✈️ AS9100
AS9100 Rev D Anodizing Suppliers for Aerospace Finishing
Flight-critical aluminum rarely flies bare; it carries a Type II, Type IIB, or Type III anodic coating whose thickness and seal directly affect fatigue life and corrosion protection. AS9100 Rev D wraps the aerospace-specific controls (configuration management, risk-based planning, counterfeit-part prevention, first-article inspection) around an anodizing operation that feeds primes and tier suppliers. Understanding what Rev D adds beyond a commercial quality system is the difference between a clean source-inspection pass and a stop-ship.
AS9100NADCAPISO 9001
What AS9100 Rev D Adds On Top of ISO 9001 in a Finishing Line
AS9100 Rev D fully contains ISO 9001:2015 and then layers aerospace requirements on top. Inside an anodizing operation, the additions you feel most are clause 8.1.2 (configuration management), 8.1.3 (product safety), and the key-characteristic and critical-item handling that flow from the prime's drawing. When a print flags coating thickness as a key characteristic, Rev D requires that characteristic be specifically controlled, monitored, and reported, not just lumped into a pass/fail seal check.
Clause 8.5.1.3 covers production process verification, which for a special process like anodizing means documented process validation tied to a fixed parameter set: rack design, bath chemistry limits, current density profile, and seal time and temperature. Any change to a validated parameter triggers a documented re-verification. Rev D also pulls in 8.4 supplier control with teeth, so if the anodizer outsources stripping, masking, or seal chemistry, that sub-tier must itself meet flowed-down requirements.
The other Rev D fingerprint is risk-based thinking under clause 6.1 applied to the finishing process. A serious aerospace anodizer keeps a process FMEA that calls out failure modes such as burned coating from rack contact loss, incomplete seal causing field corrosion, or hydrogen embrittlement on cadmium-plated or high-strength steel fasteners run through caustic etch. That FMEA is not theater; it drives the inspection plan you ultimately receive.
Why AS9100 Almost Always Travels With NADCAP for Anodizing
Here is the honest part: AS9100 alone is rarely sufficient for aerospace anodizing. AS9100 certifies the quality management system around the shop, but it does not technically audit the chemical-processing line. The aerospace primes (Boeing, Airbus, Lockheed, RTX, GE, Honeywell) almost universally require NADCAP chemical-processing accreditation per AC7004 and the Pyrometry-and-chemical-processing checklist AC7108 in addition to AS9100. NADCAP auditors physically verify solution analysis frequency, rectifier calibration against AMS standards, thickness measurement method, and seal testing.
So when you source AS9100 anodizing for flight hardware, treat AS9100 as the system layer and NADCAP as the process layer. The combination is what satisfies a typical prime flowdown. An AS9100 shop without NADCAP can legitimately serve ground-support, tooling, and some non-flight applications, but it will usually fail to win a structural or engine flowdown on its own.
The specs you will see called out reflect this dual structure: AMS 2469 and AMS 2470 for sulfuric anodize, AMS 2468 for hardcoat, and MIL-A-8625F as the historical baseline, all of which NADCAP audits against. Confirm the shop's process scope inside its NADCAP accreditation matches the AMS spec on your drawing, because NADCAP accreditation is granular by process, not blanket.
First-Article Inspection and the AS9102 Package
On a new part number or after a significant change, Rev D drives a first-article inspection per AS9102 Rev B. For an anodized part this means the FAI report ties every drawing requirement, including the coating callout, type, class, thickness, and color, to an actual measured result with the measurement method identified. Form 3 of the AS9102 package lists the coating characteristic, the requirement, the result, and the inspection tool, and references the anodizer's process certification.
Because anodizing is destructive to verify fully, the FAI for coating thickness typically uses eddy-current readings at defined locations plus, where required, a sacrificial coupon processed in the same load for cross-section or coating-weight verification. The FAI also captures the seal-quality test result (dye stain per ASTM B136 or admittance per ASTM B457) and any salt-spray requirement. Expect the package to reference the lot, the rack, and the process run record so the whole chain is reconstructable.
