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AC 43.13-1B CHG 1 nonpressurized areas. Derating of the con- nectors should be covered in the specifications. 11-234. SPARE CONTACTS (Future Wiring). To accommodate future wiring ad- ditions, spare contacts are normally provided. Locating the unwired contacts along the outer part of the connector facilitates future access. A good practice is to provide: Two spares on connectors with 25 or less contacts; 4 spares on connectors with 26 to 100 contacts; and 6 spares on connectors with more than 100 contacts. Spare contacts are not normally provided on receptacles of components that are unlikely to have added wiring. Connectors must have all available contact cavities filled with wired or unwired contacts. Unwired contacts should be provided with a plastic grommet sealing plug. 11-235. INSTALLATION. a. Redundancy. Wires that perform the same function in redundant systems must be routed through separate connectors. On sys- tems critical to flight safety, system operation wiring should be routed through separate con- nectors from the wiring used for system failure warning. It is also good practice to route a system’s indication wiring in separate con- nectors from its failure warning circuits to the extent practicable. These steps can reduce an aircraft’s susceptibility to incidents that might result from connector failures. b. Adjacent Locations. Mating of adja- cent connectors should not be possible. In or- der to ensure this, adjacent connector pairs must be different in shell size, coupling means, insert arrangement, or keying arrangement. When such means are impractical, wires should be routed and clamped so that incor- rectly mated pairs cannot reach each other. Reliance on markings or color stripes is not recommended as they are likely to deteriorate with age. 9/27/01 c. Sealing. Connectors must be of a type that exclude moisture entry through the use of peripheral and interfacial seal that are com- pressed when the connector is mated. Mois- ture entry through the rear of the connector must be avoided by correctly matching the wire’s outside diameter with the connector’s rear grommet sealing range. It is recom- mended that no more than one wire be termi- nated in any crimp style contact. The use of heat-shrinkable tubing to build up the wire di- ameter, or the application of potting to the wire entry area as additional means of providing a rear compatibility with the rear grommet is recommended. These extra means have inher- ent penalties and should be considered only where other means cannot be used. Unwired spare contacts should have a correctly sized plastic plug installed. (See section 19.) d. Drainage. Connectors must be in- stalled in a manner which ensures that mois- ture and fluids will drain out of and not into the connector when unmated. Wiring must be routed so that moisture accumulated on the bundle will drain away from connectors. When connectors must be mounted in a verti- cal position, as through a shelf or floor, the connectors must be potted or environmentally sealed. In this situation it is better to have the receptacle faced downward so that it will be less susceptible to collecting moisture when unmated. e. Wire Support. A rear accessory back- shell must be used on connectors that are not enclosed. Connectors having very small size wiring, or are subject to frequent maintenance activity, or located in high-vibration areas must be provided with a strain-relief-type backshell. The wire bundle should be pro- tected from mechanical damage with suitable cushion material where it is secured by the clamp. Connectors that are potted or have molded rear adapters do not normally use a Page 11-98 Par 11-235PDF Image | AFS-640
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