MIL-DTL-85670D
4.5.4.1 Temperature-altitude. The antenna shall be tested in accordance with MIL-STD-810 to verify conformance
with class I equipment requirements [50,000 feet altitude and continuous sea level operation over temperature range
of -54°C to +55°C (+71°C intermittent operation)]. Details, methods, and criteria specified in 4.5.4.1.1 and 4.5.4.1.2
shall apply.
4.5.4.1.1 Applied environments. The antenna shall be subjected to the following worst case cold day, hot day, and
flight environments as depicted by the test sequence of table IV. Each step must be completed in its entirety with no
interruptions. Power shall be applied in accordance with 4.5.4.1.2.
4.5.4.1.2 Applied power. Pre and post test measurements of applied power shall be taken in the test chamber at
standard conditions. A physical examination of the antenna shall be conducted after the environmental exposure.
When equipment operation is required during the temperature-altitude test, operating time shall be divided equally
between two operational frequency bands (lower and middle frequency bands) of the antenna. The method of
applying power shall be as follows:
a.
DC power equivalent to the maximum RF power specified shall be applied for the lower and middle
frequency bands.
b.
The test shall be considered failed if the power handling capability of the antenna degrades below the
reference level established above. Any discrepancy noted during the post environmental visual
examination shall be considered a failure.
TABLE IV. Temperature-altitude test sequence.
Step
Temperature
Duration
Altitude
Operation
+25°C to -54°C
1-a
Max rate
Ground
No
-54°C
-b
20 hours
Ground
No
-54°C
-c
3 hours
40,000 feet
No
-54°C
-d
1 hour
40,000 feet
Yes
-54°C to +25°C
-e
Max rate
Ground
No
+25°C to +71°C
2-a
16 hours
Ground
No
+71°C
-b
1 hour
Ground
No
+71°C
-c
3 hours
Ground
Yes
+71°C to -10°C
-d
Max rate
Ground
No
-10°C
-e
3 hours
40,000 feet
Yes
-10°C to +25°C
-f
Max rate
Ground
No
3
Repeat step one
4
Repeat step two
4.5.4.2 Shock. The antenna shall be tested in accordance with MIL-STD-810, method 516.6, procedure 1. The
test item shall be mounted in a manner reflecting normal installation on the aircraft. The shock pulse shall be half
sine, 15g and 11 milliseconds duration. Pre and post-test VSWR measurements shall be conducted and passed.
4.5.4.3 Humidity. The antenna shall be tested in accordance with MIL-STD-810, method 507.5, procedure 1,
cycle 1. Pre and post test VSWR measurements shall be conducted and passed.
4.5.4.4 Salt fog. The antenna shall be tested in accordance with MIL-STD-810, method 509.5. Pre and post-
performance measurements shall be conducted and passed.
4.5.4.5 Random vibration test. A random vibration test shall be conducted as specified in 4.5.4.5.1 through
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