A method for operating a rotorcraft comprising a first engine and a second engine configured to provide motive power to the rotorcraft, the method comprising: operating the rotorcraft in a first flight regime in which both the first engine and the second engine provide the motive power to the rotorcraft; wherein the method further comprises: receiving a request for entering into a second flight regime in which the first engine is operated in an active mode to provide the motive power to the rotorcraft and the second engine is operated in a standby mode to provide substantially no motive power to the rotorcraft; determining a target output power range for operation of the first engine and the second engine that is required in the first flight regime as a requirement for entry into the second flight regime; producing, via a flight display in a cockpit of the rotorcraft, a graphical representation (410, 420, 430) of the target output power range required in the first flight regime for entry into the second flight regime; and conditioned upon an operation of rotorcraft in the first flight regime meeting the target output power range for the first engine and the second engine for entry into the second flight regime, causing the rotorcraft to enter the second flight regime. operating the rotorcraft in a first flight regime in which both the first engine and the second engine provide the motive power to the rotorcraft; wherein the method further comprises: receiving a request for entering into a second flight regime in which the first engine is operated in an active mode to provide the motive power to the rotorcraft and the second engine is operated in a standby mode to provide substantially no motive power to the rotorcraft; determining a target output power range for operation of the first engine and the second engine that is required in the first flight regime as a requirement for entry into the second flight regime; producing, via a flight display in a cockpit of the rotorcraft, a graphical representation (410, 420, 430) of the target output power range required in the first flight regime for entry into the second flight regime; and conditioned upon an operation of rotorcraft in the first flight regime meeting the target output power range for the first engine and the second engine for entry into the second flight regime, causing the rotorcraft to enter the second flight regime. receiving a request for entering into a second flight regime in which the first engine is operated in an active mode to provide the motive power to the rotorcraft and the second engine is operated in a standby mode to provide substantially no motive power to the rotorcraft; determining a target output power range for operation of the first engine and the second engine that is required in the first flight regime as a requirement for entry into the second flight regime; producing, via a flight display in a cockpit of the rotorcraft, a graphical representation (410, 420, 430) of the target output power range required in the first flight regime for entry into the second flight regime; and conditioned upon an operation of rotorcraft in the first flight regime meeting the target output power range for the first engine and the second engine for entry into the second flight regime, causing the rotorcraft to enter the second flight regime.