MIL-DTL-62420B(AT)
TABLE V. Vibration levels.
Frequency
Amplitudes (g)
(Hz)
Vertical
Latitudinal
Longitudinal
5 - 5.5
+0.5 in. (peak to peak)
+0.5 in. (peak to peak)
+0.5 in. (peak to peak)
5.5 - 25
+1 in. (peak to peak)
+1 in. (peak to peak)
+1 in. (peak to peak)
26 - 37
+0.02 in. (peak to peak)
+0.02 in. (peak to peak)
+0.02 in.(peak to peak)
37 - 500
+2
+2
+2
4.10.5 Shock. A shock testing machine capable of producing the magnitude and duration
of shock specified in 4.10.5.1 and 4.10.5.2 shall be used.
4.10.5.1 Basic shock. The periscope shall be rigidly mounted to a shock table and three
half sine wave shocks in each direction shall be applied along three mutually perpendicular axes of
the periscope (total of 18 shocks). Peak amplitude shall be 30 +3 g for 11 +1.1 ms duration in
accordance with figure 4. The periscope shall then be subjected to and pass the tests of 4.7.1.1,
4.7.1.4, 4.7.1.5 and 4.10.6.
4.10.5.2 Gun fire shock. The periscope shall be rigidly mounted to a shock table and
three half sine wave shocks in each direction shall be applied along three mutually perpendicular
axes of the periscope (total of 18 shocks) in accordance with figure 4 and table VI. At the
conclusion of this test, the unit shall show no evidence of physical damage. The periscope shall
then be subjected to and pass the tests 4.7.1.1, 4.7.1.4, 4.7.1.5 and 4.10.6.
TABLE VI. Gun fire shock levels.
Amplitude (g)
Duration (ms)
Axis
100 +10
1.0 +0.1
Vertical
55 +5.5
1.7 +0.2
Latitudinal
225 +22.5
0.5 +0.05
Longitudinal
4.10.6 Submergence. The mounting surface of the periscope shall be submerged in the
water, 3 +0.75, -0 in. (76 +19, -0 mm) depth measured between the water surface and sealing
surface, and remain for five (5) minutes and then shall have no moisture allowed through its seals
or bonds. After submergence, the periscope shall exhibit no indication of internal moisture
buildup. Verify that there is insufficient leakage to form a drop (see 6.6.1).
4.10.7 Fungus. The periscope shall be tested in accordance with MIL-STD-810, Method
508.4, except that after inoculation the periscope shall be exposed to ambient air temperatures of
80 to 84°F (27 to 29°C) at relative humidity between 96 to 100% for a 28 day duration. In lieu of
the performance of MIL-STD-810 fungus test, a certificate of compliance with supporting data
may be provided attesting that the assembly is constructed of materials that will not support
fungal growth (see 6.2).
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