MIL-DTL-11891G(AT)
the preparation of all qualification hardware shall be made available to the Government QAR
upon request . This information shall not be disclosed in whole or in part for any purpose other
than to evaluate the product submitted for qualification testing. The Government reserves the
right to conduct these tests at any time to ensure compounds in production are in conformance to
the data established during qualification.
3.3.2 Test records and compound identification. All test records must contain at a
minimum, the compound identification and source, test results, test facility identification, dates of
tests, and name of tester. These records must be signed and dated by the Government QAR or
authorized agent. The contractor will identify the method to be used during qualification and
utilize the same method during subsequent production testing. Compound numbers must be
identified to the component being qualified (i.e. bushing compound xxxxx, ground pad compound
yyyyy and roadwheel path compound zzzzz) and fully identified on the applicable test
records/data sheets. Any record, data sheet or certification lacking proper identification, or one
that does not contain clear and concise information will not be considered in compliance to these
requirements and rejected.
3.3.3 Track bushing characteristic tests. Table I has been established in order to identify
the compound performance characteristics/properties being provided for qualification for future
reference and production control purposes, pending successful qualification. Table I identifies the
requirements for establishing the characteristics of the bushing compound(s). These tests will be
performed during the fabrication of the T130E1 long bushings (P/N 11678029) required for
qualification and in accordance with the requirements established in Appendix A.
3.3.3.1 Specimen preparation. Specimens shall be prepared in accordance with the
applicable ASTM and shall be of an equivalent state of cure to that of the bushings submitted for
endurance testing. The following tests will be performed on samples taken at the final mixing of
the compound (see 4.3.1.1) and be of an equivalent state of cure as bushings submitted for
qualification: specific gravity, hardness, tensile strength, elongation, tensile stress, aged
properties, brittleness point, cure meter, thermogravimetric analysis (TGA), load deflection,
compression set and G/C mass spec. The following tests shall be performed on vulcanized
samples: hardness, adhesion, and bushing endurance (see 4.3.1.2).
3.3.3.2 Specific gravity. Specific gravity tests will be performed on the bushing
compounds subject to qualification test in accordance with ASTM D792. Specific gravity tests
will be performed on 3 samples from each compound submitted for qualification and all results
will be provided to the Government. Samples shall be taken from unvulcanized compounds at the
final mixing stage (see 4.7.1.1).
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