Table 2-3.--Approximate Soldering Iron Size for Tinning
The operation of this basic tool is efficient and
effective and extremely simple. To operate it,
insert the wire end in the proper direction to the
depth to be stripped. Now position the wire so
it rests in the proper groove for that size wire, and
squeeze.
Heat-shrinkable tubing is a plastic-like tubing
(similar to insulation sleeving) that will shrink to
a smaller diameter with proper heating. Place the
tubing over the joint, terminal, or part needing
insulation. Now apply heat with a heat gun, oven,
or other appropriate heat source. When the tubing
reaches a specific temperature (shrink temperature
REVIEW SUBSET NUMBER 4
depends upon the type of tubing), it quickly
shrinks around the object, forming a snug
Q1. What type of wire should you use to carry
jacket. In addition to being an insulator, the
600 to 1,000 volts with a temperature rating
shrinkable tubing helps relieve strain and adds
between 302F to 500F?
waterproofing. Figure 2-14 gives some of the
typical uses of heat-shrinkable tubing.
Q2. What type of metal used in wire forms a
SOLDERING
resistant oxide film on all its surfaces?
Wires are soldered to form a continuous and
permanent metallic connection, having a constant
electrical value. When soldering, strive for
Q3. W h e n stamping wire identification
superior workmanship. If you are sloppy, you
numbers, at what interval should you stamp
create problems and compound difficulties in
the wire?
system troubleshooting techniques. Study and
refer to NAVAIR 01-1A-505 when you are
soldering.
Q4. In wire identification numbers, the suffix
The most important part of soldering is the
N means the wire completes the circuit to
selection of the correct iron for the job. Soldering
irons are available in wattage ranges from 20 to
.
500 watts. Use irons with wattage ratings of 60,
100, and 200 watts for general work in aircraft
electrical wiring. Use pencil irons with a rating
of 20 to 60 watts for soldering small parts, The
Q5. What is the most important item to consider
soldering iron for printed circuit soldering is a
when soldering?
lightweight, 55-watt iron with a 600F (316C)
Curie point tip control. This iron has a three-wire
cord, which prevents leakage currents that could
damage the printed circuits.
AIRCRAFT ELECTRICAL
When soldering, you should select a soldering
HARDWARE
iron with a thermal capacity high enough so the
heat transfer is fast and effective. (Refer to
Learning Objective: Recognize uses for
table 2-3.) An iron with excessive heat capacity
and characteristics of aircraft electrical and
will burn or melt wire insulation. One with too
mechanical hardware.
little heat capacity will make a cold joint in which
the solder does not alloy with the work.
You shouldn't always use the same mounting
parts that you removed from the installation.
A soldering iron should also suit the
Before reusing the parts, inspect them to make
production rate. Do not select a small pencil iron
sure they aren't defective or damaged. Also check
where you need a high steady heat flow.
