MIL-DTL-62567D(AT)
that the torsion bar shall demonstrate a minimum life of 100,000 cycles. Delivery of torsion bars
which have passed group A, B and C inspection shall not be shipped until control test is
successfully completed (for exception see 6.2).
4.5.2.1 Group D sampling. Unless otherwise specified (see 6.2), torsion bars shall be
selected at the rate of 1 per each mill heat or 1 of each 400 torsion bars produced, whichever
occurs first.
4.5.2.2 Noncompliance. If a sample fails to pass Group D inspection, the contractor
shall notify the Government and the cognizant inspection activity of such failure and take
corrective action on the materials or processes, or both, as warranted and on all units of product
which are manufactured under essentially the same materials and processes, and which are
considered subject to the same failure. After the corrective action has been taken, Group D
inspection shall be repeated on additional sample units (or the reworked failed unit(s) if so
identified and agreed upon in the corrective action plan submitted by the contractor). All tests
and examinations, or the test(s)/examination(s) which the original sample failed, shall be
performed at the option of the Government. Acceptance and shipment of product shall be
discontinued until corrective action, acceptable to the Government, has been taken and Group D
inspection has shown that the corrective action was successful.
4.5.2.3 Disposition of Group D samples. Samples torsion bars which have been
subjected to group D inspection shall not be delivered as new equipment under the contract.
Torsion bars subjected to group D inspection shall be indelibly marked "DO NOT USE".
TABLE V. Group D inspection.
Inspection
Requirement
Inspection method
Endurance
3.2.5
4.6.5
4.5.3 Inspection of packaging. The sampling and inspection of packaging shall be in
accordance with the quality assurance provisions of the applicable packaging standard or
packaging data sheet specified by the Government.
4.6 Methods of inspection.
4.6.1 Heat treatment. Following final heat treatment, the sample torsion bar or control
specimen (see 4.6.1.1) shall be sectioned using a cut-off machine that will not change the
structure by overheating during sectioning. The section shall be ground and polished using
proper metallographic procedure and examined for conformance to 3.2.2.1 and 3.2.2.1.1.
4.6.1.1 Control specimen. If a control specimen is used, it shall meet the following
criteria:
a. Same diameter as the torsion bar being heat treated.
b. 6 inches minimum length.
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