MIL-PRF-87260B(USAF)
3.2.4 Manufacturer internal specification and production quality control documents.
The conductive material manufacturer shall provide adequate internal documents
(specifications/manuals) to define and control the production, testing, and quality control of the
material. The qualification documentation shall include, as a minimum, the manufacturer's
quality control manual and internal specification that describe such items as: manufacturer's
product, product part numbers, available bun sizes, production testing and frequency of the
production tests, testing requirements (limits), quality control procedures, and any other
information relative to the materials' certification or usage. This document(s) shall be made
available for use by the Government personnel during production facility inspections and during
material procurement certification. The vendor's quality control document(s) should also be
referenced in the product qualification report and a copy provided to the qualifying agency as
part of the qualification package.
3.3 Age.
The maximum time of delivery from the manufacturer shall not exceed one year. If the time
since manufacture exceeds six months, the material shall be visually inspected, and there shall
be no evidence of discoloration resulting in surface deterioration that results in a loss of tension
properties. Discoloration of urethane foams with age and exposure to ultraviolet light is a
normal occurrence and does not necessarily indicate deterioration.
3.3.1 Storage life.
The storage life of the material covered by this specification shall be three years from the date
of manufacture, provided it is maintained in the original sealed polyethylene bag plus opaque
overwrap at temperatures below 90 degrees Fahrenheit (°F). Storage should be in an area out
of direct sunlight and outside weather, including high humidity and temperature. The material
should be inspected for evidence of discoloration or surface deterioration (loss in tensile
properties) prior to use.
3.3.2 Storage limit.
Material that exceeds the three-year storage limit shall be re-certified by the manufacturer or
other competent test group that the material has not been deteriorated or contaminated.
3.4 Coloring pigments.
Coloring pigments shall not be readily extractable when the conductive material is used in
contact with fuels conforming to MIL-DTL-5624, MIL-DTL-83133, and ASTM D1655. Product
color is not limited except that it shall not be blue, orange, yellow, or red. The preferred color is
charcoal grey.
3.5 Marker legibility.
The manufacturer shall identify a suitable marker for use on the conductive material kit pieces
(individual identification numbers) to be installed in the aircraft fuel system. The marker shall be
compatible with both fuel and the conductive material. A possible source for a fuel compatible
marking ink is A-A-208.
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