MIL-DTL-28839B
3.16 Marking. The waveguide shall be marked in accordance with method I of MIL-STD-1285, with the PIN and
the manufacturer's source code. The manufacturer's name or trademark may also be marked on the waveguide,
provided such letters are not expressly forbidden in the contract. The marking shall be applied with a permanent ink
or paint along one side of the waveguide. Not more than 12-inch intervals shall be permitted from the end of one
marking to the beginning of the next marking.
3.17 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.18 Workmanship. The waveguide shall be free from defects of a nature that may interfere with normal military
applications. The waveguide shall be uniform in composition, free from internal and external mechanical
imperfections, and shall have a clean, bright appearance in accordance with good commercial practice. The interior
surface of the waveguide shall be free from burrs, die marks, dirt, grease, scales, and splinters.
4. VERIFICATION
4.1 Classification of inspections. The inspections specified herein are classified as follows:
a. Materials inspection (see 4.3).
b. First article inspection (see 4.4).
c. Conformance inspection (see 4.5).
4.2 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.
4.3 Materials inspection. Materials inspection shall consist of certification supported by verifying data that the
materials listed in table II, used in fabricating the waveguide, are in accordance with the applicable referenced
specifications or requirements prior to such fabrication.
TABLE II. Materials inspection.
Requirement
Applicable
Material
paragraph
specification
Aluminum alloy
Copper
Jacket
(see 6.6)
4.4 First article inspection. First article inspection shall be performed by the contractor, after award of contract and
prior to production, at a location acceptable to the Government. First article inspection shall be performed on a
sample unit which has been produced with equipment and procedures normally used in production. Unless extended
by the Government to other contracts, first article approval is valid only on the contract under which it is granted.
4.4.1 Sample size. One waveguide shall be subjected to first article inspection.
4.4.2 Inspection routine. The sample shall be subjected to the inspections specified in table III, in the order shown.
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