MIL-PRF-49291D
3.7.5 Fluid immersion aging. When specified (see 3.1) and when tested in accordance with 4.8.5, after
removal of test specimens from the test fluid, the specimen shall meet all the requirements of 3.7.8.
3.7.6 Nuclear radiation resistance. When specified (see 3.1) and when tested in accordance with
3.7.7 Fungus resistance. When specified, and when tested in accordance with 4.8.7, polymeric fiber
materials shall show sparse or very restricted microbial growth and reproduction with minor or inhibited
substrate utilization. There shall be little or no chemical, physical, or structural change detectable.
the mean fracture strength after each period of aging shall be not less than 1.75 gigaPascals (GPa). The
initial mean fracture strength shall be not less than 3.2 GPa. The Weibull modulus shall be reported.
shall be no cracking or melting of the fiber coating material and the change in optical transmittance shall
not exceed the requirements of 3.6.1.
3.8 Identification marking. Unless otherwise specified in the acquisition document or in the
specification sheet (see 3.1), the identification shall be applied to either the outer surface of the fiber
spool or the outside of the container holding the fiber spool. Identification marking shall include indicators
of the military specification number, specification sheet number, military Part or Identifying Number (PIN),
manufacturer's code, and a four character date code indicating week and year. All markings shall be
permanent and legible. When specified (see 3.1 and 6.2), a colored coating of the optical fiber shall be
3.8.1 JAN and J marking. The United States Government has adopted, and is exercising legitimate
control over, the certification marks "JAN" and "J" respectively, to indicate that items so marked or
identified are manufactured to, and meet all the requirements of specifications. Accordingly, items
acquired to, and meeting all of the criteria specified herein and in applicable specifications shall bear the
certification mark "JAN" except that items too small to bear the certification mark "JAN" shall bear the
letter "J". The "JAN" or "J" shall be placed immediately before the part number except that if such
location would place a hardship on the manufacturer in connection with such marking, the "JAN" or "J"
may be located on the first line above or below the part number. Items furnished under contracts or
orders which either permit or require deviation from the conditions or requirements specified herein or in
applicable specifications shall not bear "JAN" or "J". In the event an item fails to meet the requirements of
this specification, and the applicable specification sheets or associated specifications, the manufacturer
shall remove completely the military part number and the "JAN" or the "J" from the sample tested and
also from all items represented by the sample. The "JAN" or "J" certification mark shall not be used on
products acquired to contractor drawings or specifications. The United States Government has obtained
Certificate of Registration Number 504,860 for the certification mark "JAN" and Registration Number
1,586,261 for the certification mark "J".
3.9 Workmanship (see 4.7.2). All details of workmanship shall be in accordance with high grade
optical fiber manufacturing practice. Fibers shall be dimensionally uniform, free of lumps, kinks, splits,
scraped or abraded surfaces and inclusions.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
Qualification inspection (see 4.5).
a.
b.
Conformance inspection (see 44.6).
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