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MIL-PRF-39017 Resistors, Fixed, Film \(Insulated\), Nonestablished Reliability, And Established Reliability, General Specification ForThis specification covers the general requirements for nonestablished reliability \(non-ER\) and established reliability \(ER\), insulated, film, fixed resistors. These resistors are capable of full load operation at an ambient temperature of 70 Degrees C and have a resistance temperature characteristic of 100 parts per million \(PPM\) and 350 PPM per degree Celsius \(PPM/Degrees C\). 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. Designers are CAUTIONED on using these resistors in high power pulse applications \(see 6.13.2\).

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MIL-PRF-39017G
4.7 Periodic group C inspection (ER only). Periodic inspection shall consist of group C inspection tests
specified in table XIV, in the order shown. They shall be performed on sample units selected from lots
that have passed the group A and group B inspections. Except where the results of these inspections
show noncompliance with the applicable requirements (see 4.7.6), delivery of products which have
passed group A and group B inspections shall not be delayed pending the results of these periodic
inspections.
TABLE XIV. Group C inspection.
Inspection
Requirement
Method
Number of
Number of
paragraph
paragraph
samples
defectives
Monthly
Subgroup 1
See 4.7.2
Life
Monthly
Subgroup 2
1/
Thermal shock
1
10
Resistance to soldering heat
Moisture resistance
Quarterly
Subgroup 1  1/
10
Shock (specified pulse)
Vibration, high frequency
1
Quarterly
Subgroup 2 2/
Dielectric withstanding voltage
Insulation resistance
10
Low temperature storage
Low temperature operation
Terminal strength
Semiannually 2/
High temperature exposure
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1
1/ If the manufacturer can demonstrate that these tests have 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.
2/ 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.
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