Expired Calibration Certificate in an Audit: What Happens and How to Prevent It
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The Most Common Audit Finding — Are You at Risk?
Discovering an expired calibration certificate during an audit is one of the most avoidable failures for Thai factories and labs — yet it remains one of the most common. It happens most often in organizations managing calibration schedules with spreadsheets and no automated expiry alerts.
Consequences When an Expired Certificate Is Found in an Audit
| Standard | Finding Level | Consequences |
|---|---|---|
| ISO 9001 | Major Non-conformity | Corrective evidence required within 90 days; possible certification suspension |
| IATF 16949 | Major Non-conformity | Corrective Action Plan within 60 days; Tier-1 customers may suspend purchase orders |
| BRC / FSSC 22000 | Major Non-conformity | Certificate suspension; product produced during the lapse period may need review |
What to Do About Product Made with Uncalibrated Instruments
- Identify which measurements the instrument was used for
- Identify which products were inspected with the instrument during the lapse period
- Determine whether product has been shipped
- Check the new calibration result — if the instrument was still within tolerance, the risk to product quality is minimal and can be documented as negligible impact
If the instrument was out-of-tolerance during the lapse period, a more thorough impact assessment — potentially including product recall — is required.
Why Certificates Expire Without Anyone Knowing
- Excel-based tracking with no automated alerts
- Hundreds of instruments — impossible to manually track every one
- Unclear ownership — no designated person responsible per instrument
- Instruments moved or loaned out, leaving the tracking system
How to Prevent Expired Certificates
- Use calibration management software with automated alerts at 30/60/90 days before expiry
- Assign a named owner to every instrument
- Run a quarterly internal calibration status audit — don't wait for the ISO auditor
- Choose labs that proactively notify you before your certificates expire
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