal mounting nuts, taking particular care to avoid dissimilar metals among the terminal hardware. During inspection, pay particular attention to the condition of the insulator plate or spacer and the insulating boot that covers the completed terminal assembly. FIGURE 11-38. Spare wires for potting connector. 11-241.11-247. [RESERVED.] Page 11-98 Par 11-235PDF Image | AFS-640
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