MIL-PRF-62284B(AT)
3.6.3 Shock (non-operating).
3.6.3.1 Basic intensity. The blower shall be capable of withstanding exposure to three
half sine wave shock pulses of 40 ± 4 gravity units (g s) for a duration of 18 ± 3 milliseconds
(ms) applied in both directions along three mutually perpendicular axes as shown in figure 12.
3.6.3.2 High intensity. The blower shall be capable of withstanding three half sine wave
shock pulses of 100 ± 10 g s for a duration of 1.0 ± 0.2 ms applied in both directions along the
three mutually perpendicular axes.
3.6.4 Waterproofness. The assembly shall be capable of withstanding 6 pounds per
square inch differential (psid) air pressure developed such that the blower internal air pressure
exceeds the external pressure while submerged in clear water for 5 minutes without evidence of
leakage.
3.6.5 Dust. The assembly shall be capable of operating as specified herein during the
coarse dust test for 50 hours. The dust particle size and distribution by weight shall be as
specified in table I.
TABLE I. Coarse dust test requirements.
Dust size (microns)
Percent dust of total weight
0-5
12 ± 2
5 - 10
12 ± 3
10 - 20
14 ± 3
20 - 40
23 ± 3
40 - 80
30 ± 3
80 - 200
9±3
3.6.6 Humidity. The assembly shall meet the requirements specified herein after
exposure to humidity conditions of 100% relative humidity.
3.6.7 Corrosion. The assembly shall be capable of operating as specified herein after
exposure to a 5% sodium chloride atomized spray for 48 hours minimum.
3.6.8 Protective finish and color. Unless otherwise specified (see 6.2), the blower
assembly shall be cleaned, pretreated and primed in accordance with the manufacturer s standard
practice (see 6.5). The topcoat color shall be forest green.
4. VERIFICATION
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