What is remaining useful life (RUL)?

An estimate of how much life an asset has left before failure.

RUL is the predicted time or usage remaining before an asset reaches a failure state — estimated from condition trends, degradation models and operating context.

RUL turns 'something is wrong' into 'you have six weeks' — enough to order the part, schedule the crew and pick a maintenance window instead of stopping production.

• How it's used