2-13 Figure 2-14.—Shrunken sleeve. Figure 2-15.—Typical hot-air gun. 1. Hold the heat source 4 to 5 inches away from the wire. Apply a heat of 275ºF to 300ºF for about 30 seconds. Rotate the wire while applying the heat so that the heat is evenly distributed. 2. Remove the heat as soon as the tubing conforms to the shape of the wire. Allow the tubing to cool for at least 30 seconds before handling. CAUTION Do not apply heat higher than 300ºF as this may damage the wire. Do not continue to apply heat after the tubing has shrunk onto the wire. Further application of heat will not cause additional shrinkage of the tubing. COMPRESSED AIR/NITROGEN HEATING TOOL The compressed air/nitrogen heating tool (figure 2-16) is a new tool in the fleet and was designed as a portable source of heat. This tool is safe for use around fueled aircraft because an open heating element is not required. The compressed air/nitrogen heating tool can be used on heat-shrinkable tubing.
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