A Component Maintenance Manual is a supplier or manufacturer document that describes the approved repair, overhaul, inspection, and testing procedures for a specific aircraft component, along with tooling and materials. It sits below the aircraft-level maintenance manual in the technical publications hierarchy and is used primarily by repair stations and MRO facilities rather than line technicians in routine flight operations.
Translators encounter CMMs when localizing supplier documentation, repair station manuals, and overhaul work instructions. The text often includes shop procedures, tolerances, materials, and nondestructive testing references, requiring careful distinction between repair, overhaul, inspection, and test terminology within a single document. It is frequently cross-referenced with illustrated parts catalogs and time-between-overhauls data.
A common error is translating “repair” and “overhaul” as if they were interchangeable, which obscures whether a component may be returned to service after limited work or must undergo complete restoration. Another error is treating the CMM as an installation manual, but installation data usually belongs in the aircraft maintenance manual or parts catalog.
EASA and CE certification impose language requirements on maintenance and safety documentation. These terms carry airworthiness and liability implications, so they are rendered against the governing standard rather than translated freely.
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