MIL-PRF-46736E
4.6.2 Vibration resistance. Unless otherwise specified by the procuring activity (see 6.2),
the filter element shall be mounted on a vibrating machine in a manner simulating intended use
when installed in an air cleaner. The filter element shall be subjected to simple harmonic motion
having an amplitude of 0.08 cm (0.03 in.) [0.15 cm (0.06 in.) maximum total excursion], the
frequency being varied uniformly between the approximate limits of 10 to 55 hertz (Hz). The
entire frequency range, from 10 to 55 Hz and return to 10 Hz, shall be traversed in approximately
one minute. The duration of the vibration shall be eight hours in the vertical axis and 4 hours in
each of the horizontal axis. The test shall be conducted first in an ambient temperature of
65.5 + 3°C (150 + 5°F), then repeated in an ambient temperature of -54 + 3°C (-65 + 5°F). Upon
completion, the filter element shall be examined.
4.6.3 Efficiency after vibration. The tests shall be conducted as follows:
a. Efficiency test shall be conducted and the efficiency determined as specified in
4.4.3.
b. Without cleaning the element, the vibration resistance test shall be conducted in
accordance with 4.6.2, but at a temperature of 27 + 3°C (80 + 5°F) only.
c. The filter element shall be cleaned as specified in 4.4.5 and efficiency test of 4.4.3
shall be conducted. The efficiency shall be not less than 99.5%.
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 activity to ascertain requisite
packaging requirements. Packaging requirements are maintained by the Inventory Control Point's
packaging activity within the Military Department or Defense Agency, or within the Military
Department's System Command. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
6.1 Intended use. The filter elements are military unique because of its applications and
physical performance used specifically on military vehicles. Because of its rigid military
performance, the filter element has no commercial applications.
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