MIL-DTL-24223D(SH)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between
the text of this document and the references cited herein (except for related specification sheets), the text of this
document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless
a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with
the applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern.
3.2 First article. When specified (see 6.2), three sample units shall be tested as specified, except for LS-
397()/SIC. For the LS-397()/SIC, one complete sample and one loudspeaker assembly, minus rotatable base, shall
be tested as specified in 4.2.
3.3 Description. See the specification sheets.
3.4 General requirements. The loudspeaker shall be in accordance with the following requirements when tested
in accordance with 4.5.1, in addition to the requirements specified herein.
3.4.1 Fungus. Materials shall be in accordance with guideline 4 of MIL-HDBK-454, and should follow the
guidance in accordance with the paragraph titled "Fungus testing" of MIL-HDBK-454, if not inert. Inert materials
are listed in table 4-1, group 1, of MIL-HDBK-454.
3.4.2 Other materials. The following materials shall not be used unless specifically authorized: mercury,
radium, magnesium, and ceramics.
3.4.3 Ferrous alloys. Ferrous alloys shall be in accordance with MIL-STD-889. Where enclosures, cases,
frames, panels, brackets, and miscellaneous hardware are fabricated of steel, such materials shall be treated to
prevent corrosion.
3.4.4 Gaskets. For square or rectangular enclosures, the inside radius of the O-ring at the corners of the
enclosure shall be 0.19 inch minimum. Gaskets shall be lubricated to prevent them from sticking to the enclosure.
3.4.5 Electrical tape. Fabric or textile pressure-sensitive (adhesive or friction) tape shall not be used.
3.4.6 Rounded corners and edges. Sharp edges and points of any kind shall be avoided.
3.4.7 Safety. Safety shall be in accordance with MIL-HDBK-454, guideline 1.
3.4.8 Insulation resistance. Insulation resistance shall not be less than 10 megohms at 50 volts direct current
(DC), at approximately room temperature, and at approximately 50 percent relative humidity. Insulation resistance
testing shall be conducted in accordance with 4.5.3.
3.4.9 Humidity. All units shall operate without mechanical or electrical damage at 149 °F (65 °C), with
relative humidity of 95 percent, when tested in accordance with paragraph 4.5.9.
3.5 Loudspeaker enclosure. The enclosure and horn shall be of the same material. Construction shall be of
aluminum conforming to alloy 5052, temper T4 of ASTM B209, alloy 6061, temper T4 of ASTM B209, or other
materials specifically approved by the procuring activity. Refer to the specification sheets for degree of enclosure,
enclosure construction requirements, and cable entrance requirements.
3.6 Dimensions and weight. The uncrated weight and overall dimensions (excluding stuffing tubes) shall not
exceed the value shown in the specification sheets.
3.7 Enclosure. Mounting dimensions for the enclosures and loudspeakers are identified in the specification
sheets.
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