Supplier Corrective Action Process
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Supplier Corrective Action Process Under GJB9001C
The supplier corrective action process is a critical component of GJB9001C compliance for PCB manufacturers. Clause 8.5.2 requires organizations to take corrective action to eliminate the cause of nonconformities and prevent recurrence. When nonconformities originate from external providers — including PCB fabrication houses, laminate suppliers, component distributors, and assembly subcontractors — organizations must initiate a supplier corrective action process to ensure that root causes are identified, corrective actions are implemented, and recurrence is prevented.
For PCB manufacturers, the Supplier Corrective Action Request (SCAR) is the primary tool for addressing supplier quality issues. A structured SCAR process ensures that nonconformances are systematically documented, investigated, resolved, and verified. This guide provides a complete implementation roadmap covering the standard requirements, the SCAR framework, the 8D methodology for root cause analysis, the corrective action process, PCB-specific scenarios, and audit preparation.
Engineering Summary
- GJB9001C Clause 8.5.2 requires organizations to take corrective action to eliminate the cause of nonconformities and prevent recurrence.
- Supplier Corrective Action Requests (SCARs) are the formal mechanism for addressing supplier quality issues.
- The corrective action process includes: problem identification, containment, root cause analysis (8D methodology), corrective action planning, implementation, verification, and closure.
- Root cause analysis must systematically identify and address underlying causes — not just symptoms.
- Corrective actions must be verified for effectiveness before closure.
- For PCB manufacturers, SCARs cover issues such as material defects, workmanship nonconformances, delivery failures, and documentation errors.
- Organizations shall retain documented information as evidence of the nature of nonconformities, subsequent actions taken, and the results of any corrective actions.、
1. What Auditors Check — A Quick Overview
| Audit Focus | What External Auditors Verify | Expected Evidence |
|---|---|---|
| SCAR Process | Is a documented SCAR process established and implemented? | SCAR procedure, documented process |
| Nonconformance Recording | Are supplier nonconformances documented and tracked? | Nonconformance records, SCAR logs, supplier quality records |
| Root Cause Analysis | Is root cause analysis conducted for supplier nonconformances? | Root cause analysis records, 8D reports, cause-and-effect diagrams |
| Corrective Action | Are corrective actions implemented to prevent recurrence? | Corrective action plans, implementation records, closure reports |
| Verification | Is corrective action effectiveness verified? | Verification records, follow-up inspection results, trend analysis |
| Documented Information | Are records of nonconformities, actions, and results retained? | Documented information records, SCAR files, corrective action logs |
| Preventive Action Integration | Are lessons learned from SCARs used to improve other processes? | Corrective action trend analysis, management review inputs, process improvement records |
KEY INSIGHT:
Supplier corrective action is one of the most frequently audited areas in GJB9001C. Auditors will verify that nonconformances are documented, root causes are identified, corrective actions are implemented and verified, and records are retained as documented information.
2. Standard Requirements for Supplier Corrective Action
2.1 GJB9001C Clause 8.5.2 — Corrective Action
GJB9001C-2017 Clause 8.5.2 establishes the foundational requirement for corrective action:
"When a nonconformity occurs, including any arising from complaints, the organization shall: a) react to the nonconformity and, as applicable, take action to control and correct it; b) evaluate the need for action to eliminate the cause(s) of the nonconformity, in order that it does not recur or occur elsewhere, by: reviewing and analyzing the nonconformity; determining the causes of the nonconformity; determining if similar nonconformities exist, or could potentially occur; c) implement any action needed; d) review the effectiveness of any corrective action taken; e) update risks and opportunities determined during planning, if necessary; f) make changes to the quality management system, if necessary."
