A slip is an out-of-balance flight condition used to increase sink rate and lose excess airspeed while maintaining a constant altitude and a specific track over the ground. This statement is:

The statement regarding a slip describes an out-of-balance flight condition that indeed affects a plane's descent and airspeed. However, the assertion that a slip maintains a constant altitude is not accurate. In a slip, the aircraft's control surfaces are utilized in a way that can lead to a change in altitude due to the altered aerodynamics and increased drag. The primary purpose of using a slip is to increase the rate of descent or lose excess airspeed, which is essential in scenarios such as approaching a landing or navigating around obstacles.

While the slip allows for maintaining a specific track over the ground, it doesn’t inherently mean that altitude remains constant; rather, it typically results in a loss of altitude unless corrective measures are taken. Thus, the statement does not fully align with the principles of aviation regarding flight maneuvers, making it false as presented.