🔥 NADCAP
NADCAP Accredited Special-Process Suppliers in Indianapolis, IN
A perfectly machined aerospace part is worthless if its heat treat or nondestructive testing was done by an unaccredited vendor, because the prime will reject the whole lot at audit. NADCAP accreditation is the industry's answer to that risk, and in a propulsion town like Indianapolis the accredited special-process base runs deeper than most buyers expect. ManufacturingBase lets you map that base so no link in your process chain becomes the gap.
NADCAPAS9100ISO 9001
NADCAP, the National Aerospace and Defense Contractors Accreditation Program, is administered by the Performance Review Institute and exists to accredit special processes, those whose results cannot be fully verified by inspecting the finished part. Heat treating, chemical processing, nondestructive testing, welding, surface enhancement, and coatings all fall in this category. You cannot look at a heat-treated bracket and confirm the metallurgy is right; you have to trust the process was controlled. NADCAP audits that process control to a depth far beyond general quality certification.
This is why NADCAP is mandatory rather than optional in aerospace. The major primes, including the engine OEMs that anchor Indianapolis, require NADCAP accreditation on the special processes in their supply chains and flow that requirement down through every tier. A machine shop can hold AS9100 and still create a nonconformance if it routes heat treat to a non-accredited vendor, because the flight-hardware requirement attaches to the process, not just the part.
For a buyer, the mental model is that NADCAP accreditation is process-specific and granular. A supplier is not 'NADCAP accredited' in the abstract; it is accredited for pyrometry, for specific NDT methods like fluorescent penetrant or radiography, for particular chemical processing specs. Matching the exact accreditation to your part's process requirements is the whole game.
Reading an eAuditNet Listing Correctly
NADCAP maintains its own public verification system: eAuditNet, operated by the Performance Review Institute. Every accredited supplier and its specific accreditations are listed there, and you should verify directly rather than trusting a supplier's claim. Ask the Indianapolis supplier which commodities and which specifications they are accredited for, then confirm each against eAuditNet. The listing shows the supplier, the accredited special processes, and the merit status that reflects audit performance over time.
Granularity is everything when reading these listings. NADCAP accreditation is broken down by commodity, heat treating, materials testing, NDT, chemical processing, coatings, welding, and within each by specific processes and customer specifications. A supplier accredited for fluorescent penetrant inspection is not automatically accredited for radiographic inspection. Confirm the exact method and the exact specs your drawing calls out, because a near-match is a non-match in aerospace.
Merit status is a second signal worth reading. The program rewards consistent audit performance with longer accreditation cycles, so a supplier on a merit cycle has a track record of clean audits. A supplier repeatedly on the short cycle, or with a recent accreditation lapse, warrants a closer look. For Indianapolis buyers building a process chain, walking eAuditNet listing by listing for each subcontractor is the diligence that prevents a flow-down surprise at the prime's source-inspection gate.
Building a Complete Accredited Chain Around Indianapolis
Aerospace parts rarely touch a single special process. A machined engine component might require heat treat, then NDT, then a coating, each a separate NADCAP commodity, each needing an accredited source. The buyer's real task is assembling a chain where every special-process step is covered, and where the AS9100 machine shop coordinating the work maintains a controlled approved-supplier list of NADCAP processors. The Indianapolis region's propulsion heritage means many of these accredited processors cluster locally, which keeps the chain geographically tight.
Proximity in this context is not just convenience; it shortens the logistics of moving in-process flight hardware between operations and reduces the schedule risk of multi-state routing. When heat treat, NDT, and coating sit within a drivable radius of the machine shop, a part moves through its process chain faster and with fewer handoff opportunities for damage or paperwork loss. For energy and heavy-equipment buyers who also need accredited processing, the same local density applies.
The coordinating shop's role is critical. A capable Indianapolis AS9100 machine shop will own the special-process flow-down: it qualifies its NADCAP processors, audits them, and presents the buyer with a controlled chain rather than a list of names to chase. Asking a prospective machine shop how it manages its NADCAP supplier base tells you whether it will hand you a managed chain or a flow-down gap.
Where Buyers Get NADCAP Flow-Down Wrong
The most common mistake is assuming AS9100 covers special processes. It does not. AS9100 is the quality management system; NADCAP accredits the special processes within it. A buyer who confirms AS9100 and stops has verified the machine shop's quality system while leaving the heat treat and NDT unverified, exactly the gap a prime's auditor will find. The two requirements are complementary, not substitutes, and both must be confirmed independently.
A second pitfall is specification mismatch. Aerospace drawings call out specific process specifications, an AMS heat-treat spec, a particular NDT method and acceptance class, a defined chemical-processing spec, and the processor must be NADCAP accredited for that exact specification. Accepting a processor accredited for a 'similar' spec is a quiet nonconformance that surfaces during audit. The fix is disciplined: list every special-process spec on your drawing and confirm each one against eAuditNet for the assigned processor.
