Which of the following actions indicates a successful climb or descent initiation?

A successful climb or descent initiation is best indicated by using a gradual angle of bank. This technique allows for a smooth transition into the climb or descent without causing excessive altitude or airspeed changes. A gradual angle of bank helps maintain coordinated flight and ensures that the aircraft remains stable, which is crucial for both safety and performance during these critical phases.

In contrast, making abrupt changes to thrust can lead to unwanted altitude loss or spike and may result in a stall if the aircraft is not properly managed. Maintaining a constant pitch attitude can be part of the process, but it does not directly confirm the initiation of a climb or descent; instead, pitch attitude needs to be adjusted appropriately based on the desired flight path. Adjusting the throttle continuously can also be beneficial during the climb or descent; however, it does not by itself signify a successful initiation; it’s more an aspect of maintaining the desired performance once the climb or descent has begun. Thus, the use of a gradual angle of bank is the key indicator that demonstrates the correct approach to starting a climb or descent.