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MIL-DTL-55668 Cord, Electrical; Audio, Subminiature \(Retractile And Straight\)This specification covers subminiature audio helical retractile cords and straight cords with either stranded wire or tinsel wire conductors, for accessories associated in for the use with microphone, telephone, switchboard, and associated communication equipment. These cords are intended for operations at audio frequencies and temperatures from -55 Degrees C to +85 Degrees C with a high degree of flexibility. Each retractile cord is designed for extension in normal service up to 6 times its nominal retracted helical length.

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MIL-DTL-55668D

3.11 Pure tin. The use of pure tin is prohibited both internally and externally. Tin content of cable

components and solder shall not exceed 97 percent. Tin shall be alloyed with a minimum of 3 percent

lead by mass (see 6.9).

4. VERIFICATION

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

a. First article inspection (see 4.5).

b. Conformance inspection (see 4.6).

4.2 Requirements cross-reference matrix. Table IV provides a cross-reference matrix of the section 3

requirements tested or verified in the paragraphs below.

TABLE IV. Requirements cross-reference matrix.

Requirement paragrah

Verification paragraph

Requirement paragraph

Verification paragraph

4.7.1, 4.7.3, 4.7.3.1,

4.7.1, 4.7.3, 4.7.3.1,

3.6.2

4.7.1, 4.7.6, 4.7.6.1

4.7.4

3.3.1

4.7.1, 4.7.4, 4.7.4.1,

4.7.1

4.7.4.2

3.3.2

4.7.1, 4.7.4, 4.7.4.1,

4.7.4.2

3.3.3

4.7.1, 4.7.3, 4.7.3.1,

3.8

4.7.1, 4.7.7, 4.7.7.1,

4.7.3.2, 4.7.4, 4.7.4.1,

4.7.7.2, 4.7.7.3, 4.7.7.4,

4.7.4.2

4.7.8, 4.7.10, 4.7.11,

4.7.12, 4.7.13, 4.7.13.1,

4.7.13.2, 4.7.13.3,

4.7.14, 4.7.15, 4.7.16,

4.3 Inspection equipment and facilities. Inspection equipment and facilities shall be established and

maintained. ISO 10012-1 and NCSL Z540.3 or comparable standards are available as guidance.

4.4 Materials inspection. Materials inspection shall consist of certification supported by verifying data

that the materials specified in table V, used in fabricating subminiature cords, are in accordance with the

applicable referenced specification or requirements prior to such fabrication.