What is TRC on Boeing 777? (Thermatic Rotor Control)

The Thermatic Rotor Control (TRC) is an innovative technology incorporated in the Boeing 777 aircraft. It plays a crucial role in ensuring the efficient operation and performance of the aircraft’s rotor system. The TRC system utilizes advanced control algorithms and sensors to optimize the helicopter’s lift and reduce vibrations during flight. This article will delve deeper into the workings of Thermatic Rotor Control and its impact on the Boeing 777’s flight characteristics.

How Does Thermatic Rotor Control Work?

The Thermatic Rotor Control system on the Boeing 777 employs an array of sensors and actuators to continuously monitor and adjust rotor blade pitch and position. The primary objective of the TRC system is to maintain the optimal rotor performance under varying flight conditions, including changes in altitude, airspeed, and maneuvering.

TRC accomplishes this by dynamically adjusting the collective and cyclic pitch of the rotor blades. The collective pitch control allows the pilot to control the total lift generated by the rotor system during climb, descent, and hover. On the other hand, cyclic pitch control enables the pilot to adjust the lift distribution across the rotor disk, facilitating precise maneuvering and stability.

Using inputs from various sensors such as airspeed, altitude, and gyroscopic data, the TRC system calculates the optimal blade pitch and position to achieve the desired aircraft performance. This information is then fed to the actuators, which make the necessary adjustments in real-time.

One noteworthy aspect of the TRC system is its ability to operate in different flight modes. The Boeing 777 features multiple flight modes, including normal, hover, and auto-rotation. In each mode, the TRC system adapts the rotor control algorithms to ensure optimal rotor performance and stability.

Benefits of Thermatic Rotor Control

The Thermatic Rotor Control system offers several key benefits to the Boeing 777 aircraft and its operators. Here are some of the notable advantages:

1. Enhanced Safety: The TRC system enhances flight safety by reducing vibrations and improving stability. This ensures smooth and controlled flight operations, minimizing pilot workload and fatigue. Additionally, the system’s ability to adapt to various flight modes enhances the helicopter’s responsiveness in critical situations.

2. Improved Performance: The TRC system optimizes the rotor performance, resulting in improved fuel efficiency and lower operating costs. By automatically adjusting the rotor blade position and pitch, the system reduces drag and maximizes lift, allowing the helicopter to achieve better climb rates, faster cruise speeds, and enhanced maneuverability.

3. Reduced Maintenance Requirements: The advanced control algorithms and real-time adjustments offered by the TRC system help reduce the wear and tear on rotor components. This leads to decreased maintenance requirements, lower downtime, and increased operational readiness.


The Thermatic Rotor Control (TRC) plays a significant role in optimizing the operation and performance of the Boeing 777 aircraft’s rotor system. By continuously monitoring and adjusting rotor blade pitch and position, the TRC system ensures efficient lift generation, reduced vibrations, and improved flight characteristics. The incorporation of TRC in the Boeing 777 contributes to enhanced safety, improved performance, and reduced maintenance requirements. This innovative technology showcases Boeing’s commitment to developing advanced solutions that elevate the capabilities of their aircraft fleet.

For More: What is F/E on Boeing 777? (Flight Engineer)