MIL-DTL-46118E(MR)
APPENDIX A
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.4.3.2 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 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 forged 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 practical velocity
spread. Ten round ballistic limits shall be reported as such in a ballistic
test report as specified in MIL-STD-662.
A.4.3.3 Rejection of large velocity gap in borderline cases. If the
ballistic limit which has been attained is within + 10 fps 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.4.4
Rejection and retest of ballistic plates.
A.4.4.1 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.
A.4.4.2 First article (retests). Resubmission of ballistic retest
plates shall not be made until the manufacturer has made the necessary
corrections in the processing of the material to the satisfaction of the
procuring activity. Two retest plates shall be submitted for first article
testing and both tests must pass; otherwise, the armor material shall be
rejected.
A.4.4.3 Acceptance tests (rejection). Unless otherwise specified in the
contract or order, failure of a test plate to meet the ballistic requirements
indicates failure of the lot; however, the final decision will depend on the
outcome of retests, if submitted.
A.4.4.4 Acceptance tests (retests). If a test plate representing a lot
fails to meet the ballistic requirement, the manufacturer, upon notification
of the failure, may submit at his own expense two additional test plates from
the same lot for ballistic retest. If either of these plates fail the
ballistic test, the lot shall be rejected. The manufacturer may elect to
resubmit the lot after retreatment of the entire lot by submitting two
additional test plates. If either of these plates fail, the lot shall be
permanently rejected.
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