Second-source manufacturing qualification

Define the continuity goal and equivalence criteria.

Clarify whether the additional source addresses capacity, disruption, a critical process, or dependence on one supplier. Identify interchangeable product requirements, functional performance, critical characteristics, and permitted differences. Geographic diversification is a separate decision from technical qualification.

• Identify affected part numbers, current revisions, and intended applications.
• Define acceptable differences and who has authority to approve them.
• Document risks that remain even with two suppliers sharing materials or subcontractors.

Align drawings, tooling, and critical inputs.

Release the same controlled baseline to the candidate and identify undocumented knowledge that affects production. Check whether tooling must be duplicated, adapted, or transferred, and review access and ownership arrangements. Materials, critical components, and substitutions need explicit approval rather than assumed equivalence.

• Compare drawing, CAD, process, and inspection revisions.
• Identify tool condition, fixture needs, and responsibility for modifications.
• Record critical input sources and any differences from the established route.

Verify the candidate production route.

Review relevant equipment, process controls, inspection methods, capacity, and subcontracted operations against the actual requirement. A different process may produce acceptable parts, but the buyer must evaluate its effects on critical characteristics and consistency. Confirm relevant quality-system evidence for the proposed site and scope.

Use explicit sample and production-trial gates.

Agree first-article quantities, measurement reports, functional checks, and acceptance criteria before the trial. Record discrepancies and approval decisions. Where appropriate, evaluate several production conditions or lots to understand repeatability; the scope should follow product risk rather than an arbitrary sample count.

• Approve documentation and capability evidence before sample release.
• Accept samples and resolve deviations before the production trial.
• Review trial quality, delivery, packaging, and corrective actions before allocating recurring volume.

Plan allocation and continuing change control.

Define initial order allocation, ramp conditions, safety stock if appropriate, and responsibility for communicating changes to both sources. Monitor results against agreed criteria and retain traceability by supplier. Do not remove a functioning source before the alternative has demonstrated the approved scope.

• Record buyer approval, remaining risks, and rollback or containment arrangements.
• Identify changes that trigger renewed qualification.
• Keep supplier allocation decisions separate from product revision approval.