Time Between Overhauls大修间隔
Time between overhauls (TBO) is the manufacturer-specified operating interval, usually expressed in flight hours or cycles, after which an engine or major component must be removed and overhauled to restore serviceability. In technical documentation, it appears in maintenance planning documents, engine manuals, service bulletins, airworthiness limitations, and reliability programs as a mandatory or recommended life limit for continued airworthiness and operational approvals.
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Where this term appears
In translation, TBO appears in maintenance planning documents, engine and component maintenance manuals, lease agreements, reliability reports, and airworthiness limitation sections. Translators must distinguish mandatory overhaul limits from recommended or on-condition intervals, and preserve units, calendar limits, and cycle limits because operators and regulators use these values for maintenance scheduling.
Translation checks
A common error is translating TBO as 'total operating time' or 'service life,' which suggests retirement rather than overhaul. Another is presenting the interval as guaranteed or exact for all operators, ignoring that regulatory approvals or operating conditions may change it. This can misstate lease return conditions or airworthiness obligations.
Keep the term aligned across your files
Check procedure sequence, part names, limits and cautions against the supplied references. Applicable aviation or market requirements depend on the product and project pathway.
Provide approved terms and previous translations with the source files. Agree how variants, ambiguous wording and revisions will be reviewed. Terminology maintenance and any termbase handback are confirmed in the project scope. See the 8-step AI + expert workflow.
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Read the published project →Published scope shows related industry experience; it does not confirm that this specific term was used or reviewed in the project.
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