What is RVDT on Boeing 777? (Rotary Variable Differential Transducer)

The Rotary Variable Differential Transducer (RVDT) is an essential component found on the Boeing 777 aircraft. It plays a crucial role in measuring rotational movement and providing real-time data to the flight control system. This advanced sensor is designed to accurately convert mechanical movement into electrical signals, allowing for precise control and monitoring of various aircraft systems. In this article, we will explore the functionalities and significance of the RVDT in ensuring the safe operation of the Boeing 777.

Role of Rotary Variable Differential Transducer

The RVDT is primarily responsible for measuring the rotation of specific components on the Boeing 777. When installed, it accurately detects and converts angular displacement into electrical signals. These signals are then used by the flight control system to determine the position and movement of critical parts, such as control surfaces, throttle levers, and landing gears.

One of the key areas where the RVDT is employed is the aircraft’s flight control system. It measures the rotation of control surfaces, such as ailerons, elevators, and rudder, allowing the pilots to maintain precision control over the aircraft’s movement. By continuously monitoring the position and movement of these surfaces, the RVDT ensures precise and responsive flight control, enabling the Boeing 777 to maneuver safely and efficiently.

The RVDT is also utilized in the throttle control system of the Boeing 777. It accurately measures the rotation of the throttle levers, providing feedback to the engine control system. This allows for precise control of engine power and thrust, ensuring optimal performance and fuel efficiency. The RVDT plays a critical role in maintaining the correct power settings during different phases of flight, from takeoff to cruising altitude and landing.

Another crucial application of the RVDT on the Boeing 777 is in the landing gear system. It monitors the rotation of the landing gear during the extension and retraction process, ensuring smooth and reliable operation. The RVDT provides real-time feedback that assists the flight crew in verifying the position of the landing gear, contributing to the safe landing and takeoff of the aircraft.

Advantages of Rotary Variable Differential Transducer

The RVDT offers several advantages that make it a trusted and preferred sensor for measuring rotational movement on the Boeing 777 aircraft:

1. Accuracy: The RVDT is known for its high level of accuracy in converting rotational movement into electrical signals. This ensures precise measurement and control of critical aircraft systems, contributing to the overall safety and performance of the Boeing 777.

2. Reliability: With its robust design and construction, the RVDT is highly reliable even in demanding operational conditions. It can withstand extreme temperatures, vibrations, and other environmental factors, making it suitable for use in various areas of the aircraft.

3. Durability: The RVDT is built to last, offering long-term reliability and durability. Its resistance to wear and tear ensures consistent and accurate measurement throughout the lifespan of the aircraft, minimizing the need for frequent maintenance or replacement.

4. Simplicity: Despite its advanced functionality, the RVDT is relatively easy to install and maintain. Its design simplifies the integration process into the aircraft’s systems, reducing complexity for the engineers and technicians involved.


The Rotary Variable Differential Transducer (RVDT) plays a critical role in the safe and efficient operation of the Boeing 777 aircraft. Its ability to accurately measure rotational movement and convert it into electrical signals provides real-time data for the flight control system. The RVDT ensures precise control of important systems, such as flight control surfaces, throttle levers, and landing gear. With its high level of accuracy, reliability, and durability, the RVDT contributes to the overall safety and performance of the Boeing 777. It is a testament to the advanced technology used in modern aircraft, highlighting the continual innovations that drive the aviation industry forward.

For More: What is DEP on Boeing 777? (Departure)