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

How are flaps connected to the Flap PDU?

1. Via cables

2. Via torque tubes

3. Via hydraulic lines

4. Via electronic signals

The correct answer is: Via torque tubes

Flaps are connected to the Flap Power Drive Unit (PDU) via torque tubes. This connection is essential for the operation of the flap system, as it allows the mechanical movement of the flaps to be transmitted effectively from the PDU, which is responsible for powering the flap movements through hydraulic means. Torque tubes are rigid structures that transmit the rotational force from the PDU to the flaps, ensuring that when the PDU actuates, the flaps respond accordingly by moving to their designated positions for takeoff, landing, or various flight configurations. The use of torque tubes provides a reliable method of transferring motion, maintaining alignment and synchronicity in flap deployment. Understanding the mechanics of how the flap system operates is crucial for maintenance and troubleshooting, ensuring that any issues can be diagnosed accurately and resolved efficiently. Knowing that the connection is made through torque tubes reinforces the importance of mechanical integrity in aircraft systems and the role that these components play in flight safety and performance.