PSA Airlines Canadair Regional Jet Systems (PSA-CRJ) Practice Exam

When do slats extend in relation to flaps during operation?

1. Slats extend after the flaps

2. Slats extend simultaneously with flaps

3. Slats extend before the flaps

4. Slats and flaps do not interact

The correct answer is: Slats extend before the flaps

Slats are an important aerodynamic device on an aircraft that helps to increase lift during low-speed operations, especially during takeoff and landing. The correct answer indicates that slats extend before the flaps, which is consistent with typical aircraft systems design. When slats are extended prior to flaps, they help to enhance the airflow over the wings and improve the wing’s aerodynamic characteristics. This pre-extension allows the wing to be more effective at higher angles of attack, which provides additional lift when the flaps are deployed. Deploying slats first helps to ensure that when the flaps do extend, the aircraft is ready to take advantage of the increased lift they provide. This sequence is strategically advantageous as it maximizes the aerodynamic performance of the wing during critical phases of flight. The other options imply a different sequence or interaction that does not match the operational protocols followed in most regional jets, including the Canadair Regional Jet. For example, if slats were to extend after the flaps or simultaneously, it could reduce the effectiveness of the flap deployment, as they would not be assisting in enhancing airflow over the wing structure beforehand. The notion that slats and flaps do not interact is also incorrect, as their functioning together is essential for optimized lift during