Quality at Profab is built into every process step, not inspected in at the end. Our ISO 9001 and AS9100 certified system defines the processes, controls, and responsibilities that govern manufacturing operations. This guide walks through how that system actually works — not the certificates on the wall, but the daily mechanics that determine whether a board built in March is identical to one built in November.
The distinction matters because inspection alone cannot create quality. Inspection finds defects after they exist; a quality system prevents them from existing, and when one does occur, makes sure it is contained, understood, and permanently corrected. Every element described below — document control, training, traceability, corrective action, audits — exists to serve that single purpose.
What ISO 9001 and AS9100 Actually Require
ISO 9001 is the foundation: it requires documented processes, defined responsibilities, management review, competence records, supplier controls, and a closed corrective-action loop, all verified by an accredited third-party auditor. AS9100 layers the aviation, space, and defense industry’s additional demands on top — formal risk management, configuration management, first-article inspection practices, control of counterfeit parts, and stricter traceability.
The practical effect of holding both is that a single, unified system governs every job in the building. A commercial industrial controller and a defense avionics assembly flow through the same document control, the same training requirements, and the same nonconformance process. The paperwork depth may differ by contract; the discipline does not.
Process Control on the Floor
Every assembly is built to a controlled, revision-managed work-instruction package derived from the customer’s data. Operators build to the current revision — and only the current revision — because obsolete documents are physically and electronically withdrawn. Equipment carries calibration status; solder pastes and moisture-sensitive devices are handled per J-STD-033; process parameters like reflow profiles and wash chemistry are set by engineering and locked against casual change.
Workmanship is judged against IPC standards — IPC-A-610 for assemblies, J-STD-001 for soldering, IPC-A-600 for bare boards, IPC-7711/7721 for rework — and operator and inspector competence is documented and tracked, following the competence-record discipline ISO 9001 itself requires.
Documentation and Traceability
Traceability records link each assembly to its components, process parameters, and inspection results — supporting warranty administration, regulatory compliance, and field-issue investigation. The goal is that a serial number can be resolved, years later, into the component lots it contains, the process steps that built it, the inspection data it generated, and the revision of every document that governed the build.
Traceability also runs in reverse. If a component manufacturer issues an alert on a specific date code, traceability is what identifies every affected assembly and customer shipment — turning a potential fleet-wide question into a bounded, factual containment.
When Something Goes Wrong: The Corrective-Action Loop
No manufacturing system prevents every nonconformance; mature ones refuse to waste them. A discrepant board triggers a documented nonconformance report, segregation, and disposition by qualified reviewers. Recurring or significant issues escalate to root-cause analysis — not “operator error” as a conclusion, but the process gap that allowed the error — followed by corrective action and, critically, verification that the fix actually worked.
- Contain — segregate suspect material and stop the escape path.
- Correct — disposition the affected units: rework, repair per IPC-7711/7721, or scrap.
- Prevent — fix the process, update the documents, retrain, and verify effectiveness over time.
A certificate tells you a system exists. The corrective-action log tells you whether it works — that is the first thing worth reading in any audit.
— Profab Engineering Team
Audits, Metrics, and Management Review
Internal audits cycle through every process area on a planned schedule, executed by trained auditors who do not audit their own work. Third-party surveillance audits verify the system annually, and customer audits are welcomed — scrutiny is how a system improves. Behind the audits sits a metrics discipline: first-pass yield, on-time delivery, supplier performance, and corrective-action aging are reviewed by management on a fixed cadence, with documented actions when trends drift.
The system also reaches beyond our own walls. Suppliers — component distributors, board fabricators, plating and coating services — are qualified, rated on delivered quality and on-time performance, and periodically re-reviewed, because a quality system that stops at the receiving dock protects only half the process. In a mature system, incoming inspection is sized to each supplier’s demonstrated performance: trusted, long-audited sources earn streamlined receiving, while new or higher-risk sources see deeper sampling until their record justifies otherwise.
What Customers Should Take From This
For engineering and sourcing teams evaluating a manufacturing partner, the lesson of this guide is to look past the certificate to the mechanics. Ask to see how a work instruction is revision-controlled, how an operator’s IPC certification is tracked, how a serial number resolves to its component lots, and how the last three corrective actions were closed. A partner with real answers to those questions has a quality system; a partner without them has a wall decoration. Ours is open for inspection — and that openness is itself part of the system.