A buyer who skips reviewing the actual FAI numbers and just files the package is leaving risk on the table. Read Form 3, confirm the coating thickness landed comfortably inside tolerance rather than on the edge, and confirm the seal test passed by the method your spec requires, not a substitute method the shop preferred.
Frequently Asked Questions
For flight hardware, almost always yes. AS9100 Rev D certifies the quality management system surrounding the shop, including configuration management, key-characteristic control, and AS9102 first-article inspection, but it does not technically audit the anodizing line itself. The aerospace primes such as Boeing, Airbus, Lockheed, RTX, GE, and Honeywell typically require NADCAP chemical-processing accreditation per AC7004 and AC7108 on top of AS9100, because NADCAP auditors physically verify solution analysis frequency, rectifier and pyrometry calibration, thickness measurement, and seal testing against AMS specs. An AS9100-only anodizer can serve ground support, tooling, and some non-flight work, but it will usually fail to win a structural or engine flowdown without NADCAP. Treat AS9100 as the system layer and NADCAP as the process layer; the combination is what satisfies a standard prime flowdown for anodized aluminum.
The common aerospace callouts are AMS 2469 and AMS 2470 for sulfuric anodize, AMS 2468 for hardcoat anodize, and MIL-A-8625F as the historical baseline that still appears on legacy drawings as Type I (chromic), Type II (sulfuric), and Type III (hardcoat). Chromic acid anodize (Type I) shows up on fatigue-critical and adhesive-bond structure because it produces a thinner coating with less fatigue debit. Which spec applies is set by the prime's drawing, not the shop's preference. Critically, confirm the specific spec on your print is inside the shop's NADCAP accreditation scope, because NADCAP is granular by process, so a shop accredited for sulfuric anodize per AMS 2470 is not automatically accredited for chromic or hardcoat. Ask for the NADCAP certificate and read the process list before assuming coverage.
The AS9102 Rev B package ties every drawing requirement to an actual measured result. Form 1 identifies the part and references the documents; Form 2 covers materials, special processes, and functional testing, where the anodizing process certification and spec are recorded; and Form 3 lists each characteristic including the coating callout, type, class, thickness, and color, with the requirement, the measured result, and the inspection tool used. For coating thickness, expect eddy-current readings at defined locations and, where required, a sacrificial coupon run in the same load for cross-section or coating-weight verification, since anodizing cannot be fully verified non-destructively. The package also captures the seal-quality result by the specified method, dye stain per ASTM B136 or admittance per ASTM B457, plus any salt-spray requirement per ASTM B117. Review the actual numbers on Form 3 rather than just filing the package.
Aerospace anodizing under AS9100 plus NADCAP runs meaningfully higher than commercial work, often a substantial premium driven by lot traceability, configuration control, FAI on new part numbers, and the lower throughput of carefully racked flight hardware. On a new part number, budget extra calendar time for the first-article cycle, which can add one to several weeks before production releases depending on the prime's source-inspection requirements. Steady-state lead times for established aerospace anodize lots commonly run two to four weeks, longer than the one-to-two-week commercial norm, because of inspection, documentation, and the queue behind other controlled work. If your part requires source inspection or a Government Source Inspection stamp, factor in scheduling the inspector. The cost is real, but it is the price of a traceable, validated coating on hardware where a corrosion or fatigue failure is not recoverable.
Yes, and this is one of the clearest reasons to specify AS9100 for finishing. When a drawing flags coating thickness as a key characteristic or critical item, Rev D clause 8.1.2 and the key-characteristic provisions require that the parameter be specifically planned, controlled, monitored, and reported rather than absorbed into a generic pass/fail seal check. In practice the shop sets a validated current-density and dwell window to land thickness inside tolerance, measures at defined locations with a calibrated eddy-current gauge, and records the actuals against the requirement, often with statistical monitoring if volume warrants. The process FMEA driven by clause 6.1 will list under-thickness and over-thickness as failure modes with corresponding controls. Confirm on the drawing that thickness is actually flagged as a key characteristic, because if it is not, the shop controls it to general tolerance rather than the tighter key-characteristic regime, and you may want to add the flag yourself.
Last updated: July 2026
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