First pass yield is the percentage of units that complete a process correctly the first time, without rework, repair, or scrap. In manufacturing quality reports it is used to measure process health at a single operation or line segment, often alongside final yield and defect data, because it reveals hidden waste that may otherwise be absorbed by inspection, rework, or scrap loops.
FPY appears in localized quality dashboards, daily production reports, and process-audit summaries. Translators may see it as a KPI label or a formula explanation, and need to keep it distinct from final yield and rolled throughput yield so that plant teams can compare the same metric across languages.
A common mistake is translating first pass yield as 'yield rate' or 'qualification rate' without the 'first time' condition. That hides rework and can turn a process with high final yield but low first pass yield into a misleading success story, especially when the source text uses FPY to justify a root-cause investigation or improvement action.
The EU Machinery Directive requires documentation in the language of the destination market. Safety-related terms must map exactly to the wording of the governing standard.
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