Deviation
Section 04: Certification Process Mechanics
Definition
A departure from a specified requirement, standard, procedure, or specification. In the certification context, a deviation may refer to a departure from the approved type design data (a production deviation), a departure from an agreed means of compliance or test procedure (a certification process deviation), or a departure from a prescribed regulatory requirement (a regulatory deviation). Each type of deviation has different implications and resolution pathways depending on the context and the authority's requirements.
Where This Shows Up
Deviations in the production context (where a manufactured article differs from the approved design) are handled through the manufacturer's quality system, which must include procedures for identifying, evaluating, and dispositioning deviations. Deviations in the certification context may require revised compliance data, design changes, or regulatory relief.
Primary Sources
FAA requirement for production quality systems to include deviation management.
Related Terms
Need help navigating certification?
Understanding the terminology is the first step. If you need expert guidance on DO-178C, DO-254, ARP4754B, or any aspect of FAA, EASA, or TCCA certification, our team is here to help.