MIL-PRF-62309G
subsequently air cleaned three times, the time for the assembly to reach load capacity a fourth
time, at a rate of 0.88 g/m3 (0.025 g/ft3) shall not be decreased by more than 45%. Dust tracking
shall not develop on the down-stream side of the filter element during these cycles (see 4.3.5.1).
3.5.2 Washing durability. The assembly shall meet the requirements of 3.3.3 after the
filter element reaches load capacity (see 6.5.2), and then washed, cleaned and dried (see 4.3.5.2).
3.5.2.1 Post service air flow pressure drop. After one operation to load capacity (see
6.5.2) in accordance with 3.3.2, followed by a cleaning in accordance with 4.3.5.2.1, the
assembly air-flow pressure drop shall not have increased by more than 0.25 kPa (1 in. of water)
above that measured in 3.3.1.
3.5.3 Marking. Identification and marking shall be permanent in accordance with
SAE AS478, and shall include as a minimum, the manufacturer s identification code (CAGE),
contract number, part number, maximum rated air-flow, and month and year of manufacture
(see 4.3.5.3 and 6.2).
3.5.4 Workmanship. The element shall be free of cracked end caps, visually apparent
surfaces out of alignment or out of contour, and missing portions of material. Sheet metal parts
shall be free of blisters, tears, and excessive thinning at drawn sections. The element seal shall
be properly seated inside the end cap channel with no separation between the seal and channel.
There shall be no excessive adhesive adjacent to the bonding surface. The interior shall contain
no foreign particles. The media shall contain no tears, rips, or holes (see 4.3.5.4).
3.6 Operating environment requirements. The filter element shall operate under the
following environmental conditions without degradation of performance (see 3.3.3).
3.6.1 Dust filtration. Unless otherwise specified (see 6.2 and 6.5), dust filtration
requirements (see 3.3.1 through 3.3.3, 3.5.1 through 3.5.2.1 and 3.6.4 through 3.6.6) shall be met
by Master Box Assembly Gage Drawing 10959082 containing filter element interfaces of
Drawing 11669740 (see 3.4.2). Except as otherwise specified herein, requirements shall be met
with a clean, new element and under the following standard conditions (see 4.3.6.1 and 6.2):
23 ±10 degrees Celsius (C) [73 ±18 degrees Fahrenheit (F)].
a. Temperature:
b. Relative humidity: 50 ± 15 percent (%).
1.169 kilogram per cubic meter (kg/m3)
c. Density of air:
[0.073 pounds per cubic foot (lb/ft3)] at 27C (80F) and
101 kPa [29.92 in. of mercury (Hg)].
d. Dust:
Chemical analysis of the dust shall be as shown in table II.
Particle size distribution shall be in accordance with
ISO 5011.
25,485 L/min (900 ft3/min).
e. Air flow:
0.883 ± 0.177 g/m3 [0.025 ± 0.005 gram per cubic foot (g/ft3)]
f. Dust feed rate:
of air.
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