What are examples of non-conformance?

In regulated manufacturing environments, a non-conformance is any departure from an approved requirement: drawings, specifications, procedures, software configuration, regulatory constraints, or contractual terms. It is broader than just a bad part.

1. Product & material non-conformances

• Dimensional out-of-tolerance: Features outside drawing tolerance (e.g., hole diameter, flatness, runout) even if the part could still “work.”
• Material mis-match: Wrong alloy, resin grade, heat treat condition, or temper versus the bill of material or material specification.
• Special process failure: Plating thickness, hardness, surface finish, or bonding strength not meeting the approved process specification or certificate of conformance.
• Contamination or foreign object debris: Particulate, oil, or foreign material found where the specification or cleanliness standard prohibits it.
• Labeling and identification errors: Incorrect part number, revision level, serial number, or expiry date on labels, tags, or nameplates.
• Out-of-spec environmental conditions for product: Parts processed or stored outside required temperature, humidity, or cure conditions when those are specified.

2. Process & procedural non-conformances

• Using an unapproved or obsolete procedure: Work performed using a superseded work instruction or a locally modified copy that is not under document control.
• Skipping required process steps: Missing in-process inspection, verification, torque check, leak test, or pressure test defined in the routing or control plan.
• Operating outside process parameters: Heat treat cycle, curing profile, welding parameters, or CNC program feeds/speeds outside validated or approved limits.
• Unapproved tooling or fixtures: Using unqualified gauges, expired fixtures, or personal tools where controlled tooling is specified.
• Bypassing interlocks or controls: Overriding safety or quality interlocks to run equipment outside the validated or approved mode.
• Unauthorized rework or repair: Rework performed without an approved rework instruction, engineering disposition, or proper traceability.

3. Documentation & record non-conformances

• Incomplete batch or lot records: Missing signatures, dates, measured values, test results, or lot/serial traceability information.
• Illegible or ambiguous records: Handwritten entries that cannot be read or interpreted reliably.
• Backdating or out-of-sequence entries: Records completed after the fact without clear annotation or justification, undermining data integrity expectations.
• Using uncontrolled documents: Shop floor using personal printouts or local spreadsheets not tied to the controlled document system.
• Mismatched records vs. actual build: Record says operation completed or test passed, but physical evidence or system data indicates it did not occur or used different parameters.

4. Supplier & incoming non-conformances

• Vendor material off-spec: Certificates of analysis or conformance that do not match required callouts, missing test results, or incorrect revision of a referenced standard.
• Unapproved source or process: Parts produced by a supplier, sub-tier, or process step not on the approved supplier or special process list.
• Packaging & transport damage: Dents, corrosion, moisture ingress, or broken seals on incoming product where shipping and handling requirements are defined.
• Documentation gaps from suppliers: Missing FAI reports, traceability, special process certs, or software documentation required by purchase order.

5. Software, data, and system non-conformances

• Unvalidated software changes: MES, PLC, CNC programs, or test stand software changed without going through required validation and change control.
• Wrong configuration or master data: Incorrect routings, BOMs, inspection plans, or control limits in ERP/MES that cause work to deviate from the approved design or control plan.
• Bypassing electronic controls: Using “test” or “maintenance” modes in production without authorization and documentation.
• Data integrity issues: Incomplete, overwritten, or untraceable electronic records where regulations or internal policy require reliable audit trails.
• Interface failures between systems: Missing or misaligned data during handoffs (e.g., PLM to MES, MES to QMS) that lead to building to the wrong revision or inspection criteria.

6. Regulatory & contractual non-conformances

• Ignoring regulatory constraints in process: Operating outside environmental, sterility, or cleanliness conditions that are part of a regulated process description.
• Missing required inspections or sign-offs: Not performing inspections or approvals required by customer contract, drawing notes, or regulatory dossier.
• Improper handling of export-controlled data: Manufacturing or documentation practices that do not align with export control classifications and associated handling rules.
• Use of non-qualified equipment: Using equipment that is not installed, qualified, or maintained per your own regulated procedures where such qualification is required.

7. How context affects what “counts” as non-conformance

Which events are formally logged as non-conformances depends on:

• Your specifications and procedures: If a requirement is not written, it is harder to define deviation, but regulators will still expect reasonable controls.
• System maturity and integration: In brownfield environments with mixed MES/ERP/PLM/QMS stacks, some deviations surface as paperwork issues rather than visible scrap, even though risk is real.
• Validation and change control: In validated or qualified systems, minor configuration changes may still be non-conformances if they bypass defined change control pathways.

The same physical issue (for example, running a furnace 5 °C above target) may be an informal process deviation in one plant and a formal non-conformance in another, depending on how the process is specified, validated, and linked to regulatory submissions or customer approvals.

8. Practical rule of thumb

In practice, treat the following as non-conformance candidates in a regulated, long-lifecycle environment:

• Anything that departs from documented requirements (drawings, specifications, validated parameters, SOPs).
• Anything that cannot be fully reconstructed with evidence (traceability or data gaps).
• Anything that bypasses approved controls (process, system, or organizational) meant to ensure quality or regulatory alignment.

Deciding how to classify and handle each case should be done within your existing quality system, with appropriate traceability, risk assessment, and change control rather than ad hoc judgment.