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.
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change to reopen based on chat: https://chat.stackexchange.com/transcript/message/43627874#43627874 -- copied suggested text given by @Penguin
How are jet engine RPM cycles used to monitor LCF life?
user30003
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