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

What component is primarily responsible for the extension of slats?

1. Flap actuators

2. Dedicated slat actuators

3. APU systems

4. Battery systems

The correct answer is: Dedicated slat actuators

The component primarily responsible for the extension of slats is dedicated slat actuators. These actuators are designed specifically to move the slats, which are aerodynamic surfaces located on the leading edge of the wings. Slats improve the airflow over the wing at lower speeds and enhance the aircraft's lift characteristics during takeoff and landing. Dedicated slat actuators are necessary because they provide the precise control and force needed to extend and retract the slats reliably and efficiently. Unlike flap actuators, which are used for moving the trailing edge flaps, slat actuators focus solely on the leading-edge devices. This specialization ensures that the operation of slats does not interfere with other flight control systems, allowing for better performance and safety. The other options do not play a direct role in the extension of slats. Flap actuators are specifically for the trailing edges of the wings. APU systems are auxiliary power units that provide energy for various aircraft systems when the engines are not operating, and battery systems serve to power electrical components, but neither is involved in the mechanical operation of slats.