Supplier Corrective Action Request (SCAR) Management Guide

A practical, 8D-aligned guide to issuing, tracking, verifying, and closing Supplier Corrective Action Requests (SCARs) with defensible evidence. Written for quality managers who own supplier performance under ISO 9001 clause 8.4 and AS9100/API Q1 flow-down requirements.

What a SCAR is — and when to issue one

A SCAR is a formal request to a supplier to investigate a nonconformance, identify root cause, implement corrective action, and prove effectiveness. Issue a SCAR when a supplier ships nonconforming product, misses a documented requirement, or triggers a repeat finding in receiving inspection or field use. Casual emails do not satisfy ISO 9001 clause 8.4.2 evidence expectations — a controlled SCAR record does.

The 8D workflow QMS2GO enforces

• D1 — Team: named cross-functional responders on both sides.
• D2 — Problem description: quantified, with part, lot, and receipt evidence.
• D3 — Interim containment: sort, segregate, and quarantine impacted stock.
• D4 — Root cause: 5-Why or fishbone, tied to a specific process failure mode.
• D5 — Corrective action: permanent fix with owner and due date.
• D6 — Implementation: verification the fix is in production.
• D7 — Prevention: procedure updates, control plan changes, training.
• D8 — Team recognition and closure with QA approval.

Evidence, portal access, and audit trail

Suppliers respond through a secure portal — no email chains, no lost attachments. Every submission is versioned, timestamped, and linked to the originating nonconformance and receiving inspection record. When an auditor asks "show me how you manage supplier corrective action," you open one record and the full 8D thread, evidence files, and approvals are there.

Related resources

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