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9/8/98 AC 43.13-1B separate strain relief accessory. Strain relief clamps should not impart tension on wires between the clamp and contact. f. Slack. Sufficient wire length must be provided at connectors to ensure a proper drip loop and that there is no strain on termination after a complete replacement of the connector and its contacts. g. Identification. Each connector should have a reference identification that is legible throughout the expected life of the aircraft. 11-236. FEED-THROUGH BULKHEAD WIRE PROTECTION. Feed-through bush- ing protection should be given to wire bundles which pass through bulkheads, frames, and other similar structure. Feed-through bushings of hard dielectric material are satisfactory. The use of split plastic grommets (nylon) is rec- ommended in lieu of rubber grommets in areas subject to fluids, since they eliminate the un- satisfactory features of rubber grommets and are resistant to fluids usually encountered in aircraft. 11-237. SPECIAL PURPOSE CONNEC- TOR. Many special-purpose connectors have been designed for use in aircraft applications, such as: subminiature connector, rectangular shell connector, connectors with short body shells, or connector of split-shell construction used in applications where potting is required. Make every attempt to identify the connector part number from the maintenance manual or actual part, and the manufacturer’s instruction used for servicing. 11-238. POTTING COMPOUNDS. Many types of potting compounds, both commercial and per military specifications, are available and offer various characteristics for different applications. Carefully consider the charac- teristics desired to ensure the use of the proper compound. Preparation and storage of potting materials should receive special attention. Careful inspection and handling during all stages of the connector fabrication until the potting compound has fully cured is recom- mended. Potting compounds selected must not revert to liquid or become gummy or sticky due to high humidity or contact with chemical fluids. a. Potting compounds meeting Specifi- cation MIL-S-8516 are prepared in ready-to- use tube-type dispensers and in the unmixed state, consisting of the base compound and an accelerator packed in paired containers. To obtain the proper results, it is important that the manufacturer’s instructions be closely fol- lowed. b. Potting compounds normally cure at temperatures of 70 °F to 76 °F. If the mixed compound is not used at once, the working pot life (normally 90 minutes) can be prolonged by storing in a deep freeze at -20 °F for a maxi- mum of 36 hours. The time factor starts from the instant the accelerator is added to the base compound and includes the time expended during the mixing and application processes. c. Mixed compounds that are not to be used immediately should be cooled and thawed quickly to avoid wasting the short working life. Chilled compounds should be thawed by blowing compressed air over the outside of the container. Normally the compound will be ready for use in 5 to 10 minutes. CAUTION: Do not use heat or blow compressed air into the container when restoring the compound to the working temperature. 11-239. POTTING CONNECTORS. Connectors that have been potted primarily of- fer protection against concentration of Par 11-239 Page 11-99 (and 11-96)PDF Image | AFS-640
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