For supplier corrective action, this means:
- Reacting to supplier nonconformities and taking action to control and correct them
- Evaluating the need for action to eliminate the cause(s) of the nonconformity
- Implementing any action needed
- Reviewing the effectiveness of any corrective action taken
- Retaining documented information as evidence of the nature of the nonconformities, any subsequent actions taken, and the results of any corrective action
2.2 Clause 8.5.3 — Preventive Action
Clause 8.5.3 requires organizations to determine and implement actions to prevent potential nonconformities from occurring or recurring:
- Organizations shall determine and implement actions to prevent potential nonconformities from occurring or recurring, including product and process nonconformities
- Organizations shall identify and eliminate the causes of potential nonconformities
- Preventive actions taken shall be appropriate to the potential effects of the potential nonconformities
- Organizations shall retain documented information as evidence of the nature of potential nonconformities, actions taken, and results of preventive actions
2.3 Clause 8.4 — External Provider Control
Clause 8.4.1 requires organizations to "establish and implement criteria for the evaluation, selection, performance monitoring, and re-evaluation of external providers." For corrective action, this means:
- Requiring external providers to report technical quality issues and resolution results
- Requiring external providers to notify the organization of technical state changes, production line or process changes, or equipment changes
- Communicating with suppliers identified for improvement and conducting follow-up management to control and reduce risks
- Removing non-conforming suppliers from the Approved Supplier List
2.4 Clause 8.7 — Control of Nonconforming Outputs
Clause 8.7 requires organizations to control nonconforming outputs to prevent unintended use. For supplier corrective action:
- Nonconforming outputs from suppliers must be identified and controlled
- Correction may be required (rework, rework, repair, etc.)
- Disposition actions must be documented and retained
- Counterfeit or suspect counterfeit parts must be quarantined, controlled, and dispositioned
2.5 Corrective Action vs. Preventive Action
Understanding the distinction between corrective and preventive action is essential for GJB9001C compliance:
| Aspect | Corrective Action (CA) | Preventive Action (PA) |
|---|---|---|
| Trigger | Occurrence of a nonconformity | Potential nonconformity risk identified |
| Purpose | Eliminate the cause of a nonconformity to prevent recurrence | Eliminate the cause of a potential nonconformity to prevent occurrence |
| Timing | Reactive — after nonconformity is identified | Proactive — before nonconformity occurs |
| PCB Example | Supplier delivers boards with impedance out of spec — root cause analysis and corrective action implemented | Supplier's process capability shows potential for impedance variation — preventive action implemented to stabilize process |
3. SCAR — Supplier Corrective Action Request Framework
3.1 What is a SCAR?
A Supplier Corrective Action Request (SCAR) is a formal document used to communicate a nonconformance to a supplier and request corrective action. The SCAR process ensures that supplier nonconformances are systematically documented, investigated, resolved, and verified.
SCAR types include:
- Internal SCAR: Initiated by the organization's quality or procurement department based on incoming inspection, production, or customer feedback
- External SCAR: Initiated by customers regarding supplier quality issues that affect their products
- Supplier-Initiated SCAR: Initiated by the supplier to address quality issues identified in their own processes
3.2 SCAR Categories
SCARs can be categorized by severity:
- Category 1 — Critical: Issues affecting safety, reliability, or compliance. Requires immediate action.
- Category 2 — Major: Issues affecting form, fit, function, or performance. Requires formal corrective action.
- Category 3 — Minor: Issues affecting aesthetics or non-critical characteristics. Requires correction but may not require formal root cause analysis.
3.3 SCAR Content
A complete SCAR should include:
- SCAR Number: Unique identifier for tracking
- Supplier Information: Supplier name, address, contact person
- Nonconformance Description: Detailed description of the issue
- Product Information: Part number, batch/lot number, quantity affected
- Problem Classification: Category and severity
- Immediate Action (Containment): Actions taken to prevent further impact
- Root Cause Analysis: Identification of root cause(s)
- Corrective Action Plan: Actions to prevent recurrence
- Implementation Date: Planned completion date
- Verification: Evidence of corrective action effectiveness
- Closure: Approval and sign-off
4. Root Cause Analysis Methodologies — Finding the Real Cause
Root cause analysis is the most critical step in the supplier corrective action process. Without identifying the true root cause, corrective actions may address symptoms rather than underlying issues.
4.1 The 5 Whys Technique
The 5 Whys is a simple but powerful technique for identifying root causes by repeatedly asking "why" until the fundamental cause is revealed.
- PCB Example: Impedance out of specification
- Why 1: Why was impedance out of spec? → Because trace width was incorrect
- Why 2: Why was trace width incorrect? → Because the etching process was not controlled
- Why 3: Why was the etching process not controlled? → Because etching parameters were not monitored
- Why 4: Why were etching parameters not monitored? → Because SPC was not implemented
- Why 5: Why was SPC not implemented? → Because the process control plan was incomplete
- Root Cause: Incomplete process control plan
4.2 Cause-and-Effect Diagram (Ishikawa/Fishbone)
The fishbone diagram organizes potential causes into categories to systematically identify root causes.
| Category | PCB Supplier Example |
|---|---|
| Materials | Incorrect laminate Dk, inconsistent copper thickness, contaminated materials |
| Methods | Incorrect etching parameters, improper soldering profile, incomplete work instructions |
| Machines | Uncalibrated equipment, worn tooling, insufficient maintenance |
| People | Insufficient training, operator error, lack of awareness |
| Measurement | Incorrect inspection methods, faulty test equipment, measurement error |
| Environment | Temperature/humidity variation, contamination, inadequate lighting |
4.3 Pareto Analysis
Pareto analysis identifies the most significant causes or issues by applying the 80/20 rule — 80% of effects come from 20% of causes.
