MIL-PRF-5350G
4.6.15 Low temperature. The transmitter shall be subjected to a temperature of -67° ± 3°F
for 4 hours. At the end of this period and while still at this temperature, the transmitter shall
be subjected to the friction and scale error tests.
4.6.16 High temperature. The transmitter shall be subjected to 250° ± 3°F for remotely
mounted transmitters or 374° ± 3°F for direct engine mounted engine transmitters for a
period of 6 hours. The transmitter shall be electrically connected to the standard production
indicating unit with power applied during this test. At the end of this period, with the
transmitter still at the test temperature, the transmitter shall be subjected to the scale error
and friction error tests.
4.6.17 Vibration.
4.6.17.1 Shock mounted transmitter. Shock mounted transmitters shall be subjected to the
vibration test in RTCA/DO-160, using the test levels specified in table I. Throughout the
vibration test, an input shall be applied to the sensing element sufficient to produce
approximately a half-scale indication on the indicating standard. The amplitude of pointer
oscillation of the standard production indicating unit shall not exceed the tolerance specified
in the acquisition document. Following the vibration period the transmitter shall be
subjected to the scale error test on upscale readings only.
4.6.17.2 Direct engine mounted transmitters. Direct engine mounted transmitters shall be
subjected to the vibration test in RTCA/DO-160, using the test levels specified in table II.
Following the vibration period, the transmitter shall be subjected to the scale error test for
upscale readings only.
4.6.18 Low temperature (non-operational). The transmitter shall be subjected to -85° ± 3°F
for 50 hours. The temperature shall then be raised to -65° ± 3°F for 24 hours. The
transmitter shall then be subjected to the low temperature test. The transmitter shall then be
returned to room temperature for 4 hours and then subjected to the scale error test.
4.6.19 Pressure altitude. The transmitter shall be subjected to a pressure altitude test with
an absolute internal chamber pressure of 0.64 ± 0.1 inch Hg (85,000 ± 3,000 feet). The
transmitter vent shall be held at the prevailing atmospheric pressure. The transmitter shall
then be subjected to the scale error test for upscale pressure only.
4.6.20 High temperature (non-operational).
4.6.20.1 Remotely mounted transmitters. The transmitter shall be exposed to 293° ± 3°F
for 50 hours. The transmitter shall be returned to room temperature for 4 hours. The
transmitter shall then be subjected to the scale error and friction error tests.
4.6.20.2 Direct engine-mounted transmitters. The transmitter shall be exposed to 450° ±
18°F for 80 hours and returned to room temperature for 4 hours. The transmitter shall then
be subjected to the scale error and friction error tests.
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