MIL-DTL-11891G(AT)
4.6 Control tests.
4.6.1 Control test samples. Control test samples shall be selected in accordance with the
schedule shown in table III for bushings and table IV for roadwheel path and ground pad material.
4.6.2 Control test failure. Any deficiency in any control test component shall be
presumed to be present in components subsequently produced after selection of the control test
component unless evidence satisfactory to the Procuring Activity is presented by the contractor
that such components are not similarly defective. Upon determination that said defects do exist,
the Government reserves the right to refuse to accept further production until the contractor
demonstrates that corrective action has been taken to eliminate the cause of such defects. For
material produced after the last successful control test or for material produced prior to control
test failure, the contractor shall provide evidence that the material produced met requirements.
Evidence can be in the form of sampling inspection.
4.6.3 Additional specimens. In the event of failure of the first selected specimen to pass
the test, two additional specimens shall be selected and both shall pass the same test. If these last
two specimens pass the test, then that control test is considered to be met. Failure of the first
specimen to pass the test, or failure of either the second or third specimens to pass the test, will be
cause for the Government to discontinue acceptance and to return units previously accepted
which can be identified with the lot corresponding to the failed sample.
4.7 Methods of inspection.
4.7.1 Bushings.
4.7.1.1 Specific gravity. This test shall be performed to the requirements of 3.3.3.2.
During production, this test shall be performed as batches of unvulcanized rubber are finalized (all
ingredients have been added and mixed in the compound). Each batch of compound will be
identified and tested. The results from these tests will meet the tolerances established from data
acquired during qualification and the tolerances listed in table I.
4.7.1.2 Hardness. This test shall be performed to the requirements of 3.3.3.3. During
production, one sample will be taken on unvulcanized and vulcanized rubber on a per shift basis.
The results from these tests shall meet the tolerances established from data acquired during
qualification and the tolerances listed in table I.
4.7.1.3 Tensile strength. This test shall be performed to the requirements of 3.3.3.4.
During production one unvulcanized sample will be taken right after mixing. The results from
these tests will meet the tolerances established from data acquired during qualification and the
tolerances listed in table I.
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