An Explainer Guide — What Nadcap Accreditation Covers, How It Differs From AS9100, and Why Aerospace Primes Require It
An educational guide explaining Nadcap (National Aerospace and Defense Contractors Accreditation Program) special process accreditation — what it covers, how the audit process works, and why it sits alongside, rather than replaces, a quality management system like AS9100. Written for buyers and engineers trying to understand what a Nadcap-accredited special process supplier actually represents. Shivam Forge, Rajkot, India. Call +91-9265772827.
Nadcap — administered by the Performance Review Institute (PRI) on behalf of a council of participating aerospace and defense prime contractors — is frequently misunderstood as simply another quality certification comparable to ISO 9001 or AS9100, but it is structured quite differently in scope: rather than certifying a company's overall quality management system, Nadcap accredits specific 'special processes' at a specific facility, meaning a supplier can hold Nadcap accreditation for heat treatment, or for a particular non-destructive testing method, or for welding, chemical processing, or coatings — each evaluated and accredited separately against a detailed, process-specific checklist developed collaboratively by subject matter experts from the participating primes themselves. Special processes are singled out for this level of scrutiny because their conforming output typically cannot be verified by inspecting the finished part alone; a heat-treated component's grain structure and resulting mechanical properties, for instance, are a direct function of the furnace's actual temperature uniformity and cycle control during processing, not something a caliper or visual inspection after the fact can reliably confirm was correct. Nadcap audits are correspondingly rigorous and process-specific, conducted by auditors trained in that particular special process, checking furnace pyrometry survey records, procedure documentation, personnel qualification, and process control evidence against the detailed checklist for that process — a fundamentally different, narrower, and more technically granular exercise than a general quality management system audit. Understanding this distinction matters for any buyer evaluating a potential aerospace supply chain partner, since 'quality certified' and 'Nadcap accredited for heat treatment' are answering genuinely different questions.
A 'special process' is one where the conformance of the output cannot be fully verified by inspecting the finished item — heat treatment, non-destructive testing, welding, chemical processing, coatings, and composites processing are classic examples, since their success depends on the process itself being executed correctly, not on something visibly checkable afterward.
A supplier doesn't simply 'have Nadcap' as a blanket status — accreditation is awarded for specific process categories (for example AC7102 for heat treatment or AC7114 for non-destructive testing) at a specific facility, following an audit against that process's own detailed checklist.
Nadcap's audit checklists are developed and continuously refined by task groups made up of engineers from the participating aerospace primes themselves, meaning the criteria reflect what practising aerospace process engineers actually consider necessary for reliable special process control, not a generic auditor's checklist.
A key practical benefit of the shared, industry-run model is that a single Nadcap accreditation is recognized by the many aerospace and defense primes participating in the program, rather than each customer needing to conduct and maintain its own separate special-process audit of the same supplier.
AS9100 (built on ISO 9001 with aerospace-specific additions) evaluates a company's overall quality management system — how it plans, controls, documents, and improves its processes generally. Nadcap instead drills into the technical execution of one specific special process in detailed, process-engineering terms.
It's common for an aerospace prime to require AS9100 certification as a baseline quality system expectation for any supplier, and separately require Nadcap accreditation specifically for whichever special processes that supplier performs in-house — the two requirements address different risks and don't substitute for one another.
For heat treatment specifically, Nadcap accreditation (and the underlying AMS 2750 pyrometry specification it references) requires documented temperature uniformity surveys and system accuracy tests on each furnace at defined intervals, with results tied to the specific furnace load configurations actually used in production — a level of process-specific documentation a general quality audit would not typically probe in this depth.
For non-destructive testing special processes, Nadcap accreditation examines whether NDT personnel are qualified and certified to the appropriate level under a recognized personnel certification scheme, and whether written practice procedures and equipment calibration records genuinely support the inspection results being issued.
Nadcap — the National Aerospace and Defense Contractors Accreditation Program — occupies a distinctive and frequently misunderstood position in aerospace supply chain quality requirements. Where a general manufacturing quality certification like ISO 9001, or its aerospace-specific extension AS9100, evaluates how a company plans, documents, and controls its processes and continuous improvement at an organizational level, Nadcap does something narrower and more technically specific: it accredits individual 'special processes' — heat treatment, non-destructive testing, welding, chemical processing, coatings, composites, and several other categories — at a particular supplier facility, based on a detailed technical audit against a checklist built specifically for that process. Administered by the Performance Review Institute on behalf of a council of participating aerospace and defense prime contractors, Nadcap functions as a shared industry accreditation mechanism: rather than every aerospace prime separately auditing every supplier's heat treatment furnace practices, a single Nadcap accreditation for that process is recognized across the many primes participating in the program, meaningfully reducing duplicated audit burden industry-wide while maintaining a genuinely rigorous, technically informed bar.
