MIL-DTL-62547D
3.7.2.4 Water leakage.
3.7.2.4.1 Immersion. The extinguisher shall meet the requirements of 3.7 when
immersed in water. There shall be no evidence of bubbles coming from within. The valve shall
then meet the requirements of 3.4.1.2 without the benefit of drying after the immersion test (see
4.4.5.2.4.1).
3.7.2.4.2 Water jet. The extinguisher shall meet the requirements of 3.7 following
exposure to a water jet cleaning spray condition (see 4.4.5.2.4.2).
3.7.2.5 Salt fog. The extinguisher shall meet the requirements of 3.7 and show no
evidence of corrosion after prolonged exposure to a salt laden atmosphere (see 4.4.5.2.5).
3.7.2.6 Fungus. The extinguisher shall meet the requirements of 3.7 and shall show no
evidence of microbiological growth that could adversely affect performance following prolonged
exposure to an environment favorable to fungus growth for a period of 90 days (see 4.4.5.2.6).
3.7.2.7 Sand and dust. The extinguisher shall withstand exposure to air driven sand and
dust. It shall subsequently meet the requirements of 3.7 without any type of cleaning
(see 4.4.5.2.7).
3.7.2.8 Humidity. The extinguisher shall meet the requirements of 3.7 when exposed to
high humidity environments (see 4.4.5.2.8).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. First article inspection (see 4.1.1).
b. Conformance inspections (CI) (see 4.2).
1. Examination (see 4.2.2).
2. Tests (see 4.2.3).
4.1.1 First article inspection. Unless otherwise specified, first article samples shall
consist of four valves or four extinguishers, as specified (see 6.2), when a first article sample is
required. Each extinguisher shall consist of a valve and a cylinder of the class specified (see 1.2
and 6.2). When valves only are specified they shall be subjected to testing with cylinders as
complete extinguishers. Approval of the first article sample by the Government shall not relieve
the contractor of his obligation to supply parts that are fully representative of those inspected as a
first article sample. Any changes or deviation of the production units from the first article
sample shall be subject to the approval of the contracting officer.
4.2 Conformance inspection. Conformance inspection shall include the examinations of
4.2.2 and the tests of 4.2.3.
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