MIL-DTL-8878L
TABLE II. Qualification test sample distribution.
Test
Quantity
Rotational movement
1
Torsion
Use rotational movement sample
Hardness
Use rotational movement sample
Tensile fatigue
1
Breaking strength
1
Locking clip retention
1
Bending
Use breaking strength sample
4.3.2 Tests. The qualification tests of turnbuckle component parts shall consist of all the
4.3.3 Maintenance of qualification. At specified intervals determined by the qualifying
activity, the manufacturer must be able to demonstrate that the company still has the capabilities
and facilities necessary to produce the QPL items in accordance with this specification and in
accordance with the provisions governing qualification specified in SD-6.
4.4 Conformance inspection. Conformance tests shall consist of examinations and tests
4.4.1 Inspection lot. An inspection lot shall consist of turnbuckle component parts of the
same type, size, and material produced under the same manufacturing conditions. The unit of
inspection shall be one turnbuckle component part except for hardness and examination of
product.
4.4.2 Hardness sampling. The unit of inspection shall be one brass turnbuckle body per
stress relief batch.
4.5 Examinations.
4.5.1 Examination of product. Each sample part shall be examined for conformance to
the material, design, dimensional, protective treatment, marking, workmanship, and penetrant
inspection requirements of this specification and the applicable MS sheet.
4.5.2 Sampling. ASQ Z1.4 shall be used as a guide in the development of contractor's
statistical techniques to assure the components meet all requirements specified herein.
4.6 Tests.
4.6.1 Rotational movement. A turnbuckle assembly containing the sample component
part with a locking clip installed, shall be subjected to 10 percent of the applicable torque load
specified in table I, applied in a clockwise and counterclockwise direction. The total relative
angular rotation between the turnbuckle end and turnbuckle body (less the free play) from the
extreme of one direction (clockwise) to the extreme of the other (counterclockwise) shall be
measured for conformance to 3.7.1.
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