MIL-DTL-11352K(AT)
3.4.2 Optical density. For vision blocks with laser filters, the optical density
requirements for specific wavelength ranges shall be as specified in MIL-PRF-62422
(see 4.6.3.2).
3.4.3 Resolving power. Resolving power, over all areas that are 6.4 mm (0.250 in.) or
more from the inner edges of the vision block case, shall be sufficient to permit detection of an
angular separation of 75 seconds of arc (see 4.6.3.3 and 6.5.3).
3.4.4 Ballistic resistance. The vision block shall withstand the impact of the applicable
type of projectile (see 4.6.3.4).
3.5 Interface requirements. Each item shall accommodate the following inputs and
interfaces.
3.5 1 Interchangeability. Interchangeability tolerance should permit parts, subassemblies
and assemblies to be used in their parent assemblies without regard to the source of supply or
manufacturer. Parts, subassemblies and assemblies having the full range of dimensions and
characteristics permitted by the specification governing the part, subassembly or assembly
should be usable as replacement items without selection and without departure from the specified
performance guidelines of the parent items (see 4.6.2).
3.6 Support and ownership.
3.6.1 Finish. Metal cases shall be cleaned in accordance with an appropriate method
for the material being used and given a zinc phosphate spray application of not less than
1615 milligrams per square meter (mg/m2) (0.0053ounces per square foot (oz/ft2)). The case
shall be primed with an alkyd, corrosion-inhibiting, lead and chromate free primer coating,
containing no more than 420 grams per liter (g/L) (3.5 pounds per gallon (lb/gal)) of volatile
organic compounds. A finishing coat shall be applied, chemical agent resistant, in accordance
with MIL-DTL-64159 or MIL-DTL-53039, conforming to the color and infrared reflectance
characteristics (see 4.6.2).
3.6.2 Identification marking. The identification marking shall identify the vision block
number and provide a number for each item in accordance with the instructions on the item
drawing. The marking shall not impair optical characteristics of the vision block (see 4.6.2).
3.7 Operating environment requirements. The vision block shall operate under the
following environmental conditions, without degradation in performance.
3.7.1 Temperature fluctuation resistance. The vision block shall withstand exposure to
temperature extremes, from minus (-) 54 to plus (+) 71 °C (-65 to +160 °F) without cracking or
showing signs of distortion and shall subsequently meet the requirements of 3.4.1, 3.4.2, and
3.4.3 (see 4.6.4.1).
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