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| MIL-T-81290(WP)
4.4.2 Low Temperature. The Test Set, not energized and with the
cover in place and latched, shall be placed within a suitable test chamber
and the chamber temperature lowered to minus 65 plus 0 minus 5 degrees F.
The chamber shall remain at this temperature for not less than eight hours
after which the temperature shall be raised to plus 35 plus 0 minus 5 de-
grees F, the cover removed and the temperature stabilized at plus 35 plus 0
minus 5 degrees F for six hours. The Test Set shall then be energized. The
Test Set shall meet all performance and product characteristics of this spec-
ification while maintained at the temperature of plus 35 plus 0 minus 5 de-
grees F.
4.4.3 Humidity. With the cover removed for the first three cycles
(24 hours ) the Test Set shall be subjected to the humidity test, Procedure I
Specification MIL-E-5272. The cover shall then be put in place and latched
for the remainder of the tests and thereafter the Test Set shall meet the per-
formance and product characteristics of this specification.
4.4.4 Fungus. The Test Set, with the cover in place and latched,
shall be subjected to the fungus test, Procedure I, Specification MIL-E-5272
and thereafter meet the performance and product characteristics of this
specification.
4.4.5 Sand and Dust. With exception that the air velocity shall be
between 100 and 500 feet per minute, the Test Set, with cover removed, shall
be subjected to the sand and dust test, Procedure III, Specification MIL-E-5272
and thereafter meet the performance and product characteristics of this spec-
ification.
4.4.6 Salt Spray. With the cover removed for the first phase (48 hours),
the Test Set shall be subjected to the salt spray test, Procedure I, Spec-
ification MIL-E-5272. The cover shall then be put in place and latched for
the remainder of the test and thereafter the Test Set shall meet the perform-
ance and product characteristics of this specification.
4.4.7 Rain. The Test Set, with cover removed, shall be subjected to
the rain test, Procedure II, Specification MIL-E-5272 and thereafter meet the
performance and product characteristics of this specification.
4.4.8 Shock. The Test Set, with the cover in place and latched, shall
be subjected to 18 impact shocks of 15g acceleration, each shock impulse
having a time duration of 11 plus or minus 1 millisecond. The intensity
shall be within plus or minus 10 percent when measured with a filter having a
band width of 5 to 100 cycles per second, The maximum acceleration shall be
reached in approximately 5-1/2 milliseconds. The shock shall be applied in the
following directions:
a. Vertically, 3 shocks in each direction.
b. Parallel to the major horizontal axis, 3 shocks in each direc-
tion.
14.
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