MIL-DTL-11352K(AT)
3.7.2 Low temperature. The vision block shall meet the requirements of 3.4.1, 3.4.2,
and 3.4.3 and shall show no indication of moisture build-up, bond separation or other forms of
image degradation after being exposed to a temperature of -54 °C (-65 °F) for a period of
24 hours after stabilization (see 4.6.4.2).
3.7.3 High temperature. The vision block shall show no indication of moisture build-up,
bond separation or other forms of image degradation after being exposed to three 24-hour cycles
of the hot, dry temperature profile. Subsequently, the vision block shall meet the requirements of
3.4.1, 3.4.2, and 3.4.3 (see 4.6.4.3).
3.7.4 Basic shock. The vision block shall show no evidence of physical damage and
shall meet the requirements of 3.4.1, 3.4.2, and 3.4.3 after being exposed to three sawtooth wave
shock pulses applied in both directions along each of the three mutually perpendicular axes. The
peak amplitude of each pulse shall be 40 gravity units (g) for 11 milliseconds (ms) duration
(see 4.6.4.4).
3.7.5 Gun fire shock. The vision block shall show no evidence of physical damage and
shall meet the requirements of 3.4.1, 3.4.2, and 3.4.3 after being exposed to three gun fire shock
pulses applied in both directions along each of the three mutually perpendicular axes
(see 4.6.4.5).
3.7.6 Vibration. The vision block shall meet the requirements of 3.4.1, 3.4.2, and 3.4.3
after being subjected to vibration levels for a total of 3 hours in each of the three mutually
perpendicular axes at an ambient temperature of 60 °C (140 °F). At the conclusion of the test,
the vision block shall be returned to room ambient temperature and show no evidence of physical
damage (see 4.6.4.6).
3.7.7 Humidity resistance. The vision block shall evidence no delamination, or other
physical deterioration after being exposed to the relative humidity and air temperature profiles,
and subsequently, shall meet the requirements of 3.4.1, 3.4.2 and 3.4.3 (see 4.6.4.7).
3.7.8 Corrosion resistance. The vision block shall meet the requirements of 3.4.1, 3.4.2,
and 3.4.3 and shall show no evidence of bond separation, corrosion or other physical damage
after being exposed to a salt fog solution for 48 hours (see 4.6.4.8).
3.7.9 Weathering resistance. The vision block shall evidence no delamination or other
physical deterioration when exposed to not less than 350 hours of simulated sunshine, and shall
subsequently meet the requirements of 3.4.1, 3.4.2, and 3.4.3 (see 4.6.4.9).
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