What defines a glide descent?

A glide descent is characterized by a scenario where the aircraft descends primarily due to gravity, and this occurs when drag exceeds thrust. In this situation, the aircraft is not producing enough thrust to maintain level flight or climb, so it enters a state where it is descending. This is commonly seen in situations where an aircraft is intentionally gliding, such as during emergency procedures when engine power is not being applied.

Understanding this concept is essential for pilots, particularly in managing energy and maintaining control over the aircraft. A glide descent is typically performed in a controlled manner to maintain the best glide speed, which can help in maximizing distance traveled during the descent.

The characteristics defined in other options do not align with the principle of a glide descent. For instance, a descent with engine power applied would indicate that thrust is still functioning, leading to a power-assisted descent rather than a glide. Similarly, while a controlled rate of descent is important in various flight maneuvers, it does not inherently define a glide. Lastly, a steep descent with high speed might indicate other conditions such as a dive or a rapid descent but does not encapsulate the essence of a glide, which is specifically about descending without the aid of thrust.