What vertical separation is required for aircraft flying at FL290 and below?

For aircraft flying at Flight Level 290 (FL290) and below, the required vertical separation is 500 feet. This level of separation is typically implemented in controlled airspace where aircraft are operating at altitudes below FL290, to ensure safe vertical spacing between different aircraft.

In this range, the standard practice allows for closer vertical separation compared to higher altitudes, where a minimum of 1000 feet of separation usually becomes necessary. This is due to several factors, such as the increased performance and operational capabilities of aircraft at higher altitudes, which necessitate more substantial separation to account for potential deviations and dynamics in flight.

Understanding this standard helps air traffic controllers manage traffic flows more efficiently and safely at lower altitudes, while also facilitating more flexible routing options for aircraft that are climbing to or descending from higher flight levels.