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9/27/01 AC 43.13-1B CHG 1 electric contact efficiency. In other words, the contact pressure on the wire lugs should not in any way be affected by the loosening of the stud in the insulator. d. Support of Wire at Studs. Unless some other positive locking action is provided, the lug or wire should be supported next to the stud to prevent loosening the connection with a side pull on the wire. Torque recommenda tions for attaching electrical wiring devices to terminal boards or blocks, studs, posts, etc., are normally found in the manufacturer’s maintenance instruction manual. e. Feed-Through Insulator and Stud Design. Feed-through insulator design should be such as to prevent a loose insulator from failing to provide circuit isolation. It should not be able to move from between the stud and the structure, thus allowing the two to come into contact. The assembly should be so de signed that it is impossible to inadvertently misassemble the parts so that faults will result. Also, it is desirable to provide means to pre vent the feed-through stud from turning while tightening the connection. 11-177. WIRE TERMINALS AND BIND- ING POSTS. All wire terminals in or on electrical equipment, except case ground, must be firmly held together with two nuts or suit able locking provisions, or should be secured in a positive manner to equipment in such a way that no insulation material is involved in maintaining physical pressure between the various current carrying members of an electri cal connection. Terminal studs or binding posts should be of a size that is entirely ade quate for the current requirements of the equipment and have sufficient mechanical strength to withstand the torque required to attach the cable to the equipment. All termi nals on equipment should have barriers and covers provided by equipment manufacturers. 11-178. CRIMP ON TERMINAL LUGS AND SPLICES (pre-insulated crimp type). The crimp on terminal lugs and splices must be installed using a high quality ratchet-type, crimping tool. We recommend the use of the proper calibrated tool. Aircraft quality crimp tools are manufactured to standards. Such tools are provided with positioners for the wire size and are adjusted for each wire size. It is essential that the crimp depth be appropriate for each wire size. If the crimp is too deep or not deep enough, it may break or cut individ ual strands, or it may not be tight enough to retain the wire in the terminal or connector. Crimps that are not tight enough are also sus ceptible to high resistance due to corrosion build-up between the crimped terminal and the wire. MIL-C22520/2 or MIL-T-DTl2250G specification covers in detail the general re quirement for crimp tools, inspection gages and tool kits. a. Hand, portable, and stationary power tools are available for crimping termi nal lugs. These tools crimp the barrel to the conductor, and simultaneously from the insu lation support to the wire insulation. b. Crimp tools must be carefully in spected: (1) Insure that the full cycle ratchet mechanism is tamper-proof so that it cannot be disengaged prior to or during the crimp cycle. (2) If the tool does not function or faults are found, reject the tool and send the tool to be repaired. (3) The tool calibration and adjustments are make only by the manufacturer or an ap proved calibration laboratory. (4) Suitable gages of the Go/No Go type are available and shall be used prior to Par 11-174 Page 11-69PDF Image | AFS-640
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