MIL-DTL-19379C(SH)
4.3.3.1 Sampling for visual inspection. For each lot, a quantity of mounts sampled in accordance with table IX
shall be subjected to a visual examination to determine compliance with 3.5.1. Classifications of defects are shown
in table X. If one or more major defect is found in any sample, the manufacturer may screen the entire lot for
compliance prior to proceeding with qualification testing; otherwise, the entire lot shall be rejected. Minor defects
discovered on each mount shall be corrected when possible. MIL-STD-407, in conjunction with ASTM D1566,
may be used to assist in identifying defects in the resilient element. Corrective action shall be taken to prevent the
systematic occurrence of any defects.
TABLE IX. Sampling for visual inspection.
Number of mounts in the lot
Number of mounts in the sample
40 or under
10
41 to 110
15
111 to 300
25
301 to 500
35
501 to 800
50
801 to 1300
75
1301 to 3200
110
TABLE X. Classification of defects.
Category
Defects
Major:
101
Evidence of unauthorized materials, including lack of documentation demonstrating
components, were produced in accordance with material specifications listed on
803-1385824 and acquisition requirements.
102
Mount dimensions, materials, and construction not in accordance with 803-1385824 and
acquisition requirements.
103
Evidence of delamination or air pockets in resilient element.
104
Evidence of backrinding, blisters, cracks, debonding, breaks, deep gouges, tears, voids,
blisters, or other imperfections on the surface of resilient element that can effect mount
performance and service life.
105
Mounts with cure dates more than 2 years old shall not be offered.
106
Any other defect that could affect mount performance or service life.
Minor:
201
Identification marking not distinct.
202
Burrs, rough edges, and sharp corners not removed.
203
Minor surface imperfections on the rubber that will not affect mount performance or
service life.
204
Any other negligible defect which would not affect the performance or serviceability of
the mount.
7
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