What NADCAP covers and why finished-part inspection can't replace it
NADCAP, the National Aerospace and Defense Contractors Accreditation Program, is administered by the Performance Review Institute. It accredits special processes, operations whose conformance can't be reliably confirmed by inspecting the finished part. Heat treatment, chemical processing and finishing (anodize, plating, passivation), nondestructive testing (penetrant, magnetic particle, ultrasonic, radiographic), welding, and materials testing are the common ones for Provo aerospace and defense parts. You can't measure whether a heat-treat cycle hit the right soak temperature and quench rate by looking at the bracket; you have to trust the process, which is exactly why aerospace mandates accreditation of the process itself.
NADCAP audits are notably more rigorous and prescriptive than a general QMS audit. They assess against detailed Audit Criteria specific to each process family, performed by industry-expert auditors, and the accreditation is tied to the specific processes a supplier was assessed for, not a blanket stamp. A shop accredited for heat treatment is not thereby accredited for NDT.
For a Provo buyer, the practical reality is that NADCAP usually isn't a property of your machine shop, it's a property of the subtier processors your machine shop uses. Most Utah County machining and additive suppliers send special processes out, so the NADCAP question is really a supply-chain-mapping question.
Mapping the special-process routing on a Provo aerospace part
Before placing a controlled or flight-critical part, get the full process routing from your Provo machine shop: which operations happen in-house and which go to outside processors. A typical titanium aerospace bracket might be machined in Provo, sent out for stress relief or solution heat treat, returned for finish machining, sent out again for penetrant NDT and possibly a finish like anodize or passivation, then returned for final inspection. Each outside operation is a NADCAP touchpoint.
For every special process in that routing, identify the processor and confirm it holds current NADCAP accreditation for that specific process category. Salt Lake City and the broader Wasatch Front host several accredited processors, so much of a Provo part's routing can stay regional, but verify rather than assume. A shop may hold NADCAP for one process and subcontract another to a vendor whose accreditation you also need to check.
Under AS9100 the prime machine shop is responsible for controlling these subtiers, but as the buyer you carry the program risk if a part is rejected. Map the chain yourself, document each processor's accreditation, and make subtier NADCAP a written requirement in your PO. This is the single highest-leverage thing a Provo aerospace buyer can do to prevent receiving-dock rejections.
Verifying NADCAP accreditation and reading its scope
NADCAP accreditations are tracked through the Performance Review Institute and surfaced in the eAuditNet system, which lists accredited suppliers and their accredited process categories. Use it to confirm a processor's accreditation is current and, critically, to read which specific processes and process families it covers. A processor accredited for chemical processing may not be accredited for the specific finish your spec calls out; accreditation scope is granular.
Watch accreditation expiry and merit status. NADCAP accreditations are time-limited and renewed through reaudit, and suppliers with strong performance can earn longer merit-based cycles while those with findings stay on shorter ones. A current accreditation with no open findings is what you want behind a flight-critical process. Ask the processor for its accreditation certificate and confirm it against eAuditNet.
Also confirm the accreditation matches your customer's approved-source requirements. Some primes maintain their own approved-processor lists on top of NADCAP, so a NADCAP-accredited heat-treat shop might still need to be on your specific customer's qualified-source list. For Provo suppliers feeding a named defense or aerospace prime, reconcile NADCAP accreditation against that prime's flow-down approvals before committing.