MIL-PRF-39009E
4.6.3 Group A inspection.
4.6.3.1 Non-ER resistors. The manufacturer shall establish and maintain an inspection system to verify
that resistors meet dc resistance, visual/mechanical, and solderability requirements. In-line or process
control may be part of such system. The inspection system shall also include criteria for lot rejection and
corrective actions. The inspection system shall be verified under the overall MIL-STD-790 QPL system.
NOTE: Since the non-ER (C level) is the ER design without the mandatory conformance inspection and
FR level assessment, this product is still expected to meet the environmental qualification type
requirements such as moisture resistance, shock, and vibration.
4.6.3.2 ER resistors. Group A inspection shall consist of the inspections specified in table VI, in the
order shown.
TABLE VI. Group A inspection (ER only).
Requirement
Test method
Sampling
Inspection
paragraph
paragraph
procedure
Subgroup 1 1/
100 percent
Conditioning
inspection
DC resistance 2/
Subgroup 2
Visual examination
Material
Interface and physical dimension
Marking 3/
See 4.6.3.2.3
Soldering
Workmanship
Subgroup 3
Solderability 4/
See 4.6.3.2.4
1/ At the manufacturer's option, the determination of resistance change may be by
any method which is within the accuracy requirements of this specification.
2/ Resistors shall meet the specified initial resistance tolerance after being
subjected to the preceding test.
3/ With the approval of the qualifying activity radiographic inspection can be
conducted during production anytime after complete enclosure of the element.
4/ The manufacturer may request the deletion of the subgroup 3 solderability test,
provided an in-line or process control system for assessing and assuring the
solderability of leads can be validated and approved by the qualifying activity.
Deletion of the test does not relieve the manufacturer from meeting this test
requirement in case of dispute. If the design, material, construction, or
processing of the part is changed or if there are any quality problems, the
qualifying activity may require resumption of the test.
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