An 8D should not be triggered for every non-conformance. In regulated, high-mix operations, it is typically reserved for higher-risk or recurring issues: safety or airworthiness impact, regulatory or customer escapes, significant cost or delivery impact, chronic repeat issues, or systemic process failures. Specific thresholds must be defined in your QMS and applied consistently, with clear criteria, ownership, and integration to NCR, MRB, and CAPA workflows.