MIL-DTL-46063H
APPENDIX A
A.4
REQUIREMENTS
A.4.1 Resistance to penetration. The minimum required ballistic limit
shall be in accordance with the values shown in tables A-I through A-VI.
A.5 TESTS
A.5.1 Ballistic tests. Testing shall be in accordance with MIL-STD-662,
V50 Ballistic Test For Armor, except that nothing in this procedure shall be
construed to supersede or invalidate the requirements of this specification.
A.5.1.1 Temperature conditioning. Prior to the test, the test item(s) will
be temperature conditioned at least eight hours. Thermostatic control will be
such that the average temperature of the item during the test shall be 72 ± 15°F
(22 ± 8°C).
A.5.1.2
Protection ballistic limit, BL(P).
A.5.1.2.1 Normal circumstances. The BL(P) shall consist of an equal number
of fair impact complete and partial penetration velocities attained by the up-
and-down firing method. All BL(P)'s shall be computed using the highest partial
penetration velocities and the lowest complete penetration velocities. Firing
shall continue until either a 4-round BL(P) having a maximum velocity spread of
60 fps or a 6-round BL(P) having a maximum velocity spread of 90 fps has been
attained, whichever comes first in the normal sequence of firing. If both occur
simultaneously, the 6-round BL(P) will be reported.
A.5.1.2.2 Large zone of mixed results. In the event that the zone of mixed
results (difference between the high partial penetration velocity and the low
complete penetration velocity, the (PP) velocity being higher than the low (CP)
velocity) exceeds 90 fps, the firing data will be compared with the
specification minimum ballistic requirements. If the lowest complete
penetration velocity is equal to or above the minimum specified ballistic limit
velocity for the plate thickness, the ballistic limit will be computed on the
basis of 4 or 6-rounds using the smallest possible velocity spread. If the
lowest complete penetration velocity is below the minimum allowable ballistic
limit velocity, then testing will continue until a 10-round ballistic limit has
been attained using the smallest possible velocity spread. Ten-round ballistic
limits will be reported as agreed upon between contractor and procuring activity.
A.5.1.2.3 Reduction of large velocity gap in borderline cases. If the
ballistic limit, which has been determined, is within ± 10 fps from the minimum
allowable ballistic limit and a gap exists which is greater than 25 fps, then
another round, or rounds, will be fired to reduce the gap to 25 fps or less.
The ballistic limit will then be recomputed using the above criteria. The
recomputed BL(P) will be reported as the BL(P) of the plate (in borderline
cases, a reduction of the gap between the high partial penetration velocity and
the low complete velocity should result in a better evaluation of the BL(P).
A.5.2
Rejection and retest of ballistic plates.
A.5.2.1 First article tests (rejection). Unless otherwise specified in the
contract or order, failure of any of the first article test plates to meet the
minimum ballistic requirements shown in the appendix of this specification
indicates failure of the product and process.
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