Functional Safety Audit
Activity
Topic overview
Quick facts
- Functional Safety Audit, defined
- Understanding Functional Safety Audit
- Why Functional Safety Audit matters to your program
- Working with Functional Safety Audit
- Common Functional Safety Audit mistakes
- Standards related to Functional Safety Audit
- Functional Safety Audit by industry
- Ask our team about Functional Safety Audit
- Functional Safety Audit: related terms
The audit and the assessment divide the assurance question in two. The functional safety audit asks: did the organization do what its safety plan and the standard's process requirements say it would do, with the required roles, independence, reviews, and records? The functional safety assessment asks the harder question of whether the result is actually safe.
makes the split explicit among its confirmation measures, defining the functional safety audit as an examination of the implemented processes, and embeds the same expectation in its management of functional safety requirements. A program can pass its audit and fail its assessment, and occasionally the reverse.
Auditors work by sampling against the safety plan, which is the audit baseline.
Typical samples: pick a work product and check it went through the planned review with reviewers of the required competence and independence, and that findings were closed; pick a change and walk it through impact analysis and re-verification; pick a named role and check the competence records behind it; pick a document and verify configuration management can produce its exact reviewed version; pick a deviation from the plan and check it was dispositioned rather than silently accumulated.
The audit's product is a findings report feeding corrective action.
Because process failures are leading indicators of product failures, audits are scheduled through the lifecycle rather than at the end, and their findings are cheap: a broken review practice found at the first audit costs a procedure fix, while the same practice discovered by the final assessment casts doubt on every review record in the evidence set.
Why Functional Safety Audit matters to your program
For leadership the audit is the early warning system on certification risk: it is much cheaper to learn mid-program that your reviews are rubber stamps or your configuration management cannot reproduce a baseline than to learn it from the final assessment, where such findings contaminate the credibility of the entire evidence set.
Customer safety teams and certification bodies also audit suppliers directly, so audit readiness is part of being sellable into safety markets, and chronic audit findings are read by acquirers and enterprise customers as organizational immaturity.
Working with Functional Safety Audit
Audit cycle
Audits are planned in the functional safety plan at defined milestones, performed by someone independent of the work audited, an internal quality or safety function for interim audits, the assessor or certification body for formal ones.
The auditor samples records against the plan, raises findings graded by severity, and the program tracks corrective actions to closure, with recurring findings escalated as systemic issues.
What distinguishes a useful audit from theater: the samples are chosen by the auditor rather than curated by the project, the findings name root causes rather than symptoms, and closure is verified by re-sampling rather than by accepting a promise.
Common Functional Safety Audit mistakes
Standards related to Functional Safety Audit
Functional Safety Audit is defined and governed by ISO 26262 - automotive functional safety standard defining asil levels and the automotive safety lifecycle.
IEC 61508 sets the requirements that Functional Safety Audit work has to satisfy: the umbrella functional safety standard defining the safety lifecycle, sil levels, and requirements for electrical, electronic, and programmable systems.
Audit vs assessment vs verification
| Activity | Question | Object |
|---|---|---|
| FS audit | Is the process being followed? | Process execution |
| FSA / assessment | Is functional safety achieved? | Product + evidence |
| Verification | Does the output meet its spec? | Work products |
| QMS audit | Does the org follow its QMS? | Organization |
Functional Safety Audit by industry
Functional Safety Audit shapes how autonomous systems teams argue safety - autonomous mobile equipment, off-highway autonomy, and driverless platforms.
Functional Safety Audit shapes how industrial machinery teams argue safety - fixed and mobile machinery, packaging lines, and manufacturing equipment.
Ask our team about Functional Safety Audit
Ben TwomblyFounder & CEOLeads CSA's functional-safety, certification, and engineering programs for safety-critical products and organizations. His assessor-side background informs practical programs that connect standards, engineering work, and credible evidence.
Tom CyrPrincipal Safety Engineer, IFSPSupports industrial and rail functional-safety programs with safety analysis, requirements, lifecycle planning, and certification-readiness guidance.Functional Safety Audit: related terms
How each connects to Functional Safety Audit:
Functional Safety Assessment appears in the same lifecycle work as Functional Safety Audit and is usually produced or reviewed alongside it.
Programs that deal with Functional Safety Audit almost always involve Functional Safety Plan in the same phase.
Programs that deal with Functional Safety Audit almost always involve Safety Management System in the same phase.
Functional Safety is governed by IEC 61508 as well, which is why the two show up together in audits.
Both Functional Safety Audit and SIL sit under IEC 61508, so evidence for one usually references the other.
ISO 26262 connects the two: Functional Safety Audit and ASIL are assessed against the same lifecycle.
Both Functional Safety Audit and HARA sit under ISO 26262, so evidence for one usually references the other.
Both Functional Safety Audit and Safety Function sit under IEC 61508, so evidence for one usually references the other.
Safe Torque Off is governed by IEC 61508 as well, which is why the two show up together in audits.
IEC 61508 connects the two: Functional Safety Audit and PFH are assessed against the same lifecycle.
FMEA is governed by ISO 26262 as well, which is why the two show up together in audits.
Both Functional Safety Audit and FMEDA sit under ISO 26262, so evidence for one usually references the other.