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

What role does the Flap PDU serve in flap operations?

1. Acts as a safety lock

2. Controls flap deployment speed

3. Converts electrical signals to hydraulic motion

4. Maintains flap position

The correct answer is: Converts electrical signals to hydraulic motion

The Flap Power Distribution Unit (PDU) is crucial in the flap operations of the Canadair Regional Jet. Its primary function involves converting electrical signals from the flight control systems into hydraulic motion necessary for the deployment and retraction of the flaps. When the pilot inputs a command to adjust the flaps, the PDU processes this electrical command and activates the hydraulic system to move the flaps to the desired position. This conversion process is vital because it directly translates the pilot's intentions into mechanical action without requiring the pilot to manage hydraulic pressures or mechanical linkages directly. The efficiency of this system not only enhances the response time of flap adjustments but also ensures that the flaps can be operated smoothly and effectively during various phases of flight, such as approach and landing. Understanding the role of the PDU emphasizes its importance in interfacing between the electrical and hydraulic systems of the aircraft, illustrating how modern aircraft systems are designed for ease of operation and safety.