MIL-DTL-5589E
4.5.1.3.2 Disposition of sample units. Sample units which have passed all the group B inspection may
be delivered on the contract or purchase order, if the lot is accepted and the sample units are still within
specified electrical tolerances.
4.5.2 Periodic inspection. Periodic inspection shall consist of group C inspection.
4.5.2.1 Group C inspection. Group C inspection shall consist of the examinations and tests specified
in table VII, in the order shown. Group C inspection shall be made on sample units selected from
inspection lots which have passed the group A and group B inspections.
4.5.2.1.1 Sampling plan. Four sample units shall be selected from each two-months production, or
each 1,000 units (whichever occurs first), after date of notification of first article.
TABLE VII. Group C inspection.
Inspection
Requirement
Test method
Number of sample
paragraph
paragraph
units to be
inspected
Subgroup 1
Endurance
3.4.6
4.6.7
2
Subgroup 2
3.2.5
4.6.15
Fungus resistant
4.6.8
2 for the
3.4.7
Moisture resistance
3.3, 3.5, 3.6
4.6.1
subgroup
Visual and mechanical
examination
4.5.2.1.2 Failures. If one or more sample units fail to pass group C inspection, the sample shall be
considered to have failed.
4.5.2.1.3 Disposition of sample units. Sample units which have been subjected to group C inspection
shall not be delivered on the contract or purchase order.
4.5.2.1.4 Noncompliance. If a sample fails to pass group C inspection, the supplier shall take
corrective action on the materials or processes, or both, as warranted, and on all units of product which
can be corrected and which were manufactured under essentially the same conditions, with essentially
the same materials, processes, etc., and which are considered subject to the same failure. Acceptance
of the product shall be discontinued until corrective action, acceptable to the Government, has been
taken. After the corrective action has been taken, group C inspection shall be repeated on additional
sample units (all inspection, or the inspection which the original sample failed, at the option of the
Government). Group A and group B inspections may be reinstituted; however, final acceptance shall be
withheld until the group C
reinspection has shown that the corrective action was successful. In the event of failure after
reinspection, information concerning the failure and corrective action taken shall be furnished to the
cognizant inspection activity.
4.6 Methods of examination and test.
4.6.1 Visual and mechanical examination. Earphones shall be examined to verify that the design,
physical dimensions, weight, marking, and workmanship are in accordance with the applicable
requirement (see 3.3, 3.5 and 3.6).
4.6.2 Frequency response (see 3.4.1). The earphone shall be mounted as shown in the test circuit
(see figure 2). Adjust the output from the audio oscillator to 1.1 volts ring at 1,000 Hz as measured by
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