What is "level flight" in relation to VNAV?

Level flight refers to the condition when an aircraft is flying at a constant altitude. In the context of VNAV, which manages altitude changes during various phases of flight, level flight is crucial because it indicates that the aircraft has stabilized at a specific altitude after climbing or descending. When operating in level flight, the pilot maintains not only a steady altitude but also balances the lift and weight of the aircraft, ensuring a smooth and consistent flight path.

This is a fundamental concept in aviation, particularly during cruise phases, where maintaining a fixed altitude is essential for air traffic control and safety. Additionally, understanding level flight is key for pilots as it influences navigation decisions and fuel efficiency, highlighting its importance in vertical navigation operations.