The reason special processes specifically warrant this separate, more granular layer of accreditation traces back to a fundamental characteristic they share: unlike, say, a machined dimension that can be directly measured and verified as conforming or non-conforming after the fact, a special process's conformance is largely determined by how the process itself was executed, not by anything readily observable in the finished output. A heat-treated forging's actual grain structure, hardness distribution, and resulting mechanical properties are the direct consequence of the furnace's real temperature uniformity, the specific time-temperature cycle actually experienced by the load, and the quench or cooling parameters applied — none of which a post-treatment visual or dimensional inspection can reliably reconstruct or verify. This is precisely why Nadcap heat treatment accreditation (audited against the AC7102 checklist family, referencing the AMS 2750 pyrometry specification) probes furnace temperature uniformity survey records, system accuracy test history, and load configuration documentation in detail — verifying the process controls that actually determine whether the resulting material properties are trustworthy, rather than relying solely on downstream testing of finished parts.
For buyers evaluating a potential aerospace or defense supply chain partner, the practical implication is that 'ISO 9001 certified,' 'AS9100 certified,' and 'Nadcap accredited for [specific process]' are three genuinely different statements answering three different questions, and a supplier can legitimately hold any combination of them depending on what services it performs in-house. A forge shop performing its own heat treatment, for example, is the kind of facility where a customer might reasonably ask specifically about Nadcap heat treatment accreditation status, distinct from asking about its general quality management certification — since the special process accreditation speaks directly to the technical rigor of that specific, otherwise hard-to-verify-after-the-fact operation. Understanding this distinction helps buyers ask more precise, useful questions during supplier qualification, rather than treating 'certified' as a single undifferentiated category that any quality mark satisfies equally.
For engineering teams and buyers working through aerospace or defense component sourcing who want to understand exactly what special-process control and documentation a particular program requires — and how a given supplier's current quality system and process controls line up against it — Shivam Forge's engineering team approaches quality control with the same discipline of documented process control, furnace pyrometry, and traceable NDT records that special-process accreditation formalizes. Contact our engineering team at +91-9265772827 or sales@shivamforge.com with your program's specification and documentation requirements to discuss what's needed for your specific application.
Nadcap is an industry-run accreditation program, administered by the Performance Review Institute on behalf of participating aerospace and defense prime contractors, that accredits specific 'special processes' — such as heat treatment, non-destructive testing, or welding — at a specific supplier facility. It's not a general company-wide quality certificate; it's a detailed, process-specific technical audit against a checklist developed by industry process engineers.
No. AS9100 certifies a company's overall quality management system — planning, documentation, corrective action, and general process control across the business. Nadcap instead accredits the detailed technical execution of one specific special process at a time. Many aerospace supply chains require both: AS9100 as the baseline quality system expectation, and Nadcap specifically for whichever special processes a supplier performs.
Because the correctness of a special process's output typically can't be confirmed by inspecting the finished part afterward — a heat-treated component's actual mechanical properties depend on the furnace's real temperature uniformity and cycle control during processing, which isn't something a post-process inspection can reliably reconstruct. Nadcap's process-specific audits instead examine the process controls directly, such as furnace pyrometry survey records and procedure documentation.
Nadcap checklists are developed and maintained by task groups composed of engineers and technical experts from the participating aerospace and defense prime contractors themselves, working through the Performance Review Institute's industry-managed structure — meaning the criteria are written by the same community of process engineers who ultimately rely on the accredited suppliers' output.
This page is an educational explainer of what Nadcap accreditation is and how it works generally, written to help buyers and engineers understand the distinction between process-level accreditation and company-level quality certification — it isn't a claim of accreditation status for any specific supplier. If your program requires supplier accreditation to a specific special process, our engineering team is glad to discuss your particular documentation and process-control requirements directly and explain where our current quality system stands relative to them.
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Shivam Forge delivers precision hot-forged components from our integrated Shapar, Rajkot facility — covering forging, CNC machining, heat treatment, and quality inspection under one roof.
