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|  MIL-C-52980B
4.5.2.11 Noise level test. Noise levels shall be measured in accordance with MIL-STD-1474
requirements and reported in the format indicated by MIL-STD-1474, figure 7. As a minimum,
noise levels shall be measured when equipment is operating under full load. MIL-STD-1474,
5.1.2.1.4 contours shall be taken at not fewer than 12 equal (horizontal) arc increments; one
increment shall include data from the noisiest position. Additionally, the noise level at the
typical operating position shall be provided as dB(A) level. Failure to comply with
MIL-STD-1474 provisions shall constitute failure of this test.
4.5.2.12 Class 2.
4.5.2.12.1 Stability. During the performance of the endurance test, measure the movement
during three 8-hour periods of operation. The first period shall be between 0 to 25 hours, the
second period between 250 and 300 hours, and the third, between 450 and 500 hours. At the
beginning of each of these 8-hour periods, place the landing feet of the handtruck within circles
marked, scribed, etched, or painted on the floor. The circles shall be 6 inches in diameter or
2 inches larger in diameter than the rubber feet, whichever is larger. The compressor shall be
held to the floor by gravity alone, and movement shall in no way be restricted by mechanical
attachments, braces, wheel chocks, or other means integral to the compressor. Location of either
or both of the rubber feet, wholly or in part, outside of or upon the circles at any time during the
8-hour period of operation shall constitute failure of this test.
4.5.2.12.2 Mobility. After completion of the 500 hour endurance test, conduct a test for
mobility as follows:
a. Elevate the handle to a height of not less than 30 inches nor more than 48 inches and
move the compressor not less than 100 yards turning in complete circles to the right
and left during the movement. At least 50 yards of the movement shall be in a
straight line. Cart the compressor over a 12-inch drop onto a concrete surface not less
than three times.
b. Tilt the compressor to an angle of not less than 45 degrees by elevating one side of
the frame and allowing the wheel and landing leg on the opposite side of the frame to
rest on a concrete floor. Allow the elevated side to fall to a position of rest on the
concrete floor without any restraining forces being applied. Do this not less than two
times for each side.
c. Inability to be moved by one man, inability to be carted in a straight path, inability to
be turned either to the right or the left, or fracture or permanent deformation of any
component or part or leakage of gasoline from the tank shall constitute failure of this
test.
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