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change to reopen based on chat: https://chat.stackexchange.com/transcript/message/43627874#43627874 -- copied suggested text given by @Penguin
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How are jet engine RPM cycles used to monitor LCF life?

Can someone please define what are N1 and N2 throttle cycles? These are used to keep track of the accumulated low cycle fatigue (LCF) life of rotating components. But I cannot find an exact definition of them.