What part of the flight does 'single-engine climb rate' specifically monitor?

The term 'single-engine climb rate' specifically refers to the aircraft's ability to ascend when one engine is inoperable, which is a critical performance metric for multi-engine aircraft. During this phase, pilots need to be aware of how effectively the aircraft can climb under these adverse conditions to ensure safety and performance standards are met.

Understanding single-engine climb performance is vital during emergency procedures, where a pilot may need to perform a go-around or maintain safe altitude after an engine failure shortly after takeoff. This measurement informs pilots about the aircraft’s performance capabilities and the safety margins available, directly impacting decision-making in critical situations.

In contrast, the descent phase, maneuvering with both engines operational during takeoff, and the approach phase for landing, do not directly pertain to assessing performance under a single-engine scenario, making them less relevant to the specifics of this question.