Originally Posted by
Long Zhiren
In Aerospace engineering, a flight cycle is defined by number of landings, not the number of anything else that happens during a flight.
If you're going to be pedantic, at least be correct. Depending on the purpose for which you're counting cycles, the flight cycle is either one takeoff AND one landing, or it's one pressurization and one depressurization. (There may be other definitions that aren't used as much. There are also engine cycles, which have different definitions.) In practical terms, it doesn't matter because those events are all strongly correlated anyway.