MIL-PRF-62048C
4.5.3.4 Service Life. To determine conformance to 3.4.10 the air cleaner, with a new
element installed, shall be set up as shown in figures 2 or 3, and the air set to the rated airflow.
The restriction at the start of testing, and at 10-minute intervals throughout the test, shall be
recorded; after obtaining the initial restriction at rated airflow, vary the airflow (see figure 1).
The avera e actual airflow for this cycle is 60% of rated flow. Coarse dust shall be fed at
g
0.883 g/m of actual airflow. The dust capacity test shall be terminated after 20 hours. Verify
that the air flow restriction did not exceed 5.0 kPa (20 inches water). At completion of the filter
element shall be viewed through the assembly outlet for visual signs of dust tracking on the
clean side of the seal or the filter element media. Any visual signs of dust tracking shall be
cause for rejection.
4.5.3.5 Post-service airflow restriction. To determine conformance to 3.4.8 the element
or filter pack assembly shall be removed from the air cleaner after the service life test. In filter
pack type cleaners, the element shall be disassembled from the basket and spacers. The filter
element shall be compressed-air cleaned. The air hose nozzle shall be inserted into each element
pocket and the deposited dust shall be blown from the filter element using a back and forth
motion. The element shall be first blown in a direction opposite to normal to airflow and then in
a direction normal to airflow using care to remove dust from edges and seams. After thorough
cleaning, the filter element shall be reassembled in the air cleaner. Airflow shall be adjusted to
rated flow and the restriction determined.
4.5.4 Environmental.
4.5.4.1 Vibration resistance. Unless otherwise specified by the procuring
activity/acquisition document (see 6.2), to determine conformance to 3.4.12.1 vibration
resistance testing shall be performed on elements loaded per 4.5.3.3 and not cleaned. Mount and
support air cleaner on a vibration machine. The air cleaner shalt be subjected to a simple
harmonic motion having a double amplitude of 0.08 cm (0.03 inch), with the frequency being
varied uniformly between the approximate limits of 10 and 55 hertz (Hz). The entire frequency
range, from 10 to 55 Hz and returning to 10 Hz, shall be traversed in approximately 1 minute.
This motion shall be applied for a duration of 12 hours in a vertical direction and 6 hours in the
longitudinal horizontal direction and 6 hours in the transverse direction. Subsequently, the air
cleaner shall pass the tests of 4.5.3.1 and 4.5.3.3.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When actual packaging of materiel is to be
performed by DoD personnel, these personnel need to contact the responsible packaging activ ity
to ascertain requisite packaging requirements. Packaging requirements are maintained by the
Inventory Control Point's packaging activity within the Military Department of Defense Agency,
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