MIL-PRF-52666F
4.5.2.4 Differential pressure dial gauge. Subject the gauge to a hydrostatic pressure equal to
the maximum scale pressure, hold at this pressure for a minimum of 30 minutes, then release the
pressure. Within 10 minutes after the pressure is released, and without re-calibration or
adjustment, readings shall be taken at three intervals on the scale: the maximum inlet or
operating pressure obtained on the test F/S during the differential pressure test specified in
4.5.2.3, the pressure at which the filter-coalescer element(s) is required to be changed, and the
maximum scale pressure. A dead-weight tester, or mercury manometer with air pressure or
calibrated check gauge shall be used in calibrating the gauge, if required. Testing of the gauge
shall be in an ambient temperature of 68°F (20°C) plus or minus 10°F (6°C). Nonconformance
to 3.3.7 shall constitute failure of this test.
4.5.2.5 Environmental verification requirements.
4.5.2.5.1 High temperature tests. The F/S shall be tested for high temperature storage and
operation in accordance with MIL-STD-810, method 501.3, procedure I and II. The maximum
test temperature for storage shall be 160°F (71°C) and the maximum operating temperature shall
be 125°F (52°C). The operating period for this test shall be one hour at the constant maximum
temperature. Nonconformance of the F/S to the requirements specified in 3.4.1 and 3.4.2 during
and after exposure to high temperatures shall constitute failure of either temperature test.
4.5.2.5.2 Low temperature tests. The F/S shall be tested for low temperature storage and
operation in accordance with MIL-STD-810, method 502.3, procedure I and II. The lowest test
temperature for storage shall be minus 50°F (-46°C), and the lowest operating temperature shall
be minus 25°F (-32°C). The operating period for this test shall be one hour at the constant
minimum temperature. Nonconformance of the F/S to the requirements specified in 3.4.1 and
3.4.2 during and after exposure to low temperatures shall constitute failure of either temperature
test.
4.5.2.5.3 Sand and dust. The F/S shall be tested to verify the effects of sand and dust on
performance in accordance with MIL-STD-810, method 510.3, procedure I and II.
Nonconformance to 3.4.3 shall constitute failure of this test.
4.5.2.5.4 Salt Spray. The F/S shall be subjected to 5 % salt spray test in accordance with
ASTM B 117 for 24 hours. Nonconformance to 3.4.4 and the applicable requirements of ASTM
B 117 shall constitute failure of this test.
4.5.2.5.5 Vibration. The F/S shall be transported by a 5-ton cargo truck, over cross-country
tactical terrain, at an average speed of 8 mph (13 kph) for a total of 100 miles. The F/S shall be
tested as specified in 4.5.2.1 upon conclusion of the 100 miles. Breakage of the frame or damage
to the F/S or components or nonconformance to 3.4.5 and 4.5.2.1 shall constitute failure of this
test.
4.5.2.5.6 Shock. The F/S shall be dropped on an 8 inches (20 cm) thick bed of dry sand, from
a height of 60 inches (152.4 cm). All drops shall be made so that the F/S falls freely through the
distance specified. The F/S shall be dropped four times on each bottom corner. Upon conclusion
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