Plain English Meaning
Someone who really knows aircraft maintenance — well enough that others rely on them to teach it, check it, or answer hard questions about it.
Full Definition
An aviation maintenance subject matter expert is a person with deep, recognized knowledge and practical experience in maintaining aircraft — typically a certificated Aviation Maintenance Technician (AMT) whose expertise qualifies them to instruct, evaluate, or advise on maintenance procedures, regulations, and standards.
Context Anchor
Seen in instructor training when discussing how teachers use experts to support lessons outside their own strongest area of knowledge.