MIL-DTL-5589E
3.4.13 Acoustic quality. When earphones are tested as specified in 4.6.14, there shall be no buzzing
rattling, nor other spurious sounds in the acoustic output of the earphone.
3.5 Marking. Earphones shall be marked in accordance with MIL-STD-130 with the type designation
and manufacturer's code symbol or name.
3.6 Workmanship. Earphones shall be processed in such a manner as to be uniform in quality and
shall be free from loose parts, excess solder, sharp edges, burrs, flaking, scratches, peeling, metal chips
and foreign material. Soldering, impregnation of coils, plating, staking, riveting, and machine screw
assemblage shall be neat and thorough. The coil shall be centered properly, void of foreign objects in
the air gap and shall not drag on the frame or magnet.
3.7 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.
4. VERIFICATION
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4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. First article inspection (see 4.4).
b. Conformance inspection (see 4.5).
4.2 Test equipment and inspection facilities. The supplier shall establish and maintain a calibration
system in accordance with ANSI/NCSL Z540-1.
4.3 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 and
MIL-STD-810.
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 sample units which 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 (see 6.3).
4.4.1 Sample size. Six earphones shall be subjected to the first article inspection.
4.4.2 Inspection routine. The sample shall be subjected to the inspections specified in table II, in the
order shown. All sample units shall be subjected to the inspections of group I. The sample shall then be
divided equally into two groups of three units each, three shall be subject to group II and three shall be
subject to group III.
4.4.3 Failures. A single failure of any test in table II shall be cause for refusal to grant first article
approval.
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