MIL-DTL-28791C
TABLE I. Materials inspection.
Material
Requirement
Applicable
paragraph
specification
Copper alloy
Aluminum alloy
Rubber
4.4 First article inspection.
4.4.1 Samples. First article inspection shall be performed by the supplier, after award of the contract and prior to
production, at a location acceptable to the Government. First article inspection shall be performed on sample units
that have been produced with equipment and procedures normally used in production. First article approval is valid
only on the contract or purchase order under which it is granted unless extended by the Government to other
contracts or purchase orders.
4.4.2 Sample size. Two isolators and/or two circulators shall be subjected to the first article inspection.
4.4.3 Inspection routine. The first article samples shall be subjected to the inspection specified in table I and table
II.
TABLE II. First article inspection.
Requirement
Test method
Examination or test
paragraph
paragraph
Visual and mechanical examination..............................................
3.13 and 3.14
Dielectric withstanding voltage 1/.................................................
Isolation.........................................................................................
Insertion loss.................................................................................
VSWR ...........................................................................................
Shock (specified pulse) .................................................................
Thermal shock .............................................................................
Moisture resistance .......................................................................
Vibration, high frequency ..............................................................
1/ Coaxial type circulators only.
4.4.4 Failures. One or more failures shall be cause for refusal to grant first article approval.
4.5 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.
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and group B
inspections.
4.6.1.1 Inspection lot. An inspection lot shall consist of all isolators or all circulators of one type produced under
essentially the same conditions, and offered for inspection at one time.
4.6.1.2 Group A inspection. Group A inspection shall consist of the examinations and test specified in table III in
the order shown.
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