MIL-DTL-52031E
Sticking of the valve or clogging of the discharge orifices shall constitute failure of this test.
4.4.2.7 Corrosion. The extinguisher shall be subjected to salt-spray action specified in MIL-STD-810,
Method 509. The extinguisher shall be operated, and the fittings and connections shall be manipulated
with regular servicing tools. Non-conformance to 3.9 shall constitute failure of this test.
4.4.2.8 Horn.
4.4.2.8.1 Accelerated aging test for plastic materials. The horn shall be placed in a circulating air oven,
heated to +194° F, and held at this temperature for 94 hours. When removed from the over, the horn
shall show no cracking or deterioration. The horn shall then be subjected to the impact test in 4.4.2.8.2.
4.4.2.8.2 Impact shock. The horn shall be cooled to -5° F. The shall be supported with a clamping
mechanism at the handgrip so that the point of impact will be on the external surface, approximately two
inches from the open end of the horn. A five pound steel ball shall be dropped, free and unguided from a
height of one foot upon the horn. This test shall be repeated a total of four times. Fracture or cracks shall
constitute failure of this test.
4.4.2.8.3 Thermal shock. The horn shall be soaked in an ice-brine (CaCl2) bath at -22° F for a period of
30 minutes. The horn shall be removed rapidly and immediately plunged into boiling water (+212° F) for a
period of 30 seconds. Fractures or cracks shall constitute failure of this test.
4.4.2.8.4 Accelerated aging. The horn shall be placed in a pressure bomb, pressurized with oxygen at
290 to 310 psig, and then the pressure bomb shall be placed in an oven. The oven shall be heated to
160° F, and the temperature shall be held for 24 hours. The bomb and horn shall cool, and then the
pressure shall be slowly released. Fractures or cracks shall constitute failure of this test.
4.4.2.8.5 Dielectric. An ac test potential of 5000 volts shall be applied to the horn for a period of one
minute. Arcing or evidence of electrical breakdown shall constitute failure of this test.
4.4.2.9 Bracket loading. A static load of 200 pounds downward, and 88 pounds upward shall be applied
long the axis of the extinguisher mounted vertically. A force of 200 pounds shall be applied outward (90°
to a longitudinal axis) at a point midway between the strap and the bottom of the bracket. Each load shall
be applied, and then removed before adding the next load. Structural failure and permanent deformation
of the bracket or release of the fastening attachment (cam lock) shall constitute failure of this test.
4.4.2.10 Puncture. The cylinder-head assembly shall be secured onto the extinguisher cylinder. When
the swivel nut is tightened, the safety pin shall be removed, and the upper portion of the valve shall be
depressed to a point where the inner holes of the safety pin are not visible. The valve shall be released,
and the cylinder-head assembly shall be removed from the extinguisher cylinder. Puncture of the
frangible safety disk before the hole is completely blocked, or any indication of contact between the
puncture pin and the frangible safety disk after the cylinder-head assembly has been removed shall
constitute failure of this test.
4.4.2.11 Safety pin. The cylinder-head assembly shall be secured to the extinguisher. With the swivel
nut tightened, the safety pin in place, 50 pounds of force shall be applied to the outer ends of the
actuating lever, and lower carrying handle. The cylinder-head assembly shall be removed from the
extinguisher. Any indication of contact between the puncture pin and the frangible safety disk, or any
deformation of cylinder-head assembly, the carry handle, carrying handle attaching pins, or actuating
lever shall constitute failure of this test.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor
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