MIL-DTL-5794C
4.4 Conformance inspection.
4.4.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A,
group B, and group C inspections, as specified in table IV.
4.4.1.1 Inspection lot. An inspection lot shall consist of all products of the same type, produced under
essentially the same conditions, and offered for inspection at one time.
4.4.2 Group A inspection. Group A inspection shall consist of 100 percent of each lot. If one or more
defects are found, the defective microphone unit(s) shall be removed. All failures occurring during testing
shall be documented and investigated to determine root cause. Acceptance of the product shall be
discontinued until corrective action, which is acceptable to the procuring activity, has been taken. After
the corrective action has been taken, the group A inspections shall be repeated (all inspections, or the
inspection which originally failed, at the option of the procuring activity). Approval shall be withheld until
the inspection has shown that the corrective action was successful. If one or more defects are found
during the second inspection, the lot shall be rejected and shall not be supplied to this specification.
TABLE IV. Conformance inspection.
Inspection
Requirement
Inspection
paragraph
paragraph
Group A
Visual and mechanical
Response measurements (spot check)
Microphone unit resistance
Group B
Response measurements
(Continuous check)
Signal to noise ratio
Burning noise
Group C
Position characteristics
Temperature cycling
Immersion
Impact
4.4.3 Group B inspection. Group B inspections shall be as specified in table IV and shall be made on
samples, which have been subjected to and have passed group A inspection.
4.4.3.1 Order of inspection within group B. Group B inspections shall be performed in any order, which
is satisfactory to the Government inspector.
4.4.3.2 Sampling plan. A sample of parts shall be randomly selected, as specified in table V. If one or
more defects are found, the lot shall be rescreened and defects removed. All failures occurring during
testing shall be documented and investigated to determine root cause. Acceptance of the product shall
be discontinued until corrective action, which is acceptable to the procuring activity, has been taken.
After corrective action has been taken, a new sample of parts shall be randomly selected, as specified in
table V, and the group B inspection repeated. If one or more defects are found in the second sample, the
lot shall be rejected and shall not be supplied to this specification.
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