MIL-PRF-29504/4D
Environmental. The following environmental tests shall be performed in the sequence listed: thermal
shock, temperature life.
Thermal shock. The temperatures of -55°C +0°C, -5°C and 165°C +5°C, -0°C shall be used for the
low and high soak temperatures, respectively. Mated connector assemblies shall be tested in
accordance with TIA/EIA-455-71, schedule C-0 (5 cycles). The mated connector assemblies shall
not be un-mated then re-mated after the test as part of the inspection. The change in optical
transmittance shall be measured during (towards the end of each soak temperature) and after the
test. The termini shall be visually examined after the test only if optical performance is not met.
Termini shall not be damaged, and there shall be no loosening of parts, separation of bonded
surfaces or other damage detrimental to the operation of the termini. The requirement for the
change in optical transmittance shall be met during and after the test.
Temperature life. The high exposure temperature shall be 165°C +5, -0°C. Mated connector
assemblies shall be tested in accordance with TIA/EIA-455-4 for the duration of 1,000 hours at the
high exposure temperature. The change in optical transmittance shall be measured after the test.
The termini shall be visually examined after the test to the extent feasible inside the connector.
Termini shall not be damaged, and there shall be no loosening of parts, separation of bonded
surfaces or other damage detrimental to the operation of the termini. The requirement for the
change in optical transmittance shall be met after the test. Performance of a cable/fiber retention
test is not required as part of the final inspection for this test.
Insertion loss (verification): If the cut back method is used after the mechanical or environmental tests
are concluded, then return loss may be performed prior to the insertion loss verification.
Qualification connector: The qualification connector for this terminus shall be a qualified MIL-DTL-
38999 connector.
Qualification by similarity.
a.
Qualification of termini for single mode fiber sizes.
(1)
Qualification inspection shall be performed on termini with a ferrule hole diameter of 126
microns when termini with both 125 (or 125.5) and the 126 micron ferrule hole diameters
are offered. Manufacturers who qualify under this specification sheet for the 126 micron
ferrule hole diameter are qualified under this specification sheet for the 125 or 125.5
micron ferrule diameter. Qualification inspection shall be performed on the 5.8/125 micron
fiber size.
(2)
Constraint for qualification by similarity case listed above. This qualification by similarity
case is valid if the only difference between the qualified termini (single mode 126 micron)
and the smaller size termini is a change in the terminus ferrule hole diameter and TICC
markings.
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