G. This Headset-Microphone Kit is designed to fit both the regular and large size Combat Vehicle Crewman\'s Helmet. The electrical characteristics of the kit are compatible with Tactical Radio Systems, such as the VRC-12.

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MIL-DTL-55535A

3.8.7 Vibration (see 4.13.7). The amplitude of vibration of any part, sub-assembly, or structural

member of the equipment shall not exceed twice the amplitude of the vibration applied to the equipment

at any frequency between 10 and 55 Hz. Tests of the earphone element and the microphone element

shall be made to determine compliance with 3.6.1 and 3.7.1, respectively, prior to, and after the cycling.

Upon completion of the vibration test, the equipment shall exhibit no evidence of loosening of parts or

other mechanical damage and shall meet full specification requirements.

3.8.8 Bounce. The equipment shall meet specified performance, with no physical damage allowed,

after being subjected to the test of 4.13.8. At the conclusion of the test, the equipment shall meet the

requirements of 3.6.1 and 3.7.1, with degradation not to exceed 3 dB.

3.8.9 Shock drop. The equipment shall be operable after the test of 4.13.9. Any physical damage

shall be minor only.

3.9 Switch life. The switch shall continue to operate properly following 100,000 complete cycles of

operation, when tested as specified in 4.12.

3.10 Cord assemblies. Cord assemblies shall be as specified in MIL-C-3885. The earphone cords,

CX-10454/G shall be 2 (two) conductor stranded WD-27A/U and shall meet the requirements of MIL-C-

10392. The upper cord set, CX-10453/G shall be five-conductor tinsel with one microphone lead

shielded. Cord set CX-8650B/G shall be constructed as specified in drawing SM-D-436079.

3.10.1 Cord dielectric strength and insulation resistance. The end item equipment specified shall be

tested (see 4.14). During the test there shall be no evidence of insulation breakdown and at the

conclusion of the test, the insulation resistance shall not have decreased to a value below 1 megohm.

3.11 Operational requirement. Units shall be tested, as indicated in 4.9. The unit under test shall

perform in accordance with all requirements of this specification.

3.12 Interchangeability. Like units, assemblies, subassemblies, and replaceable parts shall be

physically and functionally interchangeable without modification of such items or of the equipment (see

4.11). Individual items shall not be hand-picked for fit or performance. Reliance shall not be placed on

any unspecified dimension, rating, characteristic, etc. Non-interchangeability of these parts constitutes

failure.

3.13 Preconditioning. The equipment shall be capable of meeting the requirements herein, without

subsequent processing, after subjection to the bounce preconditioning of 4.6 (also see 4.5).

3.14 Workmanship (see 4.10). The equipments shall be manufactured and assembled in accordance

with the applicable portions of 3.3.1 and 3.3.2:

4. VERIFICATION

4.1 Classification of inspection. The inspection requirements specified herein are classified as follows:

a. First article inspection (see 4.3).

b. Inspection covered by subsidiary documents (see 4.4).

c. Conformance inspection of equipment (see 4.5).