AS9100 Aerospace Casting Suppliers

Karl Gillihan

✈️ AS9100

AS9100 Rev D Casting Suppliers for Aerospace: Frozen Process Control on Investment and Sand Castings

When a turbine bracket or a structural airframe fitting starts as a casting, the foundry's AS9100 Rev D registration is what stands between you and an escape into a flying assembly. Built on ISO 9001 but written for the aviation, space, and defense supply chain, the standard adds configuration control, frozen process planning, and first-article rigor that a commercial foundry simply does not carry.

AS9100NADCAPISO 9001

The defining feature AS9100 adds over ISO 9001 is the idea that once a casting process is qualified, it is frozen. Clause 8.5.1 in the AS9100 Rev D text requires control of the production process including the gating and risering, the wax-injection parameters for investment shells, the dewax and shell-fire schedule, the alloy and remelt ratio, and the pour temperature. Once first article is approved, the foundry cannot change a runner, swap a shell slurry, or move to a different furnace without a formal change notice and, in most cases, customer notification and requalification. This is the aerospace doctrine of 'no silent changes,' and it is why aerospace castings cost more. Configuration control under clause 8.1.2 means every revision of the part, the pattern or tooling, and the process specification is tied together with effectivity dates. When an engineering change comes down from the OEM, the foundry must show which heats were poured to the old configuration and which to the new. For a buyer, the practical test is to ask how the foundry would handle moving a casting from one of its furnaces to another. The correct answer involves a change request, impact assessment, and likely a re-FAI, not 'we just run it.'

Counterfeit Material and Special-Process Risk Unique to Aerospace Casting

AS9100 Rev D introduced explicit clauses that bite hard in a foundry. Clause 8.1.4 (prevention of counterfeit parts) extends to raw alloy: the foundry must control its incoming ingot and master alloy to prevent uncertified or misrepresented material entering the melt. For a vacuum-melted superalloy casting in Inconel 718 or a single-crystal nickel blade, the provenance of the revert and virgin charge is a controlled item, not a commodity buy. Clause 8.1.3 (product safety) requires the foundry to identify and manage safety-critical characteristics flowed down from the OEM, and clause 8.4 forces it to control externally provided special processes. In casting, the heavy hitters here are heat treatment, hot isostatic pressing (HIP) to close internal microporosity, chemical etch and fluorescent penetrant inspection, and radiography. Each of these is almost always a NADCAP-accredited special process, and AS9100 requires the foundry to verify its sub-suppliers hold that accreditation. A casting buyer should expect the foundry to maintain an approved supplier list with the NADCAP scope and expiry of every special-process house it uses.

How AS9100 and NADCAP Divide the Work

Buyers routinely confuse these two, and the distinction matters when you vet a casting foundry. AS9100 is the quality management system standard for the whole company; NADCAP is process-specific accreditation for the special processes performed inside or alongside casting. A foundry can be AS9100 registered yet still need NADCAP accreditation for its in-house heat treat, welding (for upgrade/repair of castings), fluorescent penetrant, and radiography lines, because most aerospace primes flow down both requirements through their own supplier quality manuals. The clean way to read a foundry's qualification stack is: AS9100 covers the management system and contract review; NADCAP covers whether the actual furnace pyrometry, penetrant process line, and X-ray technique meet the AC7000-series checklists. For a structural casting you typically want both, plus the foundry's listing on the OEM's approved source list for that part family. AS9100 alone, with no NADCAP on the embedded special processes, is a gap that an aerospace prime's source inspection will catch.

First Article Inspection to AS9102 and the Records That Travel

AS9100 mandates first article inspection per AS9102, and for a casting this is more than a dimensional layout. The AS9102 package uses three forms: Form 1 captures part identification and the configuration, Form 2 records the material and special-process certifications including the heat number, alloy spec, heat-treat lot, and NDT records, and Form 3 is the balloon-to-characteristic accountability where every feature on the print is verified against an actual measurement. A casting FAI must reconcile the as-cast and as-machined characteristics and capture the gating and chill locations if they are controlled features. With production parts, expect a certificate of conformance, the heat chemistry, mechanical properties from the keel block or separately cast test bars, the HIP and heat-treat certifications, and the penetrant and radiographic reports with technique sheets and acceptance to the OEM's casting specification (commonly an AMS or a company spec invoking ASTM E155 reference radiographs). Clause 8.5.2 traceability means each casting carries an identity that resolves back to that whole record set. Retention is typically driven by the OEM contract and can run the life of the program plus years.

