MIL-DTL-9129G
RADIO TECHNICAL COMMISSION FOR AERONAUTICS
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Environmental Conditions and Test Procedures for Airborne Equipment.
(Copies of this document are available online at https://www.rtca.org/ or from the Radio Technical Commission for
Aeronautics, RTCA, Inc., 1828 L Street, NW, Suite 805, Washington, DC 20036, Tel: 202-833-9339, Fax: 202-833-
9434).
SOCIETY OF AUTOMOTIVE ENGINEERS
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Fluid, Generic, Deicing/Anti-Icing Runways and Taxiways.
(Copies of these documents are available online at https://www.sae.org/ or from the Society of Automotive
Engineers, 400 Commonwealth Drive, Warrendale, PA 15096-0001.)
2.4 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 (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 sheets, the latter shall govern.
3.2 First article inspection. When specified, dischargers furnished under this specification shall be a product which
has been tested and passed all applicable inspections specified in 4.4.
3.2.1 Information to be furnished with sample. The applicable information, outlined in 6.3, shall be furnished with
the sample together with any other pertinent information as required by the Government.
3.3 Selection of specifications and standards. Specifications and standards for necessary items not specified
herein shall be selected to meet the requirements of this specification. Commercial items having suitable properties
may be used where no military standard parts exist for the same purpose.
3.4 Materials. Materials shall be as specified herein and the applicable specification sheet (see 3.1). Materials
that are not specifically designated shall be inherently fungus resistant and possess such other overall characteristics
as to provide for the furnished discharger to meet the requirements of this specification. Acceptance or approval of
any constituent material shall not be construed as a guarantee of the acceptance of the finished product.
3.4.1 Metals. All metals used in the construction of the dischargers covered by this specification shall be corrosion
resistant or protectively treated to resist corrosion in consonance with the performance requirements specified herein.
When dissimilar metals are used in contact with each other, protection against electrolysis and corrosion shall be
provided. Metal plating or metal spraying of dissimilar base metals to provide similar or suitable abutting surfaces is
permitted. Dissimilar metals are defined in MIL-STD-889.
3.4.2 Pure tin: The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of discharger 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).
3.4.3 Nonmetalic materials. Nonmetallic materials and coatings shall not crack, chip, or otherwise deteriorate
under temperature extremes, vibration, shock, and moisture conditions. Current carrying, nonmetallic materials shall
provide permanent conductivity to the degree that will assure that the complete discharger meets the requirements of
this specification.
3.5 Design and construction. Dischargers covered by this specification shall be of the design, construction, and
physical dimensions specified herein and in the individual specification sheet (see 3.1).
3.5.1 Mounting. The type of mounting shall be as specified in the individual specification sheet (see 3.1).
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