MIL-DTL-46027K(MR)
APPENDIX A
A.3.3 Gap. A gap is the difference in fps between the high partial penetration velocity
and the low complete penetration velocity used to compute the ballistic limit when the
high partial penetration velocity is lower than the low complete penetration velocity.
A.3.4 Partial penetration, (PP). Any impact which is not a complete penetration may be
considered a partial penetration.
A.3.5 Witness plate. A thin sheet located behind and parallel to the ballistic test sample
which is used to detect penetrating projectiles or spall.
A.4 REQUIREMENTS
A.4.1 Resistance to penetration. The minimum required V50 ballistic limit shall be in
accordance with the values shown in tables A-I through A-V.
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) shall be temperature
conditioned at least eight hours. Thermostatic control shall 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) shall 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[P] velocity being higher than the low CP[P] velocity)
exceeds 90 fps, the firing data shall 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 shall
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 shall continue until a 10-round ballistic limit has been attained
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