How do flaps 4 and 5 differ in purpose?

Flaps 4 and 5 serve distinct roles in the flight phases of an Embraer Regional Jet. Flaps 4 is primarily used during the takeoff phase, enabling the aircraft to achieve the necessary lift at a lower speed. This configuration enhances the aerodynamic efficiency and increases the angle of attack, allowing for a smoother and safer takeoff, particularly on shorter runways or in limited performance scenarios.

On the other hand, Flaps 5 is designed for landing. When the flaps are extended to this setting, the increase in camber and area of the wing improves lift characteristics at lower speeds. This is crucial during approach and landing, allowing the aircraft to maintain control and stability while descending towards the runway.

Understanding the purpose of each flap setting enables pilots to optimize aircraft performance during different phases of flight, thereby improving safety and efficiency.