- PCB Supplier Example: Supplier quality issues by type
- 80% of nonconformances are caused by three issues: (1) impedance variation, (2) soldering defects, (3) dimensional nonconformances
- Corrective actions focus on these top three issues for maximum impact
4.4 8D (Eight Disciplines) Methodology
The 8D methodology is a structured problem-solving approach widely used in defense and aerospace industries for supplier corrective action.
| Discipline | Description |
|---|---|
| D1: Establish the Team | Form a team with the necessary knowledge, skills, and authority |
| D2: Describe the Problem | Clearly define the problem in measurable terms |
| D3: Implement Interim Containment | Isolate the problem from customers and downstream processes |
| D4: Identify Root Cause | Conduct root cause analysis (5 Whys, fishbone, etc.) |
| D5: Develop Permanent Corrective Action | Develop and validate corrective actions |
| D6: Implement and Verify Corrective Action | Implement corrective action and verify effectiveness |
| D7: Prevent Recurrence | Update processes, procedures, and training to prevent recurrence |
| D8: Congratulate the Team | Recognize team contributions and close the SCAR |
5. Supplier Corrective Action Process — The Nine Steps
The supplier corrective action process follows a structured approach from problem identification through closure and follow-up.
| Step | Activity | PCB Supplier Example |
|---|---|---|
| 1 | Identify Nonconformance — Identify a supplier nonconformance through incoming inspection, production, or customer feedback. | Incoming inspection detects impedance values out of specification on a batch of PCBs from a fabrication supplier. |
| 2 | Contain the Problem — Immediate action to prevent further impact. Quarantine affected materials, notify production, and assess impact on customers. | Quarantine the affected PCB batch; notify production to stop using the material; assess impact on finished products. |
| 3 | Issue SCAR — Issue a formal Supplier Corrective Action Request to the supplier. Define the problem, severity, and required response timeline. | Issue SCAR to PCB fabrication supplier; define problem, severity (Major), and request root cause analysis and corrective action within 14 days. |
| 4 | Conduct Root Cause Analysis — The supplier conducts root cause analysis using 5 Whys, fishbone, or 8D methodology. | Supplier conducts 5 Whys analysis: determines root cause is incomplete calibration of impedance test equipment. |
| 5 | Develop Corrective Action Plan — Develop and document a corrective action plan to address root cause and prevent recurrence. | Supplier develops corrective action: implement daily calibration of impedance test equipment; update calibration procedure; retrain operators. |
| 6 | Review and Approve Plan — Review the corrective action plan and approve or request modifications. | Review supplier's corrective action plan; approve with request for evidence of operator training. |
| 7 | Implement Corrective Action — Supplier implements the corrective action plan and provides evidence of implementation. | Supplier implements daily calibration; provides calibration records and training documentation. |
| 8 | Verify Effectiveness — Verify that the corrective action is effective. Conduct follow-up inspection or testing on subsequent deliveries. | Verify corrective action effectiveness on next delivery; inspect impedance values; confirm all are within specification. |
| 9 | Close SCAR — Close the SCAR when corrective action is verified effective. Update supplier performance records. | Close SCAR; update supplier performance record; document lessons learned; retain documented information. |
CRITICAL RULE:
Corrective actions must be verified for effectiveness before closure. Organizations shall retain documented information as evidence of the nature of nonconformities, subsequent actions taken, and the results of any corrective action.
