MIL-A-21180D
SAE
AEROSPACE MATERIAL SPECIFICATIONS (AMS)
AMS 3025
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Polyalkylene Glycol Heat Treat Quenchant
(Application for copies should be addressed to SAE, 400 Commonwealth Drive, Warrendale,
PA 15096.)
NATIONAL AEROSPACE STANDARDS (NAS)
NAS 823
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Cast Surface Comparison Standard
(Applications for copies of this document should be addressed to National Standards
Association, Inc., 5161 River Road, Bethesada, MD 20816.)
(Industry association specifications and standards are generally available for reference from
libraries. They are also distributed among technical groups and using Federal agencies.)
2.3 Order of precedence. In the event of a conflict between the text of this specification and
the references cited herein, the text of this specification shall take precedence.
3. REQUIREMENTS
3.1 First article. Sample castings shall be subjected to first article inspection, unless such
inspection has been waived (see 3.2.1.1, 4.3, 6.2.1, and 6.3).
3.2 Foundry practice.
3.2.1 Process control approval.
3.2.1.1 Foundry control approval. Production of a given casting shall not begin until the
foundry control is approved. If temporary gating was used, castings shall be made with the gating
installed. The following shall be recorded where applicable: molten metal holding temperature,
pouring temperature, degassing procedure, grain refining and modification procedures, chill and
insulation sizes and locations, gating techniques and procedures, filtering techniques, and risering
techniques, procedures and locations. Approval of foundry control shall be based on the results
of first article inspection, unless such inspection has been waived (see 3.1). Where there is no
waiver of first article inspection, the foundry shall be required to use the same casting practice and
heat-treating procedure for the production castings as for the approved first article castings. If
necessary to make any change in production procedures (see 3.2.2), the foundry shall notify the
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