MIL-DTL-46027K(MR)
4.7.3.1 Ballistic testing facility. Unless otherwise specified in the contract or purchase
order (see 6.2), the ballistic test plates shall be forwarded to the Commander, USA ATC,
ATTN: CSTE-DTC-AT-SL-V, Building 358, 400 Colleran Road, APG, MD 21005-5059
for ballistic testing for first article or lot acceptance.
4.7.3.2 Incomplete penetrations. When a complete penetration can not be obtained, the
following rule shall be in effect until a new ballistic acceptance round can be developed
and utilized. When the ballistic velocities of four (4) partial penetrations are above the
minimum ballistic requirement for the specific thickness, the material shall be certified as
acceptable with a V50 (which obviously can not be explicitly determined) above the
minimum requirement.
4.7.4 Stress corrosion. The stress corrosion specimens shall be stressed at 30 ksi.
4.7.4.1 Capability requirements for resistance to stress corrosion. When stress corrosion
testing is required (see 6.2), stress corrosion test specimens shall be prepared and tested
in accordance with ASTM G47.
4.8 Rejection and retest. Unless otherwise specified in the contract or order (see 6.2) and
except as specified in 4.7.2 and 4.7.3, rejection and retest shall be conducted in
accordance with 4.8.1, 4.8.1.1, and 4.8.2.
4.8.1 Rejection of first article plates. When one or more first article test specimens fail
to meet the requirements of 4.3, the product lot and process, represented by the test plates
or specimens shall be subject to rejection except as otherwise provided in a sampling plan
approved by the procuring activity and in requirements of 4.8.1.1.
4.8.1.1 Retest of first article samples. Resubmission and retest of first article samples
shall not be made until the manufacturer has made necessary corrections in the
processing of the material to the satisfaction of the procuring activity. If one of the retest
specimens fails the lot shall be permanently rejected with no further testing permitted.
4.8.2 Ballistic. Rejection and retest of ballistic test plates shall be in accordance with
A.5.2.
4.8.3 Stress corrosion. Immediately upon notification of the failure of the specimens, the
manufacturer may at his own expense submit thirteen additional specimens for testing. A
minimum of seven specimens shall show no cracks at the end of 96 hours when tested as
specified in 4.7.4.
4.9 Reduced testing. At the discretion of the procuring activity (see 6.2), the amount of
testing may be reduced provided the results on consecutive lots indicate that a uniform
product meeting the testing requirements is being produced and providing the
manufacturer agrees to maintain the same manufacturing procedures. Testing for a given
plate thickness shall return to standard (non-reduced testing) conditions of one plate per
lot, whenever a ballistic test plate fails to meet ballistic requirements.
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