What is the purpose of defining Go Around N1?

Defining Go Around N1 is essential because it specifically indicates the thrust setting that should be applied during a go-around maneuver. When a pilot decides to discontinue an approach and perform a go-around, utilizing the appropriate thrust ensures that the aircraft can gain altitude and ensure a safe climb away from the runway. This N1 setting is critical for performance calculations and maintaining control of the aircraft as it transitions from descent to climb. Understanding the correct thrust to use helps pilots manage engine power efficiently, ensuring a safe and effective go-around procedure.

In contrast, the other options refer to different phases of flight and thrust settings that are not relevant to the go-around maneuver specifically. For example, thrust used for takeoff is different and set to provide maximum performance at launch, while cruising thrust level pertains to maintaining altitude during cruise flight. Measuring thrust during landing involves different considerations focused on maintaining stability and control near the ground.