MIL-C-52980B
4.5.2.6 High temperature. Unless otherwise specified (see 4.5.2.18), subject the compressor
to an ambient temperature of 120 +5 °F until all components have stabilized at this temperature.
Then start and operate the compressor at rated capacity and pressure for not less than 4 hours
while maintaining 120 +5 °F ambient temperature. Adjustments to the engine or compressor unit
shall not be permitted after the first hour of operation. The operating time for this test may be
counted toward the accomplishment of the endurance test. Record the data as specified in
4.5.2.5 at 30-minute intervals. Failure to start and operate at rated capacity, pressure and speed,
discharge air temperature in excess of ambient +100 °F or requirement for replacement of parts
shall constitute failure of this test.
4.5.2.7 Low temperature. Unless otherwise specified (see 4.5.2.19), subject the compressor
to an ambient temperature of -25 +5 °F until all components have stabilized at this temperature.
Then start and operate the compressor at rated capacity, pressure and speed for not less than
4 hours while maintaining minus 25 +5 °F ambient temperature. Adjustments to the engine or
compressor unit shall not be permitted after the first hour of operation. The operating time for
this test may be counted toward the accomplishment of the endurance test. Record the data as
specified in 4.5.2.5 at 30-minute intervals. Failure to operate at rated capacity, pressure and
speed, or requirement for replacement of parts shall constitute failure of this test.
4.5.2.8 Cycling. Start the compressor and allow the receiver pressure to build up until the
pressure-regulation control operates. Then reduce the receiver pressure until the
pressure-regulation control activates to increase the pressure. Vary the pressure as above until a
total of 20 high-pressure actuations and 20 low-pressure actuations have been reached. Inability
of the pressure-regulation control to control the pressure as specified shall constitute failure of
this test.
4.5.2.9 Pressure regulation, size 5-cfm. When an adjustable pressure-regulating valve of the
pressure-relief type actuated by receiver pressure is used, at the beginning and after completion
of the endurance test, start the compressor and allow the receiver pressure to build up to
determine pressure required to discharge full capacity through the pressure-regulating valve.
Then reduce the receiver pressure to determine the pressure at which the pressure-regulating
valve reseats. Inability to meet the requirements specified in 3.26.8 shall constitute failure of this
test.
4.5.2.10 Electromagnetic interference. The compressor sha1l be tested in accordance with
MIL-STD-462 to determine conformance to 3.11. The contractor shall furnish the contracting
officer the first article test report for evaluation. Failure to meet the requirements of 3.11 shall
constitute failure of this test.
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