MIL-DTL-18266C
MIL-DTL-18307 - Nomenclature and Identification for Aeronautical Systems Including Joint
Electronics Type Designated Systems and Associated Support Systems
(Copies of these documents are available online at https://quicksearch.dla.mil or from the Document
Automation and Production Service (DAPS) Standardization Document Order Desk, 700 Robbins
Avenue, Building 4D, Philadelphia, PA 19111-5094.)
2.3 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, 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 Qualification. Cords furnished under this specification shall be products that are authorized by
qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and
6.4).
3.2 Parts, materials and processes. Parts, materials and processes shall be as specified herein.
However, when definite parts, materials, and processes are not specified, parts, materials and processes
shall be used, which will enable the cord to meet all the requirements of this specification. Acceptance or
approval of any constituent parts, materials, and processes shall not be construed as a guarantee of the
acceptance of the finished product (see 6.7).
3.2.1 Fungus and moisture resistant materials. Materials which are not nutrients for fungi and moisture
resistant shall be used.
3.2.1.1 Central cords, fillers, binders, etc. All cotton or other textiles used as a central core, filler,
binder, etc. shall be fungus treated prior to their use. The impregnating material shall not affect the
electrical or physical characteristics of the cordage.
3.2.2 Cordage. The insulation and jacket compounds shall be in accordance with MIL-DTL-10392
homogenous in character, tough and elastic. The resultant cordage shall be free from blisters, cracks
and other imperfections, which would affect the serviceability.
3.2.2.1 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and
externally. Tin content of cord assembly components and solder shall not exceed 97 percent, by mass.
Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.5.1).
3.3 Design and construction.
3.3.1 Jacket. The jacket shall provide long life under severe service conditions. The jacket shall have
a minimum thickness of 0.020 inch and shall not adhere or stick to the conductor insulation. The finished
cordage shall have a reasonably smooth surface.
3.3.1.1 Stripping. Irregularities in the jacket edge due to stripping shall not exceed 0.1875 (3/16) inch
(4.76 mm) overall.
3.3.2 Conductor. Each stranded conductor shall be equivalent to 404 circular mils (# 24 AWG) and
shall consist of 41 strands of # 40 AWG bunched stranded with a lay of no more than 0.6 inch.
3.3.2.1 Conductor resistance. The resistance of the individual conductor of the finished cordage shall
not exceed 0.04 ohm per foot at a temperature of 20 degrees C.
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