AS9100 Rev D is the aerospace quality management standard, and it applies to AM facilities serving the defense and aerospace supply chain. But it was written for traditional manufacturing. Applying it to additive processes requires interpretation—and not every auditor gets it the same way.
AS9100 Rev D builds on ISO 9001:2015, then layers on aerospace-specific clauses most other industries don’t care about. You need a functioning quality management system, but you also need to address foreign object debris control, counterfeit parts prevention, and configuration management. For AM shops, that means documenting your powder handling, material traceability, and build validation procedures in a way that satisfies aerospace auditors. The base ISO 9001 stuff you probably know. AS9100 adds about 10 additional clauses on top.
This clause requires production processes to be controlled and validated. For traditional CNC machining, that’s straightforward—thirty years of proven processes. For AM, you’re often the first facility validating that specific combination of machine, powder, parameters, and geometry. The auditor wants documented process parameters, validation data proving the process repeatably produces conforming parts, and statistical evidence your process is under control. Not theoretical. Actual data from qualification builds.
You can’t ship parts unless you’ve verified they meet acceptance criteria. For AM that means every part or statistically valid sample must be inspected before release. Inspection records must trace back to the build. Documented acceptance criteria for each part type. Raw material incoming inspection records retained. The auditor will pick a specific part and trace it back through the build file, build date, powder lot, and material certificate. If any link is missing, that’s a nonconformance.
Material traceability starts with your powder supplier. Verify that incoming powder meets specification—particle size distribution, chemical composition, apparent density, flow rate. All documented per the supplier’s certificate of analysis. Track which powder lot went into which build. When you’re reusing powder, document the initial lot number, how much was used in each build, what testing you ran on recycled powder, and how long it’s been in use. Many auditors will ask how many reuse cycles your powder can withstand. If you don’t have a defined limit, that’s a risk.
Before you produce a critical part, you need to qualify the process. Run test builds with the actual machine, parameters, and geometry. Inspect those parts—dimensional, surface, internal flaws via CT or sectioning. The validation report should include machine model and serial number, software version, exact parameters, material lot numbers, inspection results, date qualified, and who approved it. Every production build must use those exact parameters. Change the laser power from 200W to 210W without re-qualifying? That’s a nonconformance.
The auditor shows up with a checklist and a healthy dose of skepticism. Day one: they ask for your quality manual, a list of all active production processes and their validation status, then pull 3–5 recent part serial numbers at random. For each part, they want to see the order, the drawing, the build file, inspection records, and material certs. If you can’t produce a complete trail for all five, that’s a potential major nonconformance.
Bring your process validation files organized by part number or process name. Auditors want a controlled process specification document that’s revision controlled, dated, and signed off. The validation report with actual data. Ongoing statistical control data—SPC charts if you’re running multiple builds of the same part. Records of any process deviations and corrective actions. If your Cpk dropped from 1.67 to 1.33, you need a corrective action record showing what you investigated and how you fixed it.
The auditor will walk the floor. They’ll check whether powder cans are labeled with lot number and expiration date. How powder is stored—temperature, humidity, sealed containers. When the powder was opened and how long it’s been in use. Procedures for handling damaged or suspect powder. A log of powder reuse cycles. If your powder is sitting open in the machine for six weeks because no one tracked it, that’s a nonconformance. Powder absorbs moisture. It gets contaminated. You need controls.
AS9100 compliance for additive manufacturing requires documented process validation, material traceability, and technical detail that most quality consultants don’t understand about AM. We do. Let’s talk about where your facility stands and what qualification path makes sense.
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