Component Cycle Life Calculator

Because the damaging event is the stress cycle, not the steady state: rotating components see their peak loads at start/spool-up/shutdown, pressurised structures at each pressurisation, landing gear at each landing. Fatigue life consumes per cycle, so the limit is written per cycle. That's also why mission profile dominates: thirty-minute legs accrue cycles at four times the rate of two-hour legs for identical airborne time.

No — retirement times in the airworthiness limitations are regulatory, and a part past its life makes the aircraft unairworthy regardless of measured condition. There's no borescope or NDT result that extends them. The only flexibility is administrative: verified records occasionally recover cycles a conservative assumption had thrown away, which is one more argument for the back-to-birth paper trail.

Count actual flights (or starts/landings as your part's counting rule defines) over the last 60–90 days and convert to monthly. Definitions matter per part: some count engine starts, some flights, some landings — touch-and-goes may count for gear and not for engines. Use the counting rule from the limitations section, and when in doubt count conservatively; cycles you under-counted come out of the safety margin.

No account and no connection are needed once the page has loaded — records live in local storage on your device and every calculation runs in your browser. Data doesn't sync between devices, so export the CSV when you want to move or archive your records.

A plain CSV with one row per entry and labelled column headers — the most portable format there is. Spreadsheets open it directly, most specialised software can map it on import, and a printed copy is perfectly legible to a human reviewer. Nothing proprietary means your component plan is never trapped here.