Rationale: AMS4236C adds provision for the specification to be used for investment castings (1.1), updates chemical analysis standards (3.1), provides for the use of integrally cast specimens (3.4.2, 3.6.1.2, 4.2.1, 4.3), when specified, clarifies approval requirements (4.4) and reports (4.5), and is a Five Year Review and update of this specification this revision.