RVDT Aviation: Aircraft Flight Control System Quiz and Flashcards

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Questions and Answers

What is the primary function of the aileron force sensors?

To provide data to the FCCs about pilot and copilot actions to override the autopilot servos (correct)

To translate mechanical movement into electronic signals for the FCCs

To provide excitation signals to the transducer

To detect the movement of the control wheel

What type of signal do the force sensors provide to the FCCs?

A voltage signal proportional to the applied force (correct)

A mechanical movement signal

An ARINC 429 data bus signal

An excitation signal to the transducer

What is the purpose of the excitation signal provided by the FCCs to the transducer?

To detect pilot and copilot actions to override the autopilot servos

To provide data to satisfy flight data recording requirements

To generate a voltage signal proportional to the applied force (correct)

To translate mechanical movement into electronic signals

How many RVDT sensors are contained within the RVDT cluster on top of the aileron and elevator control module?

5 Signup and view all the answers

What is the purpose of the RVDT sensors?

To translate mechanical movement into electronic signals for the FCCs Signup and view all the answers

How many aileron force sensors are installed on the aircraft?

2 Signup and view all the answers

Which of the following CAS messages indicates a failure related to the control wheel force sensors?

Roll Control Miscompare Signup and view all the answers

What type of data is likely transmitted on the ARINC 429 data bus to communicate control wheel force data?

Digital data words Signup and view all the answers

What is the purpose of the excitation signal in a control wheel force sensor?

To provide power to the sensor Signup and view all the answers

If the control wheel force sensors fail, which CAS message would most likely be displayed?

Roll Control Miscompare Signup and view all the answers

What is the typical output signal type from a control wheel force sensor?

Analog voltage signal Signup and view all the answers

Which CAS message indicates a failure related to the lateral control surfaces?

L-R Aileron Fail Signup and view all the answers

What is the purpose of the RVDTs (Rotary Variable Differential Transformers) in the provided text?

To provide electrical inputs to the flight computers Signup and view all the answers

How many RVDTs provide data to each of the Flight Control Computers (FCCs) and the Backup Flight Control Unit (BFCU)?

Two sensors provide data to FCC No. 1, two sensors provide data to FCC No. 2, and one sensor provides data to the BFCU. Signup and view all the answers

What is the role of the Flight Control Computers (FCCs) and the Backup Flight Control Unit (BFCU) in relation to the RVDT data?

They use control laws to determine the action to take based on the RVDT data. Signup and view all the answers

What is the purpose of the Remote Electronics Units (REUs) mentioned in the text?

To move the flight control surfaces to the commanded position. Signup and view all the answers

What is the significance of the RVDT cluster returning to neutral only if the main cluster shaft is sheared off?

It indicates a fault condition that requires maintenance. Signup and view all the answers

What is the purpose of the circuit breakers listed in the text?

To protect the system from electrical faults or overloads. Signup and view all the answers

Explain the purpose of the aileron force sensors and how they provide data to the FCCs.

The aileron force sensors are installed along the roll feel system load path for the pilot and copilot. They detect pilot and copilot actions to override the autopilot servos and provide this data to the FCCs. The force sensors satisfy FAA/EASA flight data recording requirements. Signup and view all the answers

Describe the role of the excitation signal provided by the FCCs to the transducer in the aileron force sensor.

The FCCs provide an excitation signal to the transducer in the aileron force sensor. This excitation signal is then received back by the FCCs as a voltage signal that is proportional to the applied force on the control wheel. Signup and view all the answers

Explain how the RVDT sensors translate mechanical movement of the control wheel into electronic signals for the FCCs.

The RVDT sensors contained within the RVDT cluster on top of the aileron and elevator control module translate the mechanical movement of the control wheel into electronic signals. These signals are then sent to the FCCs, which interpret them and send commands to the REU aileron actuators. Signup and view all the answers

What type of data is likely transmitted on the ARINC 429 data bus to communicate the control wheel force data from the sensors to the FCCs?

The control wheel force data from the aileron force sensors is likely transmitted on the ARINC 429 data bus as digital data. ARINC 429 is a commonly used data bus standard for transmitting aircraft sensor data between components. Signup and view all the answers

Explain the purpose of the voltage signal received by the FCCs from the aileron force sensor transducer.

The voltage signal received by the FCCs from the aileron force sensor transducer is proportional to the applied force on the control wheel. This allows the FCCs to monitor the forces being applied by the pilots and detect any override of the autopilot servos. Signup and view all the answers

Describe how the RVDT sensors and FCCs work together to translate control wheel movements into commands for the aileron actuators.

The RVDT sensors within the RVDT cluster translate the mechanical movement of the control wheel into electronic signals. These signals are sent to the FCCs, which interpret the RVDT data and generate the appropriate commands to be sent to the REU aileron actuators to move the ailerons accordingly. Signup and view all the answers

Describe the purpose of the excitation signal provided by the FCCs to the control wheel force transducers.

