Prepare for Your Internal Audit Before the Auditor Arrives
A practical AS9100 internal audit preparation checklist for aerospace machine shops, build-to-print manufacturers, suppliers, and quality teams that want more than a completed checklist — they want a quality system that actually works.
An internal audit should not be a paperwork exercise. For aerospace suppliers, a well-planned internal audit is one of the most useful tools for finding process risk before a customer, registrar, or prime contractor finds it.
At Apogee Quality Management Systems, we help aerospace suppliers prepare for AS9100, AS9120, and ISO 9001 internal audits by focusing on what matters most: objective evidence, process effectiveness, customer requirements, supplier controls, corrective action, and leadership visibility.
The goal is not just to “pass the audit.” The goal is to build and maintain a quality management system that helps the company operate better every day.
Why Internal Audit Preparation Matters
Many companies wait until the internal audit is scheduled before asking whether the system is ready. By then, process owners may be scrambling to find records, close overdue actions, update procedures, or explain how their process works.
A better approach is to prepare before the audit by checking whether the system is implemented, understood, and supported by objective evidence.
A useful internal audit preparation process helps your company:
- Confirm that customer requirements are understood and flowed down.
- Verify that drawings, models, specifications, and revisions are controlled.
- Identify missing or incomplete records before the audit.
- Check that suppliers and outsourced processes are being monitored.
- Confirm that measuring equipment and calibration records are current.
- Review nonconformances and corrective actions for effectiveness.
- Ensure employees understand the processes they are responsible for.
- Prepare leadership for management review and audit results.
- Reduce the risk of repeat findings.
- Strengthen the business, not just the audit file.
Internal Audit Preparation Checklist
1. Confirm Audit Scope and Criteria
Use this checklist before your next internal audit, surveillance audit, customer audit, or certification-body audit.
- Defined the audit scope.
- Identified applicable standards, customer requirements, procedures, and internal requirements.
- Confirmed which sites, departments, processes, or product lines are included.
- Confirmed whether the audit applies to ISO 9001, AS9100, AS9120, or another requirement set.
- Identified any excluded or non-applicable requirements.
- Confirmed whether design and development activities are in scope.
- Communicated the audit schedule to process owners.
Common issue:
The audit starts before the organization agrees on scope, criteria, or process ownership.
2. Review Customer Requirements and Contract Review Records
For aerospace suppliers, many quality problems begin during contract review.
Check whether your team can show:
- Purchase order review records.
- Review of customer drawings, models, specifications, and revisions.
- Customer flowdown requirements.
- Special process requirements.
- Inspection and documentation requirements.
- Packaging, labeling, and delivery requirements.
- Customer communication records.
- Evidence that unclear or conflicting requirements were resolved before work began.
Business benefit:
Strong contract review helps prevent wrong-revision work, missed requirements, rework, delivery delays, and customer dissatisfaction.
3. Verify Drawing, Specification, and Revision Control
Build-to-print companies need strong control of customer-provided technical information.
Check whether you can demonstrate:
- Current customer drawings and specifications are available at point of use.
- Obsolete drawings or revisions are controlled or removed.
- Models, digital files, and technical data are controlled.
- Changes are reviewed and communicated.
- Travelers, routers, work orders, and inspection plans match the correct revision.
- Personnel understand how to verify they are using current requirements.
Common issue:
Production or inspection records reference a different revision than the customer order or drawing package.
4. Review Manufacturing Planning and Production Controls
Internal audits should confirm that production planning supports conformity.
Check whether records show:
- Work orders, travelers, or routers are complete.
- Operations are sequenced appropriately.
- CNC programs, setup instructions, or job notes are controlled.
- First-piece, in-process, or final inspection points are defined.
- Required equipment, tooling, and fixtures are identified.
- Production changes are controlled.
- Operators understand acceptance criteria.
- Production records are retained and legible.
Business benefit:
Good planning reduces variation, scrap, rework, and customer escapes.
5. Check Inspection and Acceptance Evidence
Aerospace customers expect more than verbal confirmation that parts were inspected.
Check whether you have:
- Receiving inspection records.
- In-process inspection records.
- Final inspection records.
- First article or first-piece records, where applicable.
- Evidence of acceptance criteria.
- Evidence that nonconforming product was identified and controlled.
- Certificates of Conformance, where required.
- Inspection records tied to the correct job, drawing, revision, and customer requirement.
Common issue:
Inspection happened, but the records do not clearly prove what was inspected, against what requirement, by whom, and with what result.
6. Verify Calibration and Measuring Equipment Control
Measurement confidence is critical in aerospace manufacturing.
Check whether you can show:
- Current calibration records.
- Calibration status identification.
- Equipment recall system.
- Out-of-tolerance evaluation records, if applicable.
