Free 21-item 8D checklist (PDF): https://8d-gate.vercel.app/free-8d-checklist?utm_source=devto&utm_medium=article&utm_campaign=aerospace-medical-capa_checklist (enter your email to download)
Many suppliers learn problem solving in automotive, where the 8D is the default format and the customer's portal often dictates the template. Then the company wins an aerospace or medical customer, and the same team discovers that "corrective action" means roughly the same thing but is judged differently.
This post is a practitioner's comparison, kept deliberately general. Standards and customer requirements change, and each customer adds its own layer, so treat this as orientation and always check the current standard text and your customer's supplier manual. I am not quoting clause numbers here on purpose.
What stays the same
The core logic does not change across industries:
- Contain the problem and protect the customer.
- Find the real cause, including why it escaped.
- Act on the cause, not the symptom.
- Verify the action worked.
- Prevent recurrence elsewhere and update the system.
If your automotive 8Ds are already strong on root cause and effectiveness, most of that carries over. The differences are mostly in emphasis, documentation and who else is watching.
Aerospace (AS9100 environment): what tends to feel different
Format is often less prescribed, expectations are not lower. Some aerospace customers accept 8D, some have their own corrective action forms, and many reference industry problem-solving guidance. Do not assume your automotive template will be accepted as-is; ask.
Human factors get serious attention. "Operator error" is weak in automotive and arguably weaker in aerospace, where there is a strong culture of analysing human factors - fatigue, environment, procedures, communication - as systemic contributors rather than individual blame. Expect a reviewer to ask what about the system allowed the error.
Traceability and configuration matter more. Containment questions tend to go further: which serial numbers, which lots, which configuration or revision, what is already installed or in service. Your D3 may need to cover product that has left your plant long ago.
Escapes may have airworthiness implications. Depending on the nonconformance, there may be customer or authority notification expectations that go beyond the corrective action report. Those processes are separate and time-sensitive; your quality lead and the customer's requirements decide them, not the 8D template.
Special processes and sub-tier suppliers. Many aerospace issues trace back to special processes or sub-tier suppliers. Expect to be asked how you flow requirements down and how you verify the sub-tier's corrective action, not just your own.
Medical devices (ISO 13485 environment): what tends to feel different
CAPA is a system, not a report. In medical, corrective and preventive action is usually run as a formal CAPA process inside the QMS, with its own procedure, records, and management review links. An 8D can be the investigation method inside a CAPA, but the CAPA record is what auditors typically follow.
Risk drives the depth. Medical quality systems tie decisions to risk to the patient and user. Expect questions like: what is the risk of this nonconformance, does the risk assessment need updating, and is the depth of the investigation proportionate to that risk? A low-risk cosmetic issue and a potential safety issue are not handled the same way.
Verification and validation of the action itself. Changing a process in a medical environment may trigger validation activity, and the action has to be shown not to introduce new problems. "We changed the parameter" is incomplete without evidence that the changed process is still validated.
Complaints, feedback and regulatory reporting are connected. Customer complaints feed into CAPA, and some complaints may have regulatory reporting implications for the device manufacturer. As a supplier you usually do not own that decision, but your report's speed and clarity can matter to it.
Documentation is the product of the work. Auditors in medical often look for a closed loop in the records: input, investigation, action, verification of effectiveness, closure approval. Gaps in the paperwork tend to be treated as gaps in the process.
A quick comparison
| Topic | Typical automotive 8D | Aerospace emphasis | Medical emphasis |
|---|---|---|---|
| Format | Customer template / portal | Varies by customer | CAPA process in QMS |
| Containment scope | Plant, warehouse, transit | Plus serials, configuration, in-service | Plus distributed product, risk-based |
| Root cause | Occurrence + escape | Plus human factors, sub-tier | Plus proportionality to risk |
| Actions | PFMEA / control plan update | Plus flow-down to sub-tiers | Plus validation impact |
| Closure | Effectiveness data | Effectiveness + customer acceptance | Effectiveness + formal CAPA closure |
This is a generalisation. Individual customers in all three industries will differ.
Practical advice for a supplier serving several industries
- Keep one solid method, adapt the wrapper. Strong root cause and effectiveness logic works everywhere; the form and the extra sections change.
- Build a short per-customer checklist of what their supplier manual adds - notification timing, required forms, sub-tier expectations.
- Write for the strictest reader. If one report could end up in front of an aerospace or medical auditor, document traceability, risk thinking and verification even if your automotive customer would not ask.
- Do not let the template do the thinking. A fully filled form with an unverified cause is still an unverified cause, in any industry.
A checklist for the core logic
Whatever the industry, the same core questions decide whether a corrective action holds up: is the cause verified, does each action link to a cause, is containment complete, is effectiveness shown. The free 8D Gate checklist covers these in 21 items you can run through before you send a report. It does not cover AS9100, ISO 13485 or any customer-specific requirement.
Get the 21-item PDF checklist: https://8d-gate.vercel.app/free-8d-checklist?utm_source=devto&utm_medium=article&utm_campaign=aerospace-medical-capa_checklist (enter your email to download)
Free templates and tools (5 Whys, fishbone, Is/Is-not, CAPA form): https://8d-gate.vercel.app/free-8d-quality-tools?utm_source=devto&utm_medium=article&utm_campaign=aerospace-medical-capa
If you'd rather have all of those templates in one download (Word, PDF and Excel), there is a paid 8D Template Pack for about €9: https://8d-gate.vercel.app/8d-template-pack?utm_source=devto&utm_campaign=aerospace-medical-capa (each template is also free on its own page).
Advisory only. The checklist is a self-check before you send. It does not replace your customer's SQE, your own quality sign-off, or any IATF, AS9100, ISO 13485 or customer requirement.
Question for practitioners who moved between industries: what surprised you most the first time an aerospace or medical customer reviewed your corrective action?
