MIL-DTL-62420B(AT)
M1 short driver - 0.75 in. (19 mm)
M1 wide driver - 1.35 in. (34.3 mm)
M1 tall commander - 1.35 in.
M1 short commander - 0.75 in.
12357908, 12357909, 12357918 - 0.75 in.
12357792, 12357794, 12357850, 12370033, 12370322, 12370393 - 1.35 in.
3.6.3 Cleanliness. The optical surfaces of completed instruments shall be clean and free
of condensates and volatile substances when examined in accordance with method specified in
4.9.3. Dust retention grease shall not be used except with specific authorization of the
responsible technical activity.
3.6.4 Identification and marking. All items shall be individually identified and marked in
accordance with MIL-STD-130, or equivalent and as specified in the applicable drawings.
3.6.5 Safety. The assemblies shall pose no physical hazards to personnel installing or
operating the periscope.
3.7 Operating environment requirements. Each control unit shall operate under the
following environmental conditions without damage or loss of performance.
3.7.1 Temperature.
3.7.1.1 Low temperature. The periscope shall meet the requirements of 3.4.1.1, 3.4.1.4
and 3.4.1.5, 3.7.6, respectively after exposure of 24 hours to a temperature of -65 degrees
Fahrenheit (°F) (-54 degrees Celsius (°C)). Following the -65°F exposure and with the
temperature returned to 73 +18°F (23 +8°C), the unit shall show no indication of moisture build-
up, bond separation, or other forms of image degradation.
3.7.1.2 High temperature. The periscope shall meet the requirements for 3.4.1.1, 3.4.1.4,
and 3.4.1.5, 3.7.6, respectively after exposure to three 24 hour cycles of the hot, dry temperature
profile as given in Table II with the humidity no greater than 10% during the exposure. After
exposure to the temperature profile but prior to testing, the unit shall be stabilized at 160°F
(71°C), and shall show no indication of moisture build-up, bond separation to high temperature
test, the unit shall be at a minimum of 160°F (71°C), and shall show no indication of moisture
build-up, bond separation, or other forms of image degradation.
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