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MIL-R-23016(Wep)
3.1.22
Resistors:
The rating and placement of a resistor in a particular equip-
ment shall be such that the permitted maximum temperature at
any point on the surface of the resistor shall not be exceeded
under the highest ambient temperature or altitude specified as
a service condition for the complete equipment, with any type
of operation provided by the equipment.  Resistor type RN-10,
RN-20, RN-25, and RN-30 under Specification MIL-R-10509 shall
not be used except in hermetically sealed non-repairable
assemblies.
External Voltmeter Resistors:
3.1.22.1
External voltmeter resistors shall be in accordance with the
requirements of Specification MIL-R-10509D.
Tapped Resistors:
3.1.22.2
Fixed and variable resistors having fixed taps may be employed
where required by overall design, but their use shall be held
to a minimum.
3.1.22.3
Mounting of Resistors:
Resistors shall be securely mounted in such manner as to allow
for expansion with temperature changes. They shall not be
mounted by means of wire leads unlessu other mechanical support
is provided for the body of the resistor, except that unit
resistors whose weight does not exceed 1/2 ounce may be secured
by only their leads if the total length of both leads from a
resistor to the terminals to which the leads are secured does
not exceed 1.0 inch.  In no case shall wire leads be less than
1/8 inch.
Soldering:
3.1.23
Soldering shall be so executed that both a positive electrical
and a strong mechanical connection is assured.  No motion of
lead wires shall be permitted to take place during the solidi-
fication of the solder.
Mechanical Assemblies:
3.1.23.1
Unless specifically approved by the procuring activity, no
assembly shall depend solely on soft solder for mechanical
strength, except for variable capacitor plates and sections and
other relatively light parts that are of accepted commercial
design and that have, by actual use, proved to be generally
suitable for use in electronic equipment.
36

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