✈️ AS9100
AS9100 Rev D Heat Treating for Aerospace Hardware
Aerospace primes do not buy a hardness number; they buy a controlled, traceable thermal process with no room for a missing record. AS9100 Rev D is the quality framework that wraps that discipline around a heat treater serving the supply chain, building on ISO 9001 with aviation-specific clauses that turn an audit into a deep dive on risk, configuration, and counterfeit prevention.
AS9100NADCAPISO 9001
How Rev D Goes Beyond a Baseline 9001 System
AS9100 Rev D contains the full text of ISO 9001:2015 and then adds aviation, space, and defense requirements on top, so every 9001 control is present but extended. The clauses that bite hardest for a heat treater are 8.1.4 prevention of counterfeit parts, 8.5.1.3 verification and control of production process changes, 8.5.2 identification and traceability with a configuration-management discipline, and the Rev D emphasis on operational risk under Clause 8.1.1. For thermal processing this means a furnace recipe change is not an operator's call; it is a controlled change with impact assessment and customer notification where the contract requires it.
Product safety and key characteristics get explicit treatment in Rev D, so the heat treater must flow down and protect any KC the prime designates, such as core hardness on a landing-gear forging or case depth on a transmission gear. First Article Inspection per AS9102 is supported by the heat treater's records even when the FAIR is owned by the machining house, because the thermal results feed the article's verification.
The upshot is that a Rev D heat treater runs a heavier documentation and risk regime than a commercial 9001 shop. That overhead is the point: aerospace failures are catastrophic and the system is designed to make undocumented work impossible to hide.
Where AMS 2750 and NADCAP Fit the Picture
AS9100 by itself does not guarantee compliant pyrometry. The actual furnace-control rigor for aerospace heat treating comes from AMS 2750 (currently Rev F in wide use), which governs thermocouple types and usage, system accuracy tests, temperature uniformity surveys, and instrumentation classes. Most aerospace primes additionally require NADCAP Heat Treating accreditation audited against AC7102 and its checklists, which verify AMS 2750 conformance in practice on the shop floor.
So the cert stack a buyer should expect on a critical aerospace part is typically AS9100 (the quality system) plus NADCAP Heat Treating (the special-process accreditation) plus the prime's own approved-process-source listing. AS9100 without NADCAP is common at integrators who outsource thermal work, but the heat treater performing the furnace cycle itself should carry NADCAP if the spec or prime requires it.
Verify which TUS qualified temperature range and which furnace class your part needs. A shop NADCAP-accredited for a 1200 to 1400 F tempering range is not automatically qualified to run a 1950 F solution treat on a nickel alloy. Scope is per-furnace and per-temperature-range, not blanket.
Counterfeit and Material Traceability Controls
Rev D's counterfeit-prevention clause is unusually consequential for heat treating because thermal processing can mask or be blamed for material problems. A compliant shop controls incoming identification, segregates lots, and refuses to process material lacking pedigree. For raw bar or forgings supplied to the heat treater, full mill traceability back to the melt source is expected, and the shop's records must keep that linkage intact through the furnace operation.
This matters most on alloys where substitution is dangerous and tempting: aerospace 4340, 300M, 15-5PH and 17-4PH stainless, Inconel 718, and Ti-6Al-4V. A counterfeit or mislabeled lot run through the correct cycle will still fail in service, so the system has to catch it before the furnace, not after. The heat treater's traveler should carry the heat or lot number forward onto the cert of conformance.
Buyers should require that certs reference the incoming material identification and that the shop can produce its receiving inspection and segregation records on audit. A Rev D system that cannot reconnect a finished lot to its incoming heat number has a traceability gap that an aerospace customer will treat as a finding.
Records and FAIR Support You Should Demand
An AS9100 heat treater should deliver a certificate of conformance citing the applicable AMS or prime spec, the achieved metallurgical results with measured values, the furnace and load identification, and the material lot traceability. For solution-treat-and-age cycles on PH stainless or nickel alloys, expect the specific condition achieved (for example H1025 on 15-5PH) and the supporting hardness or, where required, conductivity data.
Where a First Article Inspection is in play, the heat treater's data must support the AS9102 forms, so coordinate early on what the machining house or prime needs back. Retention is typically driven by contract and can run the life of the program plus years, far longer than a commercial shop's default. Confirm retention terms in the PO for long-life airframe and engine programs.
If recorder charts, SAT and TUS records, or thermocouple usage logs are required as objective evidence, state that in the PO. A mature Rev D shop produces these without friction; resistance to producing pyrometry evidence is itself a warning sign on aerospace work.
Frequently Asked Questions
Usually not by itself. AS9100 Rev D gives you the quality-management system, risk controls, configuration management, and counterfeit-prevention discipline, but it does not directly enforce the pyrometry regime that aerospace thermal processing demands. That comes from AMS 2750 and, in practice, from NADCAP Heat Treating accreditation audited under AC7102. For most prime-flow-down parts you will see a stacked requirement: AS9100 for the system, NADCAP for the special process, and the prime's own approved-source listing for the specific operation. An AS9100-only supplier is fine as an integrator that outsources furnace work to a NADCAP house, but the shop actually running the cycle on a flight-critical part should hold NADCAP unless the governing spec explicitly says otherwise. Always confirm the cert stack against the engineering drawing and the prime's quality clauses rather than assuming AS9100 covers everything.
Expect both to run higher than a commercial ISO 9001 job, and budget for it. The documentation load alone, configuration control, traceability, KC monitoring, and FAIR support, adds real labor that shows up in the quote, often a meaningful premium over commercial rates for the same furnace cycle. Lead times stretch because aerospace work is scheduled around qualified furnaces with current TUS coverage, lot segregation is stricter, and record packages take time to compile. A routine aerospace temper or stress relief might still turn in roughly a week, but solution-treat-and-age cycles on PH stainless or nickel alloys, plus the documentation, commonly run two to three weeks. First-article runs take longer still because of FAIR coordination. The honest guidance: do not price or schedule aerospace heat treat like commercial work, and build the record-package time into your plan rather than treating it as an afterthought.
They answer different questions. AS9100 is a company-wide quality-management certification: it asks whether the organization runs a controlled, risk-managed, traceable system meeting aerospace requirements, and it is audited by an accredited certification body on a surveillance cycle. NADCAP is a special-process accreditation: it asks whether this specific thermal process, on these furnaces, in these temperature ranges, conforms to AMS 2750 and the relevant industry and prime requirements, and it is audited by metallurgically qualified auditors against the AC7102 checklists. A shop can hold AS9100 without NADCAP, and that is normal for integrators who do not run their own furnaces. But for the supplier actually performing the heat treat on aerospace hardware, primes typically require both: AS9100 for the management system and NADCAP for the process. Treat them as complementary, not interchangeable, and verify the NADCAP scope covers your alloy's temperature range.
Full pedigree, intact through the furnace operation. Under Rev D's traceability and counterfeit-prevention clauses, the shop must identify and segregate incoming lots, refuse material lacking proper documentation, and carry the heat or lot number forward onto the finished cert of conformance. For controlled aerospace alloys such as 4340, 300M, 15-5PH, 17-4PH, Inconel 718, or Ti-6Al-4V, you should be able to trace a finished part back to the original mill melt source through the heat treater's records. Practically, the cert you receive should reference the incoming material identification, and on audit the shop should produce receiving inspection, segregation, and lot-control records. If a supplier cannot reconnect a processed lot to its incoming heat number, that is a traceability gap an aerospace customer will flag. For high-consequence programs, state retention terms in the PO, since records are often required for the program life plus a defined number of years.
Last updated: July 2026
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