MIL-DTL-62547D
rate, a commercial leak detector or precision weighing method shall be used to determine
leakage rate.
4.4.2.2.5.2 Refilling extinguisher.
4.4.2.2.5.2.1 Low temperature refilling. To determine conformance to 3.4.2.5.2, an
empty extinguisher and the refill kit being used to charge the extinguisher shall be allowed to
soak at -51 °C (-60 °F) for 24 hours or until the temperature of the extinguisher and the refill kit
stabilizes as specified in 4.3.2.2. Increase the temperature to -40 °C (-40 °F) and soak for 4
hours. Transfer the appropriate weights of Halon 1301 and nitrogen (compensating for weight of
frost formation) as specified in table III into the empty extinguisher from the kit. Return the
extinguisher to 19 to 21 °C (66 to 70 °F) and allow it to stabilize at which time the pressure shall
be 5170±170 kPa (750±25 psi). The total weight and the leakage rate shall be measured and
shall meet the requirements of 3.4.2.5.1 and table III.
4.4.2.2.5.2.2 High temperature refilling. To determine conformance to 3.4.2.5.2, an
empty extinguisher and the refill kit being used to charge the extinguisher shall be allowed to
soak at 51 °C (124 °F) for 24 hours or until the temperature of the extinguisher and the refill kit
stabilizes as specified in 4.3.2.2. Decrease the temperature to 43 °C (109 °F) and soak for 4
hours. Transfer the appropriate weights of Halon 1301 and nitrogen (compensating for weight of
condensation) as specified in table III into the empty extinguisher from the kit. Return the
extinguisher to 19 to 21 °C (66 to 70 °F) and allow it to stabilize at which time the pressure shall
be 5170±170 kPa (750±25 psi). The total weight and the leakage rate shall be measured and
shall meet the requirements of 3.4.2.5.1 and table III.
4.4.3 Interface requirements verification.
4.4.3.1 Extinguisher.
4.4.3.1.1 Empty weight. The extinguisher shall be weighed using a scale when all of the
components are properly installed within the extinguisher and prior to the filling of the proper
weight of Halon 1301. To determine conformance to 3.5.1.1, verify the empty weight as defined
in 3.5.1.1 is marked in a permanent manner on the caution plate.
4.4.3.1.2 Charged weight. The extinguisher shall be weighed using a scale when all of
the components are properly installed within the extinguisher and when the proper weight of
Halon 1301 has been filled. To determine conformance to 3.5.1.2, verify that the measured
charged weight has been marked in a permanent manner on the caution plate.
4.4.4 Support and ownership requirements verification.
4.4.4.1 Discharge valve.
4.4.4.1.1 Repair parts and tools.
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