A-A-52471D
d. Climatic extremes. The fire extinquisher shall operate at any air temperature from -50 deqrees Fahrenheit (“F) without any benefit of solar radiation to +120°F while exposed to a solar radiation intensity of 360 Btu/sq ft./hr and shall be capable of safe storage at temperatures from -60°F for a period of 72 hours to +145°F for a period of 4 hours daily.
e. Carbon Dioxide. The fire extinguisher shall contain 2 pounds 8 ounces + O% - 5% of CO2 in accordance with BB-C-101.
f. Fragmentation and nonshatterability . Applicable cylinder shall not exceed 25 percent of its dimensional size in figure 1 after being subjected to the following:
1. Steel cylinder fragmentation resistance. When pierced by a tumbling. 50 caliber M–2 armor-piercing projectile at a minimum velocity of 2,600 feet per second, the charged cylinder shall remain in one piece. To conduct the test the range of projectile fire shall be 50 yards maximum and the cylinder may be supported but not constrained. The test shall be conducted at gun room ambient temperature. Each cylinder shall be tested progressively, in a different position as detailed following:
(a) With the longitudinal axis of the cylinder normal to the line of fire.
(b) With the longitudinal axis of the cylinder 45 degrees from normal toward the gun position.
(c) With the longitudinal axis of the cylinder parallel to the line of fire with inlet port face away from the gun position.
2. Aluminum cylinder nonshatterability. When pierced by a non-tumbling . 50 caliber armor-piercing projectile at a velocity of 2800 +100 feet per second, the charged cylinder shall not shatter. To conduct the test the cylinder shall be in such a position that the projectile strikes the cylinder at right angles to the longitudinal centerline and near to the vertical centerline of the cylinder. The cylinder temperature at time of test shall be between 50 and 100”F. A cylinder shall be considered as having failed this test if the cylinder breaks into more than two pieces provided, however, that pieces smaller than 2 inches in diameter coming from the area (centering on the perforation and 4 inches in diameter) on the cylinder adjacent to the point of entry and exit of the projectile will not be counted. Cylinder designs, representative samples of which have passed this test, shall be permanently marked “NONSHAT” on the shoulder to indicate this fact.
g. Low temperature performance. Cool the fully charged extinguisher to a temperature of -40°F + 2°F and maintain at this temperature for not less than 12 hours. At the conclusion of this period, the extinguisher shall be immediately discharged. Sticking of the valve or clogging of the discharge orifices shall constitute failure of this test.
h. Shock requirements. The fire extinguisher assembly shall show no signs of damage when subjected to the shock which consists of imposing three shock impulses in each direction of the axis (6 shocks per axis) at each of the amplitudes and durations specified in table I. The shock requirements shall be verified by test procedures outlined in ATPD 2167.
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