6. PCB Supplier Corrective Action Scenarios — Practical Examples
6.1 Material Defect — Laminate Dk Variation
| Item | Description |
|---|---|
| Problem | Laminate Dk variation causing impedance nonconformance in PCB production |
| Root Cause (5 Whys) | Why? → Inconsistent Dk from supplier. Why? → Supplier's resin content variation. Why? → Incomplete resin mixing process control. Why? → Process control parameters not monitored. Why? → Quality control plan missing resin content verification |
| Corrective Action | Supplier: implement resin content monitoring; add Dk verification at incoming inspection; update quality control plan |
| Verification | Subsequent three batches of laminate verified — Dk within specification; impedance testing passed |
| SCAR Closure | SCAR closed after verification; supplier performance record updated |
6.2 Workmanship Nonconformance — Solder Joint Defect
| Item | Description |
|---|---|
| Problem | Solder joint defects (voids, insufficient wetting) on PCBA from assembly supplier |
| Root Cause (Fishbone) | Methods: soldering profile incorrect; People: operator not trained on new solder paste; Materials: solder paste expired |
| Corrective Action | Update soldering profile; retrain operators; implement solder paste expiration monitoring; conduct process capability study |
| Verification | Next two production batches inspected — zero solder joint defects; X-ray inspection confirmed |
| SCAR Closure | SCAR closed after verification; supplier process updated; training records retained |
6.3 Corrective Action Priority Matrix
Corrective actions should be prioritized based on risk and impact:
| Priority | Impact | Response Time | PCB Example |
|---|---|---|---|
| Critical | Safety, reliability, or compliance issue | 24-48 hours | Counterfeit components detected; immediate quarantine and GIDEP reporting |
| High | Form, fit, function, or performance issue | 5-10 business days | Impedance out of spec causing functional test failure |
| Medium | Non-critical quality issue | 10-20 business days | Cosmetic defects, minor dimensional deviations |
| Low | Minor issue with minimal impact | 20-30 business days | Documentation errors, minor labeling issues |
7. Key Control Points in PCB Supplier Corrective Action
7.1 SCAR Initiation and Tracking
- Establish a documented SCAR procedure defining initiation, investigation, resolution, and closure
- Use a unique SCAR numbering system for tracking
- Maintain a SCAR log with status tracking (open, investigation, corrective action, verification, closed)
- Assign clear ownership and deadlines for each SCAR
- Escalate overdue SCARs to management
7.2 Root Cause Analysis
- Require suppliers to conduct thorough root cause analysis using structured methodologies (5 Whys, fishbone, 8D)
- Verify that root cause analysis identifies underlying causes — not just symptoms
- Request additional analysis if root cause is not identified or is superficial
- Document root cause analysis findings in the SCAR record
7.3 Corrective Action Verification
- Verify corrective action effectiveness before closing SCAR
- Conduct follow-up inspection or testing on subsequent deliveries
- Require evidence of implementation (updated procedures, training records, calibration records)
- Monitor performance for a defined period after closure to ensure recurrence does not occur
7.4 Documented Information
- Retain documented information of all SCAR activities: nonconformity description, root cause analysis, corrective action plan, implementation evidence, verification records, and closure approval
- Maintain SCAR records for the required retention period
- Use SCAR data for supplier performance monitoring and trend analysis
- Review SCAR trends in management reviews
7.5 Supplier Communication
- Communicate SCAR requirements clearly to suppliers
- Provide suppliers with SCAR procedures and expected response formats
- Conduct regular SCAR review meetings with key suppliers
- Provide feedback on SCAR quality and timeliness
8. Audit Preparation Checklist for PCB Manufacturers
| # | Check Item | Clause | Status | Notes |
|---|---|---|---|---|
| SCAR Process | ||||
| 1 | SCAR procedure is documented and implemented | 8.5.2 | ☐ | |
| 2 | SCAR numbering and tracking system is established | 8.5.2 | ☐ | |
| Nonconformance Recording | ||||
| 3 | Supplier nonconformances are documented and tracked | 8.5.2 | ☐ | |
| 4 | Nonconformities are classified by severity (critical, major, minor) | 8.5.2 | ☐ | |
| Root Cause Analysis | ||||
| 5 | Root cause analysis is conducted for supplier nonconformances | 8.5.2 | ☐ | |
| 6 | Root cause analysis records are maintained (5 Whys, fishbone, 8D) | 8.5.2 | ☐ | |
| Corrective Action | ||||
| 7 | Corrective action plans are developed and documented | 8.5.2 | ☐ | |
| 8 | Corrective actions are implemented | 8.5.2 | ☐ | |
| Verification | ||||
| 9 | Corrective action effectiveness is verified | 8.5.2 | ☐ | |
| 10 | Verification records are maintained | 8.5.2 | ☐ | |
| Documented Information | ||||
