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MIL-PRF-39015 Resistors, Variable, Wirewound, \(Lead Screw Actuated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), lead screw actuated; wirewound variable resistors with a contact bearing uniformly over the surface of the entire resistive element, wound linearly, when positioned by a multiturn lead screw actuator. These resistors are capable of full load operation \(when the maximum resistance is engaged\), at a maximum temperature of 85OC and are capable for continuous operation, when properly derated, at maximum temperature of 150OC \(see 3.6\), with a resistance tolerance of ??5 percent. The ER resistors have life failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.4\). These FR levels are established at a 60 percent confidence level on the basis of life tests.

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MIL-PRF-39015E
4.7 Periodic group B inspection (ER only). Periodic inspection shall consist of group B inspection tests
specified in table IX, in the order shown. They shall be performed on sample units selected from lots that
have passed the group A inspections. Except where the results of these inspections show
noncompliance with the applicable requirements (see 4.7.5), delivery of products which have passed
group A inspections shall not be delayed pending the results of these periodic inspections.
TABLE IX. Group B inspection.
Inspection
Requirement
Method
Number of
Number of
paragraph
paragraph
samples
defectives
Quarterly
Subgroup 1
Life
Quarterly
Subgroup 2
1/
12 6 highest
Resistance temperature characteristic
6 lowest
Moisture resistance
1
Peak noise
Quarterly
Subgroup 3  2/
12 6 highest
Rotational life
6 lowest
Peak noise
Terminal strength
Semiannually
Subgroup 1
12 6 highest
Resistance to soldering heat 1/
6 lowest
High temperature exposure 2/
Peak noise  2/
1
Integrity of shaft 1/
Semiannually
Subgroup 2 2/
12 6 highest
Low temperature operation
6 lowest
Shock (specified pulse)
Vibration, high frequency
Semiannually
Subgroup 3 1/
0
3 any value
Resistance to solvents
1/ If the manufacturer can demonstrate that this test has been performed for five consecutive times
with zero failures, the frequency of this test, with the approval of the qualifying activity, can be
performed on an annual basis. If the design, material, construction, or processing of the part is
changed, or if there are any quality problems or failures, the qualifying activity may require
resumption of the original test frequency.
2/ If the manufacturer can demonstrate that these tests has been performed for five consecutive times
with zero failures, these tests, with the approval of the qualifying activity, can be deleted. The
manufacturer however, shall perform these tests every three years after the deletion as part of long
term design verification. If the design, material, construction, or processing of the part is changed,
or if there are any problems, the qualifying activity may require resumption of the specified testing.
Deletion of testing does not relieve the manufacturer from meeting the test requirement in case of
dispute.
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