MIL-PRF-23256C
3.9 Workmanship. The seal valve assembly shall be uniform in quality and shall be free from
irregularities and defects which could affect safety, performance, reliability, or durability.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall consist of all the examinations and
tests specified in table I (listed sequence mandatory).
4.2.1 First article samples. Unless otherwise specified in the contract, after the award of the
contract or order, the manufacturer shall submit four complete seal valve assemblies (samples A
through D in table I). The samples shall be representative of the design and constructions,
workmanship, integral components and materials to be used for production. When a
manufacturer is in continuous production of these units from contract to contract, submission of
further first article samples on the new contract may be waived at the discretion of the acquiring
activity (see 6.2). Approval of the first article samples or the waiving of first article inspection
does not preclude the requirements of submitting samples to the conformance inspection. The
first article inspection samples shall be furnished to the Government as directed by the contracting
officer (see 6.2).
4.3 Conformance inspection. Conformance inspection shall be as specified in table II (listed
sequence mandatory). All samples shall be subjected to Group 1 tests followed by Group 2 tests.
Any redesign or modification of the contractor's standard valve to comply with specified
requirements, or any redesign or modification following failure to meet the specified requirements
shall be approved by the acquisition activity prior to retesting the sample. This element of
inspection shall pass all visual examinations and dimensional requirements. Noncompliance with
any specified requirements or presence of one or more critical defects shall constitute cause for
rejection of the lot.
4.3.1 Sampling.
4.3.1.1 Inspection lot. An inspection lot size shall be expressed in units of seal valve
assemblies made essentially under the same conditions and from the same materials and
components. The sample unit shall be one seal valve assembly.
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