| 11 | SCAR records are retained as documented information | 8.5.2 | ☐ | |
| 12 | SCAR data is used for supplier performance monitoring and trend analysis | 8.4.1 | ☐ | |
| Preventive Action | ||||
| 13 | Preventive actions are determined and implemented as needed | 8.5.3 | ☐ | |
| 14 | Lessons learned are incorporated into process improvements | 8.5.3 | ☐ | |
9. Common Audit Findings and How to Avoid Them
| Finding | Why It Happens | How to Avoid |
|---|---|---|
| "No SCAR procedure" | Corrective action process not documented | Establish documented SCAR procedure; define roles, responsibilities, and timelines |
| "Nonconformances not documented or tracked" | Issues addressed informally without records | Document all supplier nonconformances in SCAR system; maintain SCAR log |
| "No root cause analysis" | Corrective actions address symptoms, not root causes | Require root cause analysis using structured methodologies (5 Whys, fishbone, 8D) |
| "Corrective actions not verified" | Actions implemented but effectiveness not confirmed | Conduct follow-up inspection or testing to verify effectiveness |
| "No documented information of SCAR activities" | Records not retained | Retain documented information of all SCAR activities; maintain SCAR files |
| "SCAR not closed in a timely manner" | No follow-up or escalation process | Establish SCAR closure deadlines; escalate overdue SCARs to management |
| "Trend analysis not conducted" | SCAR data not used for improvement | Conduct trend analysis on SCAR data; use for supplier performance monitoring |
10. Frequently Asked Questions
What is a SCAR under GJB9001C?
A Supplier Corrective Action Request (SCAR) is a formal document used to communicate a nonconformance to a supplier and request corrective action. It ensures that supplier quality issues are systematically documented, investigated, resolved, and verified.
What does GJB9001C require for corrective action?
Clause 8.5.2 requires organizations to react to nonconformities, evaluate the need for corrective action, implement action to eliminate causes, review effectiveness, and retain documented information as evidence.
What is the difference between corrective and preventive action?
Corrective action is reactive — it eliminates the cause of a nonconformity that has already occurred. Preventive action is proactive — it eliminates the cause of a potential nonconformity before it occurs.
What are the 5 Whys?
The 5 Whys is a root cause analysis technique that involves repeatedly asking "why" until the fundamental cause of a problem is identified. It is simple but effective for finding root causes.
What is the 8D methodology?
The 8D (Eight Disciplines) methodology is a structured problem-solving approach used for supplier corrective action. It includes establishing a team, describing the problem, implementing containment, identifying root cause, developing corrective action, verifying effectiveness, preventing recurrence, and closing the SCAR.
What documented information must be retained for corrective action?
Organizations must retain documented information as evidence of the nature of nonconformities, subsequent actions taken, and the results of any corrective action. This includes SCAR records, root cause analysis, corrective action plans, and verification records.
How should corrective actions be prioritized?
Corrective actions should be prioritized based on risk and impact: Critical (safety, reliability) — 24-48 hours; High (form, fit, function) — 5-10 business days; Medium (non-critical quality) — 10-20 business days; Low (minor issues) — 20-30 business days.
What happens if a supplier fails to implement corrective action?
If a supplier fails to implement corrective action, the organization should escalate to management, conduct follow-up communication, and consider removal from the Approved Supplier List if performance does not improve.
Related Standards & Topics
PCB and PCBA Manufacturing for Military and Aerospace Programs
UltroNiu Electronics Group provides PCB and PCBA manufacturing services with GJB9001C-compliant supplier corrective action and quality management. Contact our engineering team for program-specific supplier corrective action and supply chain quality requirements.
Request Engineering ReviewReferences: GJB9001C-2017 Clauses 8.5.2, 8.5.3, 8.4, 8.4.1, 8.7 (Central Military Commission Equipment Development Department). Supplier Corrective Action Request (SCAR) process sourced from GJB9001C implementation guidance and defense industry practice. Root cause analysis methodologies sourced from quality management best practices (5 Whys, Ishikawa/fishbone, 8D). 8D methodology sourced from industry standard problem-solving approaches. Corrective and preventive action definitions sourced from ISO 9000 and GJB9001C implementation guidance. PCB-specific SCAR practices based on industry best practices for military and aerospace PCB manufacturing. Courtesy of UltroNiu Engineering Knowledge Center.
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