ENGINE CONDITION MONITORING is moving from diagnostics toward prognostics, pushing at least part way toward true condition-based maintenance. Sensors and systems have become very good at forecasting and thus preventing potential failures, saving money on delays and major repairs. But they cannot reliably predict success: How much longer a part or engine can stay on-wing. Engines incur very large expenditures during off-wing overhauls, which happen for one three reasons. First, inspection can ...

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