The third gap is treating accreditation as static. NADCAP accreditations have expiration dates and can lapse, and a processor accredited when you qualified it may have fallen off by the time your production run executes. Building a periodic re-verification step, re-checking eAuditNet at each production lot for active programs, closes a gap that otherwise opens silently over the life of a contract. ManufacturingBase helps by letting you filter and revisit NADCAP-accredited suppliers in the Indianapolis market as your program runs.
Frequently Asked Questions
NADCAP, the National Aerospace and Defense Contractors Accreditation Program administered by the Performance Review Institute, accredits special processes, those whose results cannot be fully verified by inspecting the finished part. Heat treating, chemical processing, nondestructive testing, welding, surface enhancement, and coatings all qualify, because you cannot look at a heat-treated component and confirm the metallurgy is correct; you have to trust the process was controlled. NADCAP audits that process control far more deeply than general quality certification does. It is required rather than optional because the major aerospace primes, including the engine OEMs anchoring Indianapolis, mandate NADCAP accreditation on the special processes in their supply chains and flow that requirement down through every tier. The critical nuance for buyers is that accreditation is process-specific and granular: a supplier is not 'NADCAP accredited' in the abstract but accredited for pyrometry, for specific NDT methods like fluorescent penetrant or radiography, for particular chemical-processing specifications. A machine shop can hold AS9100 and still create a nonconformance by routing heat treat to a non-accredited vendor, because the flight-hardware requirement attaches to the process itself, not just the finished part.
Use eAuditNet, the public verification system operated by the Performance Review Institute, rather than trusting a supplier's claim. Ask the Indianapolis supplier which commodities and which specific specifications they are accredited for, then confirm each one directly against the eAuditNet listing, which shows the supplier, its accredited special processes, and its merit status. Granularity is everything here: NADCAP accreditation is broken down by commodity, heat treating, materials testing, NDT, chemical processing, coatings, welding, and within each by specific processes and customer specifications. A supplier accredited for fluorescent penetrant inspection is not automatically accredited for radiographic inspection, so confirm the exact method and the exact specs your drawing calls out, because a near-match is a non-match in aerospace. Also read the merit status: the program rewards consistent clean audits with longer accreditation cycles, so a supplier on a merit cycle has a strong track record, while one repeatedly on the short cycle or with a recent lapse warrants closer scrutiny. For a buyer building a multi-step process chain, walking eAuditNet listing by listing for each subcontractor is the diligence that prevents a flow-down surprise at the prime's source-inspection gate.
No, and this is the single most common flow-down mistake buyers make. AS9100 is the quality management system; NADCAP accredits the special processes within that system. They are complementary requirements, not substitutes, and both must be confirmed independently. A buyer who verifies a machine shop's AS9100 certificate and stops has confirmed the quality system while leaving the heat treat, NDT, and coatings entirely unverified, which is exactly the gap a prime's auditor will find and reject the lot over. The requirement attaches to the process: even an AS9100-certified shop creates a nonconformance if it routes a special process to a vendor that lacks the matching NADCAP accreditation. A related pitfall is specification mismatch, aerospace drawings call out specific process specifications such as an AMS heat-treat spec or a defined NDT method and acceptance class, and the processor must be accredited for that exact specification, not a similar one. The disciplined fix is to list every special-process spec on your drawing and confirm each against eAuditNet for the assigned processor. Verify the quality system and the special-process accreditations separately, every time.
The driver is propulsion. Rolls-Royce's large engine operations in Indianapolis and the surrounding aerospace supply base create steady demand for NADCAP-accredited special processes, and decades of that demand have clustered accredited heat treat, NDT, chemical processing, and coating capacity in the region. For a buyer, the benefit is the ability to assemble a complete accredited process chain within a tight geographic radius. Aerospace parts rarely touch a single special process, a machined engine component might need heat treat, then NDT, then coating, each a separate NADCAP commodity needing an accredited source, and having those processors local shortens the logistics of moving in-process flight hardware between operations while reducing the schedule risk of multi-state routing. Fewer handoffs across shorter distances means fewer opportunities for damage or paperwork loss. The Indianapolis ecosystem also tends to feature capable AS9100 machine shops that own the special-process flow-down: they qualify and audit their NADCAP processors and present the buyer with a controlled, managed chain rather than a list of vendors to chase. Energy and heavy-equipment buyers needing accredited processing benefit from the same local density. ManufacturingBase lets you filter and re-verify these accredited suppliers as your program runs.
Last updated: July 2026
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