MIL-PRF-85725A(AS)
TABLE I. Environmental conditions.
Equipment
Equipment operating
operating and
Equipment nonoperating
nonoperating
Temperature extremes for
Temperature
Temperature
Temperature
the chamber (without
Combined temperature-
shock
Altitude
extremes
shock
external cooling provisions)
altitude
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
Continuous
Intermittent
Continuous
Intermittent
Range
Range
Range
Range
-54 °C
-54 °C
-57 °C
-57 °C
30 min
Defined by
Defined by
Sea level
+95 °C
(-65 °F)
(-65 °F)
(-71 °F)
(-71 °F)
curve A,
curve B,
(30.0 in. Hg.)
(+203 °F)
figure 2
Figure 2
(1.32 in. Hg.)
to
to
to
to
+71 °C
+95 °C
+95 °C
+95 °C
70,000 ft.
(+203°F)
(+160 °F)
(+203 °F)
(+203 °F)
3.4.1.1 High temperature. The rack shall not bind, crack, craze, discolor, or bulge and the
gaskets shall not lose their resiliency or become permanently distorted when tested as specified in
4.5.2.1. The operational requirements (temperature vs. altitude) are shown in figure 2. The
performance of the vibration isolators shall not degrade.
3.4.1.2 Low temperature. The rack shall not bind, crack, craze, discolor, or bulge and the
gaskets shall not lose their resiliency or become permanently distorted when tested as specified in
4.5.2.2. The performance of the vibration isolators shall not degrade.
3.4.1.3 Temperature shock. The rack shall withstand the temperature shock test as specified
in 4.5.2.3 with no physical or performance degradations.
3.4.1.4 Humidity. The rack shall withstand the humidity test as specified in 4.5.2.4 with no
change in mechanical properties, absorption of water, swelling, corrosion, or deterioration in
performance.
3.4.1.5 Fungus. Racks covered by this specification shall be constructed of materials which
are non-nutrient materials for biological growth. The rack shall pass the test of 4.5.2.5 without
any degradation in performance (see 6.9).
3.4.1.6 Salt fog. The rack shall withstand the salt fog test as specified in 4.5.2.6 with no
corrosion, deterioration, or performance degradation.
3.4.1.7 Acceleration. The rack shall withstand the acceleration test as specified in 4.5.2.7
with no material yield, failure, or loss of joint integrity.
3.4.1.8 Vibration. The rack shall withstand the vibration test as specified in 4.5.2.8 with no
material yield, failure, or loss of joint integrity. In addition, the transmissibilities of the mounting
system shall be not greater than the values shown on figure 3 in any direction of vibration.
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