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3-01This specification covers 2 \(two\) hand-held Dynamic Microphones, with or without a self-contained transistor amplifier and different connectors for use in unique military equipment. A wall-mounted holder is also included.

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MIL-DTL-21393B

6.2 Acquisition requirements. Acquisition documents should specify the following:

a. Title, number, and date of this specification and the associated specification sheet (see 2.2.1).

b. PIN (i.e., M21393/1-01,M21393/2-01, or M21393/3-01) (see 3.1).

c. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue of individual

documents referenced (see 2.2.1 through 2.3).

d. When first article is required, based upon contractor performance history. (see 3.2).

e. When the reliability test is required under the group B conformance inspections (see 4.5.1.3).

6.3 Service conditions. The microphone should operate satisfactorily under any of the environmental

and mechanical service conditions or reasonable combination of these conditions, as indicated in

MIL-HDBK-5400 for class 1B equipment, except that the requirements for sand and dust do not apply.

6.4 Environmentally preferable material. Environmentally preferable materials should be used to the

maximum extent possible to meet the requirements of this specification. Table IX lists the Environmental

Protection Agency (EPA) top seventeen hazardous materials targeted for major usage reduction. Use of

these materials should be minimized or eliminated, unless needed to meet the requirements specified

herein (see section 3).

TABLE IX. EPA top seventeen hazardous materials.

Benzene

Dichloromethane

Tetrachloroethylene

Cadmium and Compounds

Lead and Compounds

Toluene

Carbon Tetrachloride

Mercury and Compounds

1,1,1 - Trichoroethane

Chloroform

Methyl Ethyl Ketone

Trichloroethylene

Chromium and Compounds

Methyl Isobutyl Ketone

Xylenes

Cyanide and Compounds

Nickel and Compounds

6.5 Cross-reference. The new items in table X are fully substitutable and may be stocked with the old

items.

TABLE X. Cross-reference

Description

Old

New

Microphone

w/ amplifier

M92C/U

M21393/1-01

Microphone

w/o amplifier

20520332-1

M21393/2-01

Holder,

microphone

MT-2014/U

M21393/3-01

6.6 Subject term (key word) listing.

Amplifier

Connector

Cordage

Hand-held

Holder

Switch