MIL-DTL-25038 Wire, Electrical, High Temperature, Fire Resistant, And Flight CriticalThis specification covers insulated single wire for electrical use in flight critical circuits and under short-time emergency conditions involving exposure to flames with temperatures up to 2,000 degrees F \(see 6.1\).

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MIL-DTL-25038J

SAE INTERNATIONAL

SAE J1966

Lubricating Oil, Aircraft Piston Engine (Nondispersant Mineral Oil)

SAE AS1241

Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft

(Copies of these documents are available online at from https://www.sae.org or from the SAE

International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.)

2.4 Order of precedence. 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 sheets. In the event of any conflict between requirements of

this specification and the specification sheet, the latter shall govern.

3.2 Qualification. Wires furnished under this specification shall be products that are authorized by

the qualifying activity for listing on the applicable qualified products list before contract award (see

3.3 Materials.

3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or

environmentally preferable materials should be used to the maximum extent possible, provided that the

material meets or exceeds the operational and maintenance requirements, and promotes economically

advantageous life-cycle costs.

3.3.2 Conductor material. Strands used in the manufacture of conductors shall be in accordance

with ASTM B355, class 27, or ASTM B624 coated with 27% nickel by weight, as specified in the

applicable specification sheet.

3.3.3 Insulating materials.

3.3.3.1 Primary insulation. The primary insulation shall consist of a concentric layer of glass fibers,

ceramics, or layers of glass tape and tetrafluoroethylene tape, or a combination of materials capable of

withstanding 650�F for 100 hours, and shall meet resistance, voltage, current, and other requirements

specified herein or on the applicable specification sheet. Where fibrous primary insulation is used, the

material shall be thoroughly impregnated with a silicone resin or other suitable compound so applied that

it will not enter the strands of the conductor and affect good electrical contact. Asbestos shall not be

used.

3.3.3.2 Outer layer. The outer layer of the wire shall consist of a closely woven braid of glass fiber

impregnated with polytetrafluoroethylene (PTFE), extruded PTFE, or tape-wrapped and cured PTFE.

3.4 Design and construction.

3.4.1 Conductors.