What is the maximum altitude for flap extension on the CRJ 900?

The maximum altitude for flap extension on the CRJ 900 is 10,000 feet. This limitation is crucial for ensuring the aircraft's performance and safety during various phases of flight, particularly during approaches and landings. Flaps are designed to increase lift and drag, which is essential during lower speed operations typically performed at altitudes closer to the ground. Extending flaps at altitudes above the specified limit could adversely affect the aircraft's structural integrity or aerodynamic performance, especially at higher speeds. Therefore, adhering to this limitation is key for pilots to maintain the safety and handling characteristics of the aircraft during flap operations.