The FCCs provide an excitation signal to the control wheel force sensors. This excitation signal is used to power the sensors, and the sensors then provide a voltage signal back to the FCCs that is proportional to the applied force on the control wheel. Signup and view all the answers

Explain how the control wheel force data is transmitted from the FCCs to the Flight Data Recorder (FDR).

The FCCs provide the control wheel force data on an ARINC 429 data bus to the MAUs, where the Autopilot (AP) modules reside. The MAUs then transmit this force data on a digital data bus to the FDR, allowing the FDR to record the control wheel force information. Signup and view all the answers

Describe the purpose of the RVDT (Rotary Variable Differential Transformer) sensors in the aileron and elevator control module.

The RVDT sensors in the aileron and elevator control module measure the position of the pilot and copilot control wheels. The RVDT cluster contains five RVDTs that are driven by a common shaft connected to the primary flight control cables, allowing the control wheel positions to be measured. Signup and view all the answers

Explain the significance of the RVDT cluster returning to a neutral position if the main cluster shaft is sheared off.

If the main shaft of the RVDT cluster is sheared off, the individual RVDT sensors will return to a neutral position. This is significant because it allows the flight control system to detect a failure in the RVDT cluster and take appropriate action, such as disengaging the autopilot and returning manual control to the pilots. Signup and view all the answers

What is the purpose of the ARINC 429 data bus in transmitting the control wheel force data from the FCCs?

The ARINC 429 data bus is used to transmit the control wheel force data from the FCCs to the MAUs, where the Autopilot (AP) modules reside. This standardized data bus protocol allows the flight control system to communicate the force data between the different components. Signup and view all the answers

Describe the relationship between the control wheel force sensors and the Autopilot (AP) system.

The control wheel force data is used by the AP system to automatically disconnect and return manual control to the pilots. The FCCs provide the force data to the MAUs, where the AP modules reside, allowing the AP system to monitor and respond to changes in the control wheel forces. Signup and view all the answers

What is the role of the cockpit sensors in the GULFSTREAM G650ER system?

Cockpit sensors generate electronic signals and send data to the Flight Control Computers (FCCs) and Backup Flight Control Unit (BFCU). Signup and view all the answers

How are commands generated for moving flight control surfaces in the GULFSTREAM G650ER?

Commands are based on cockpit control displacement produced by the pilot, copilot, or Autopilot (AP) system servos. Signup and view all the answers

What do the force transducers below the control wheels measure in the GULFSTREAM G650ER?

Applied force on each control wheel. Signup and view all the answers

What prompts the Remote Electronic Units (REUs) to energize actuators in the GULFSTREAM G650ER system?

Voltage signals back from RVDT and force sensors that indicate position and force commands. Signup and view all the answers

How is control wheel force data likely transmitted on the ARINC 429 data bus in the GULFSTREAM G650ER?

Likely transmitted as digital data signals on the ARINC 429 data bus. Signup and view all the answers

What type of signal do the force sensors provide to the Flight Control Computers (FCCs) in the GULFSTREAM G650ER system?

Voltage signals back that are proportional to the applied force and position. Signup and view all the answers

Study Notes

Aileron Force Sensor and Control Module

Two aileron force sensors are installed, one in the pilot's aileron and elevator control module and one in the copilot's aileron and elevator control module.
The sensors provide data to satisfy FAA/EASA flight data recording requirements and detect pilot and copilot actions to override the AP servos.
Each sensor is a two-channel strain gauge that connects to FCC No. 1 and FCC No. 2.
The FCCs provide an excitation signal to the sensors and receive a voltage signal back that is proportional to the applied force.

RVDT Cluster and Control Module

The RVDT cluster contains five RVDT sensors on top of the aileron and elevator control module.
The RVDT sensors translate mechanical movement into electronic signals sent to the FCCs.
The FCCs interpret the electronic signals from the RVDTs and send commands to the REU aileron actuators.
The pilot and copilot control wheel position is measured by the RVDTs.
Each position sensor contains a common shaft along the vertical center line that simultaneously drives all five RVDTs.

System Overview

The system uses multiple dedicated position sensors connected to the control wheels, control columns, and rudder pedals for each pilot station.
Cockpit sensors generate electronic signals and send data to the FCCs, BFCU, AP system, and FDR.
Commands are based on cockpit control displacement produced by the pilot, copilot, or AP system servos.
The FCCs and BFCU provide excitation signals to RVDT and force sensors and receive voltage signals back that are proportional to the applied force and position.

Component Location

Aileron force sensor: 2, located in the forward right side of the aileron and elevator control module.
Aileron control module RVDT: 2, located on top of the aileron and elevator control module, right side.

Circuit Breakers and Power Source

The system is protected by multiple circuit breakers and solid-state power controllers.
Power sources include 28VDC from L ESS, R ESS, L MAIN, and R MAIN.

CAS Messages

Multiple CAS messages are displayed, including FCS Maintenance Required, Roll Control Miscompare, and others.
Messages indicate system failures, miscompares, or maintenance requirements.

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Description

Learn about the connection between channels, FCCs, transducers, and RVDT sensors in an aircraft flight control system. Understand how mechanical movements are translated into electronic signals that help control wheel movements.

Aircraft Flight Control System Overview

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