MIL-DTL-5794C
IPC - ASSOCIATION CONNECTING ELECTRONICS INDUSTRIES
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Requ ir em en t s f or Solder in g Flu x es
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Requ ir em en t s f or Solder in g Past es- Replaces QQ- S- 5 7 1 : 1 9 9 4 ;
Am en dm en t 1 - Ju n e 1 9 9 6
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Requirements for Electronic Grade Solder Alloys and Fluxed and
Non-Fluxed Solid Solders for Electronic Soldering Applications.
(Copies of these documents are available from https://www.ipc.org or IPC - Association Connecting
Electronics Industries, 3000 Lakeside Drive, Suite 309 S, Bannockburn, IL 60015-1249.)
2.4 Order of precedence. 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 General. Unless otherwise stated herein, the term "microphone unit" is taken to mean either
Microphone Unit M-6A/UR or Carbon Microphone M-51/UR.
3.2 First article. When specified (see 6.2), a sample shall be subjected to first article inspection, in
accordance with 4.3.
3.2.1 Fabrication and assembly. First article samples shall be fabricated by the contractor and shall
meet all requirements specified for the equipment on contract. The first article samples shall be
assembled using parts, materials, and processes that will be employed in production, and shall be
fabricated and assembled in a manner similar to that to be used in production.
3.2.2 Approval and use. Approval of first article samples shall not be construed as a waiver of any
specified requirement. After being released to the contractor (see 3.2.3), first article samples, which are
to be offered as units on a contract, shall be refabricated by the contractor, if necessary to meet specified
requirements.
3.2.3 Reference standards. After first article samples have been approved, they shall be kept intact in
custody of the Government inspector until released by him. They shall be used as reference standards to
resolve any differences of opinion regarding interpretation of requirements.
3.3 Parts, materials, and processes; general. Parts, materials, and processes shall be such as to
enable the microphone unit to meet its performance and other requirements as specified herein. Ratings
and derated values of parts and materials shall not be exceeded, when the microphone unit is subjected
to specified service conditions (see 3.6).
3.3.1 Molded plastic material. All molded plastic parts shall be of the high temperature, high impact,
and resistant plastic material, which shall meet the service requirements of the specification.
3.3.2 Steel parts. Steel parts shall be zinc-plated in accordance with ASTM B633, with thickness class
Fe/Zn 25 and finish type II.
3.3.3 Exposed non-ferrous parts. Parts that are exposed after the microphone unit is assembled shall
be thoroughly cleaned, followed by a preventive coating in accordance with DOD-P-15328. This shall be
followed by two coats of a high quality alkyd, semi-gloss, black enamel.
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