MIL-DTL-62422D(AT)
3.5.6.1 Substrate. The filter substrate shall conform to the scratch and dig requirements
of MIL-PRF-13830. The filter substrate shall not exceed a surface quality of 80-50 in
accordance with table I of MIL-PRF-13830, except that the maximum bubble/inclusion diameter
shall be 1 millimeter (mm) and the minimum bubble/inclusion separation shall be 20 mm
(see 4.5.9).
3.5.6.2 Coating. Coating scratches and digs shall not exceed the values specified for the
substrate. Coating scratches and digs shall be considered separate from the substrate scratch and
dig requirements (see 4.5.9).
3.5.6.3 Cosmetic. Filters shall show no characteristics which are imperative or
distractive to a clear, uniform field of view, that is, blemishes or color variations which are
discernible/distinguishable when viewed from the normal parameters of the field of view
(see 4.4.3).
3.5.7 Laser damage resistance. Filters shall exhibit no delamination or other physical
deterioration when exposed to laser radiation (see 4.5.10).
3.5.8 Temperature stability. Filters shall meet the requirements of row A in table I when
exposed to -40±5 degrees Fahrenheit (°F) to +140±5 °F (see 4.5.11).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. First article inspection (see 4.2)
b. Conformance inspection (CI) (see 4.3)
4.2 First article inspection. Three filters of each type shall be examined for the defects
specified in table II and shall be subjected to the inspections specified in table III. Failure of any
filter to pass any of the inspections shall be cause for rejection. The Government reserves the
right to witness all the contractor's inspections.
4.2.1 First article samples. First article samples shall be three randomly selected filters
of each type to be manufactured. The filters shall be selected from a full chamber run.
4.2.2 First article inspection failure. Deficiencies found during, or as a result of, the first
article inspection shall be cause for rejection of the first article sample until evidence has been
provided by the contractor that corrective action has been taken to eliminate the deficiency. Any
deficiency found during, or as a result of, first article inspection shall be evidence that all items
already produced prior to completion of the first article test are similarly deficient unless
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