engine cycle

engine cycle
i. The cycle of events that must be accomplished in the transformation of chemical energy into mechanical energy. The two most common cycles are the Otto cycle, which describes the events of a reciprocating engine, and the Brayton cycle, which describes the transformation taking place in a gas turbine engine. See also Otto cycle and Brayton cycle.
Brayton cycle.
ii. A specific activity in an engine such as from one start to the switch-off of the engine, one advance and retard of the engine, etc. For ease of record keeping within airlines, cycles are recorded as one takeoff and landing. The recording of cycles such as the times the engine has been started and switched off and the times the throttle has been advanced and retarded require special recording procedures for maintenance runs.

Aviation dictionary. 2014.

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