MIL-DTL-62547D
4.4.2.2 Extinguisher.
4.4.2.2.1 Anti-recoil device. To determine conformance to 3.4.2.1, the extinguisher,
with the anti-recoil device securely installed in the valve and the manual release locked in the
closed position, shall be electrically actuated while laying-unrestrained on a flat table or floor.
No part of the extinguisher shall move more than 150 mm (6 in.) total nor at a velocity that
exceeds 40 mm/s (1.6 in./s). The test shall be repeated at least 3 times, each test on a different
extinguisher.
4.4.2.2.2 Manual release lock. To determine conformance to 3.4.2.2, the extinguisher,
with the anti-recoil device installed and the manual release locked in the valve-closed position,
shall be dropped on a 50-mm (2-in.) thick plywood floor (backed by steel) from a height of 1 m
(40 in.) so that the manual release lever strikes the floor. There shall be no discharge of Halon
1301 as the result of this action.
4.4.2.2.3 Mechanical release. To determine conformance to 3.4.2.3, the extinguisher
shall be mounted rigidly. Remove the anti-recoil device and disconnect the manual release lock
from the extinguisher. Using a load cell or push-pull scale and applying a force slowly, record
the force that is required to activate the valve. The manual force required to discharge the Halon
1301 shall be between 65 and 115 N (14.6 and 25.8 lbf) when applied in-line, resulting in
maximum torque on the manual release shaft or arm. A check for residual Halon weight and
pressure shall then be made.
4.4.2.2.4 Hydrostatic pressure. To determine conformance to 3.4.2.4, the manual release
shall be locked in the valve-closed position. The pressure relief device, pressure indicator, main
piston or poppet (if necessary), and internal parts that may be damaged by hydrostatic testing
shall be removed and replaced with sealing plugs. An extinguisher shall be fitted with a hand
pump and faster pressure gage and filled with alcohol or other test liquid which has the following
properties: Low volatility, self-evaporating, noncorrosive, nontoxic, and not damaging to seals.
The test liquid shall be pumped into the extinguisher so that both the inlet and outlet portions of
the valve are subjected to 20,700 kPa (3000 psi). The pressure shall be maintained at 20,700 kPa
(3000 psi) for at least 5 minutes and then released. The discharge valve shall be disassembled
from the receiver bottle and thoroughly dried, without cooling, by use of clean filtered air or
nitrogen to remove residual moisture. Inspect the valve and compare it to Drawing 12370477.
Removed parts shall be replaced. The discharge valve shall be mounted to an instrumented
receiver bottle, filled with extinguishant and nitrogen, and tested in accordance with 4.4.2.2.5.1
and 4.4.2.2.5.2.
4.4.2.2.5 Leakage.
4.4.2.2.5.1 Filled extinguisher. To determine conformance to 3.4.2.5.1, upon receipt of a
shipment of extinguishers, the total weight of each extinguisher shall be compared to the total
weight indicated on the tag attached to the receiver bottle neck. The date on the tag shall be used
to establish that loss of weight does not exceed 0.000145 cm3/s (0.000009 in.3/s) or 28 grams per
year (1 ounce per year). Units weighing less than permitted shall be returned to the manufacturer
for correction of defect(s). If sufficient time has not passed to accurately determine the leakage
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