MIL-A-21180D
his own or any other facilities suitable for the performance of the inspection requirements
specified herein, unless disapproved by the Government. The Government reserves the right to
perform any of the inspections set forth in the specification where such inspections are deemed
necessary to assure supplies and services conform to prescribed requirements.
4.1.1 Certification of quality compliance. Certificates of quality compliance (see 6.2.2) shall
be prepared for each lot of material offered for acceptance. The certificate shall include results of
specified chemical and mechanical tests. Qualitative results of nondestructive tests and other
inspections or tests shall be recorded on the certificate. The certificate shall also state that each
lot has been sampled, tested, and inspected in accordance with the specification and meets all
requirements. The certificate shall be signed by a responsible representative of the contractor, and
shipped with the lot.
4.2 Classification of inspection. The inspection requirements specified herein are classified
as follows:
a. First article inspection (see 4.3).
b. Quality conformance inspection (see 4.4).
4.3. First article inspection. First article inspection for foundry control shall consist of all the
requirements of this specification.
4.3.1 First article sample. A first article sample shall consist of two castings, solution heat
treated, straightened and aged to drawing requirements and submitted for inspection and approval
as directed by the purchaser. One casting shall be identified as the "dimensional sample" and shall
be for dimensional approval. The other casting shall be identified as, "foundry control sample"
and shall be subjected to composition, X-ray, mechanical property, and other tests and inspections
as necessary for approval (see 6.2.1 and 6.3).
4.4 Quality conformance inspection. This inspection shall consist of all tests and inspections
specified in 4.5.
4.4.1 Inspection lots. Inspection lots shall be classified as melting lots or casting lots as
defined herein.
4.4.1.1 Melting lot (heat). A melting lot, hereinafter named "heat", shall be one batch of
alloy melted then poured within a substantially brief and continuous time period (8 hours). The
unit of inspection shall be the heat itself.
4.4.1.2 Casting lot. Unless otherwise specified (see 6.2.1), a casting lot shall consist of not
more than 1000 pounds of castings of the same part which are poured from a single heat and
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