Aircraft Flight Control Systems Quiz

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What type of sensors are installed on each column assembly to detect pilot action?

Force sensors (strain gauges)

How does the REU respond when there is a difference between the demanded and actual ram position?

The REU commands the electro-hydraulic servo valve proportional to the ram error until the control error is reduced to zero.

What is the function of LVDTs in each elevator control surface?

LVDTs provide surface position data to the associated REU.

How do the FCCs receive the detected force changes at the pilot/copilot stations?

The FCCs receive the detected force changes at the pilot/copilot stations through one sensor on each column. Signup and view all the answers

What type of power source does the EBHA actuator have?

Hydraulic Electric Signup and view all the answers

What is the purpose of the stick shaker motors in the Stall Barrier System?

The stick shaker motors shake the control column during an approaching stall before the maximum Angle of Attack (AOA) is exceeded, to provide the pilots with tactile feedback of the approaching stall condition. Signup and view all the answers

How does the FCC control the activation of the stick shaker motors?

The FCC controls the activation of the stick shakers by internally switching the 28 Vdc power to the stick shaker motors. The power for the motors is routed through the FCC and passes through internal switches controlled by the FCC software. Signup and view all the answers

What is the purpose of the AOA limiting function in the Stall Barrier System?

The AOA limiting function allows the pilots to command pitch inputs, but limits the aircraft's Angle of Attack (AOA) to the maximum allowed AOA. This prevents the aircraft from exceeding the stall AOA limit. Signup and view all the answers

How are the elevators controlled to pitch the aircraft around the lateral axis?

The elevators move in unison with each other to control the aircraft's pitch around the lateral axis. The elevators are hinged to the left and right horizontal stabilizer rear beams at various stations along the span of the stabilizers. Signup and view all the answers

What is the purpose of the LVDT sensors installed on each elevator control surface?

The LVDT (Linear Variable Differential Transformer) sensors on each elevator control surface are used to detect the position of the elevator, providing feedback to the flight control computers on the actual position of the control surface. Signup and view all the answers

How do the flight control computers (FCCs) receive information about pilot/copilot control inputs?

The FCCs receive information about pilot/copilot control inputs through force sensors installed on the control columns. These sensors detect changes in the force applied by the pilots, and transmit this data to the FCCs. Signup and view all the answers

What is the purpose of the Electro-Hydraulic Actuator (EBHA) in the elevator control system?

The EBHA is responsible for physically moving the elevator control surfaces in response to commands from the flight control computers. The EBHA converts the electrical signals from the FCCs into the hydraulic power required to position the elevators. Signup and view all the answers

How does the Rear Electronics Unit (REU) respond when there is a difference between the demanded and actual elevator position?

When the REU detects a difference between the demanded elevator position and the actual position, it will adjust the EBHA actuator to move the elevator and eliminate the discrepancy. The REU continuously monitors the elevator position and makes corrections as needed to maintain the commanded control surface position. Signup and view all the answers

What type of power source is used to operate the EBHA actuator in the elevator control system?

The EBHA actuator is powered by the aircraft's hydraulic system, which provides the necessary hydraulic pressure and flow to position the elevator control surfaces. Signup and view all the answers

What types of sensors are installed on the pilot and copilot control columns to detect their inputs?

Force sensors are installed on each pilot and copilot control column to detect the changes in force applied by the pilots. These sensors transmit the force data to the flight control computers, which then use this information to determine the pilots' control inputs. Signup and view all the answers