Frequently Asked Questions

For most flight-hardware castings you need both, and they cover different things. AS9100 Rev D certifies the foundry's overall quality management system: contract review, configuration control, frozen process planning, counterfeit-material prevention, and first-article inspection. NADCAP accredits the specific special processes that determine whether the casting is metallurgically sound, namely heat treatment, hot isostatic pressing, fluorescent penetrant inspection, radiography, and any welding used for upgrade or repair. An AS9100 foundry is required to control these processes, but the prime usually flows down a separate requirement that the processes themselves be NADCAP-accredited, whether performed in-house or at a sub-supplier. So the realistic answer is that AS9100 governs how the foundry runs, and NADCAP proves the metallurgy-critical steps meet the audited checklists. Ask for both certificates, confirm the NADCAP scope actually lists the processes used on your part, and verify the part appears on the OEM approved source list where one exists.

In AS9100 casting, frozen process means that once first-article approval is granted, the qualified process parameters become locked: the gating and risering design, the wax injection and shell-build sequence for investment castings, the alloy charge make-up and remelt ratio, the pour temperature, and the heat-treat and HIP recipes. The foundry cannot change any of these without a formal change request, impact assessment, customer notification, and frequently a re-qualification or partial re-FAI. This discipline is what protects you from silent variation, but it has cost and schedule consequences. Initial qualification of a new aerospace casting can take twelve to twenty-four weeks through tooling, process trials, first article, and source inspection, far longer than commercial work. It also means you cannot ask the foundry to 'just tweak' a runner to improve yield mid-program without triggering paperwork and cost. The upside is repeatability: a frozen process delivers castings that behave identically lot after lot, which is exactly what flight qualification depends on.

AS9100 Rev D clause 8.1.4 on counterfeit-part prevention and clause 8.4 on control of externally provided processes together force tight control over charge material. For a vacuum-melted nickel superalloy casting such as Inconel 718, MAR-M-247, or a single-crystal blade alloy, the foundry must control the provenance of both virgin master alloy and any internally generated revert, including segregating and analyzing remelt and limiting revert ratios per the customer specification. Each heat is verified by chemistry, typically by inductively coupled plasma or combustion analysis for trace elements that matter in superalloys, and gas content is checked because nitrogen and oxygen pickup degrades casting integrity. The foundry must retain the master-alloy certifications and tie them to the heat number on every casting. For a buyer, the practical verification is to ask to see a sample heat record: it should trace from the master-alloy supplier certificate, through the melt analysis, to the parts poured. If the foundry treats ingot as a commodity with no provenance trail, it is not running an AS9100-compliant superalloy operation.

The AS9102 package is built on three standardized forms. Form 1 is the part-number accountability sheet identifying the part, its revision, the drawing, and the configuration baseline. Form 2 is the product accountability sheet listing material and special-process certifications, which for a casting includes the alloy specification, the heat number and chemistry, the heat-treat and HIP lot certifications, and the nondestructive test records for penetrant and radiography. Form 3 is the characteristic accountability sheet, where every dimension and note on the drawing is balloon-numbered and matched to an actual measurement result, including as-cast features that are controlled characteristics such as wall thickness, chill locations, or gate stubs. For castings, the FAI must reconcile as-cast and as-machined states and capture key characteristics flagged by the OEM. A complete package lets a source inspector trace any feature on the part back to a verified record. AS9100 clause 8.5.1.3 requires re-accomplishing the FAI when the process, tooling, or a lapse in production triggers it, so the package is a living document, not a one-time event.

AS9100 certificates are issued through the aerospace exclusive program, so the strongest verification is the OASIS database (the Online Aerospace Supplier Information System) maintained by the IAQG. Every legitimate AS9100 certification is recorded there with the supplier's name, certificate status, certification body, audit dates, and the scope of certification. Look up the foundry, confirm the certificate is active rather than suspended or expired, and read the scope statement to confirm it explicitly covers the casting process and product types you are buying, not just machining or assembly. Cross-check the certification body is itself accredited and accepted under the IAQG scheme. Beyond OASIS, ask the foundry directly for the date of its last surveillance audit and any open major nonconformances, and confirm whether the OEM you are supplying maintains its own approved source list that the foundry must appear on. A foundry that is AS9100 registered but absent from the relevant prime's source list still cannot ship qualified hardware for that program.

Last updated: July 2026

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