MIL-DTL-3970F
4.2 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Materials inspection (see 4.3).
b.
First article inspection (see 4.5).
c.
Conformance inspection (see 4.6).
4.3 Materials inspection. Materials inspection shall consist of certification that the materials (see 3.3 through 3.3.3)
used in fabricating the assembly are in accordance with the applicable referenced specifications or requirements prior
to such fabrication.
4.4 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with
the test conditions specified in the "GENERAL REQUIREMENTS" of MIL-STD-202.
4.4.1 Equivalent test methods. The use of equivalent test methods is allowed provided it is demonstrated to the
acquiring activity or their agent that the equivalent test methods in no way relax the requirements of this specification
and that the equivalent test methods are approved by the acquiring activity for use by that manufacturer before
testing is performed (see 6.3.1).
4.5 First article inspection. First article inspection shall be performed by the manufacturer after award of contract
and prior to production at a location acceptable to the Government on sample units produced with equipment and
procedures normally used in production. This inspection consists of meeting all requirements of 4.5.1 through 4.5.4
inclusive and of table I. First article approval is valid only on the contract or purchase order under which it is granted.
TABLE I. First article approval inspection.
Requirement
Method
Inspection
paragraph
paragraph
Visual and mechanical inspection - - - - - - -
4.7.1
VSWR - - - - - - - - - - - - - - - - - - - - - - - - -
4.7.2
Insertion loss- - - - - - - - - - - - - - - - - - - - -
4.7.3
Pressurization- - - - - - - - - - - - - -- - - - - -
3.7
Salt atmosphere (corrosion)- - - - - - - - - - - - -
Vibration, high frequency - - - - - - - - - - - - -
Shock (specified pulse) - - - - - - - - - - - - - -
Power handling capability (when specified)-
4.5.1 Sample size. One each of the first article approval Part of Identifying Numbers (PIN) for which first article
approval is sought, shall be subjected to first article inspection.
4.5.2 Inspection routine. Sample units shall be subjected to the first article approval inspections specified in table
I, in the order shown.
4.5.3 Failures. One or more failures shall be cause for refusal to grant first article approval.
4.5.4 Disposition of first article sample units. Sample units which have been subjected to first article approval
testing shall not be delivered on any contract or purchase order. The Government reserves the right to retain the
same units or to require the manufacturer to furnish the sample units with the first article inspection report.
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and B
inspections.
4.6.1.1. Inspection lot. An inspection lot shall consist of all assemblies of the same military PIN produced under
essentially the same condition, and offered for inspection at one time.
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