MIL-DTL-62547D
position. With the manual release locked, there shall be no discharge of Halon 1301 from an
extinguisher dropped from a height of 1 meter (m) (40 in.) (see 4.4.2.2.2).
3.4.2.3 Mechanical release. The extinguisher shall discharge the Halon 1301
extinguishing agent when a manual force between 65 and 115 N (14.6 and 25.8 lbf) is applied
in-line and results in the maximum torque on the manual release shaft or arm. After discharge
the residual Halon weight and pressure shall not exceed the limits specified in 3.4.1.2
(see 4.4.2.2.3 and 6.4.3).
3.4.2.4 Hydrostatic pressure. The extinguisher shall withstand hydrostatic pressure to 20
700 kPa (3000 psi) without damage or deformation. The extinguisher shall then meet the
electrical release and mechanical release requirements after meeting the leakage requirements of
3.4.2.5 (see 4.4.2.2.4).
3.4.2.5 Leakage.
3.4.2.5.1 Filled extinguisher. An assembly, when charged with the proper weight of
Halon 1301 and nitrogen as specified in table III, shall not have a leakage rate that exceeds
0.000145 standard cubic centimeters per second (cm3/s) [0.000009 cubic inches per second
(in.3/s)] or 28 grams per year (1 ounce per year) (see 4.4.2.2.5.1).
3.4.2.5.2 Refilling extinguisher. Following a discharge of Halon 1301, the extinguisher
shall be capable of being recharged with the proper weight of Ha1on 1301 and nitrogen specified
in table III at any temperature between -40 and 43 °C (-40 and 109 °F). After charging at
temperature extremes, the extinguisher pressure shall be 5170±170 kPa (750±25 psi) when
returned to 19 to 21 °C (66 to 70 °F). The refilled extinguishers shall not leak in excess of that
permitted in 3.4.2.5.1 (see 4.4.2.2.5.1 and 4.4.2.2.5.2).
3.5 Interface requirements.
3.5.1 Extinguisher.
3.5.1.1 Empty weight. The empty fire extinguisher shall have all components installed
or placed on the weighing scale. This weight shall be the empty weight of the extinguisher and
shall be placed, stamped or marked in a permanent manner on a caution plate conforming to
Drawing 12314504 and in accordance with 3.6.2.2.3 (see 4.4.3.1.1).
3.5.1.2 Charged weight. The empty fire extinguisher of 3.5.1.1 shall be filled with the
proper weight of Halon 1301, in accordance with table III and then supercharged with dry
nitrogen to 5170 kPa (750 psi) at 21 °C (70 °F) (nitrogen weights are given for reference
purposes only). The weights shall be marked in a permanent manner on the caution plate
(see 4.4.3.1.2 and Drawing 12314504).
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