- Protection and handling of measuring equipment.
- Evidence that employees are using appropriate measuring tools.
- Records showing equipment is suitable for the measurement being performed.
Business benefit:
Calibration control protects product acceptance decisions and customer confidence.
7. Review Supplier Approval and Monitoring
Aerospace suppliers are responsible for controlling externally provided products, services, and processes.
Check whether you have:
- Approved supplier list.
- Supplier approval criteria.
- Supplier performance monitoring.
- Purchasing flowdown requirements.
- Records for outsourced special processes, if applicable.
- Supplier corrective action records.
- Evidence of supplier risk review.
- Receiving verification records.
Common issue:
Suppliers are used because “we have always used them,” but approval, monitoring, and flowdown evidence is weak or missing.
8. Review Nonconforming Output and CAPA Records
Nonconformances are not just audit records. They are opportunities to prevent recurrence.
Check whether records show:
- Nonconforming product was identified and controlled.
- Disposition decisions were authorized.
- Customer notification occurred when required.
- Root cause was evaluated.
- Corrective action addressed the cause, not just the symptom.
- Verification of effectiveness was completed.
- Repeat issues were analyzed.
- CAPA records are closed with objective evidence.
Business benefit:
Strong CAPA reduces repeat problems, customer complaints, and audit findings.
9. Confirm Training, Competence, and Awareness
Employees should understand the processes they perform and the quality requirements that apply.
Check whether you have:
- Training records.
- Competence requirements by role.
- Evidence of qualification for special tasks.
- Awareness of quality policy and objectives.
- Awareness of product conformity requirements.
- Awareness of the impact of nonconforming work.
- Records showing employees are trained on updated procedures.
Common issue:
Employees are competent in practice, but the organization cannot produce objective evidence of training or qualification.
10. Prepare Management Review Inputs
Management review should be useful to leadership, not just performed for the auditor.
Check whether leadership has current information on:
- Quality objectives.
- Process performance.
- Customer satisfaction.
- On-time delivery.
- Supplier performance.
- Nonconformities and corrective actions.
- Internal audit results.
- External audit results.
- Risks and opportunities.
- Resource needs.
- Improvement actions.
Business benefit:
A good management review helps leadership see whether the QMS is helping or hurting the business.
What Apogee Looks for During Internal Audit Readiness
Apogee evaluates more than whether a procedure exists. We look for whether the process is understood, implemented, effective, and supported by objective evidence. Our internal audit preparation support can include:
- Audit scope review.
- Process owner readiness review.
- Evidence request list.
- AS9100 or AS9120 readiness checklist.
- Internal audit schedule review.
- Process-based checklist development.
- Internal audit planning.
- Pre-audit document and record review.
- Corrective action readiness review.
- Management review preparation.
- Final readiness debrief.
Who This Checklist Is For
This checklist is designed for:
- Aerospace machine shops.
- Build-to-print manufacturers.
- Precision machining companies.
- Aerospace distributors.
- ISO 9001 companies entering aerospace.
- AS9100-certified suppliers preparing for surveillance or recertification.
- Companies pursuing AS9100 certification for the first time.
- Quality managers who need a practical pre-audit readiness tool.
- Owners and general managers who want better visibility before an audit.
Why Work With Apogee QMS
Apogee QMS provides aerospace quality assurance support for ISO 9001, AS9100, AS9120, and related aerospace supplier requirements.
Apogee is led by Kevin Walters, AEA, PMP, PMI-RMP, an aerospace quality professional with over 30 years of experience in quality assurance, project management, satellite operations, procedure development, training, internal and supplier audits, corrective action, and AS9100/AS9120/ISO 9001 consulting.
Apogee helps aerospace suppliers build systems that are:
- Audit-ready.
- Practical.
- Evidence-based.
- Usable by the business.
- Focused on customer and supplier requirements.
- Built to support the company after the audit is over.
Need Help Preparing for an Internal Audit?
Apogee can help your team prepare before the audit begins. Whether you need a readiness review, internal audit support, CAPA review, management review preparation, or a complete AS9100 internal audit program, Apogee provides practical aerospace QMS support.
FAQ's
An internal audit preparation checklist helps an organization confirm that its processes, records, procedures, and objective evidence are ready before an internal, customer, or certification-body audit.
No. The checklist is useful for ISO 9001, AS9100, AS9120, and aerospace suppliers preparing for customer or internal audits.
Yes. Apogee can support internal audit planning, checklist development, audit execution, reporting, and corrective action follow-up.
Yes. Apogee provides CAPA and audit finding response support, including root cause, corrective action planning, evidence review, and verification support.
No. Apogee provides consulting, internal audit, implementation, and readiness support. Certification decisions are made only by an accredited certification body.