What is MTCHG on Boeing 777? (Matching)

Matching (MTCHG) on the Boeing 777 is a critical process that ensures the equalization of airplane system inputs and outputs across multiple flight control computers. It plays a crucial role in maintaining flight safety and ensuring optimal performance. In simple terms, Matching helps balance the workload among the various systems and ensures they function harmoniously throughout the flight.

Matching is particularly important on the Boeing 777 because it is a fly-by-wire aircraft, meaning the flight controls are electronically operated rather than directly linked with physical cables. This advanced control system allows for greater precision and efficiency in flying, but it also necessitates rigorous monitoring and coordination of the control surfaces and systems.

So, how does Matching work? Let’s explore the details of this crucial process on the Boeing 777.

The Functionality of Matching

Matching ensures that the control surfaces, including the ailerons, elevators, and rudder, move proportionally to the pilot’s inputs. It achieves this by monitoring the position and movement of these surfaces and comparing them to the inputs from the pilots. If any inconsistencies are detected, the Matching system intervenes and adjusts the control surfaces accordingly.

Additionally, Matching is responsible for managing the various flight control modes and protections of the Boeing 777. These include Normal Law, Alternate Law, and Direct Law. Each mode offers different levels of automation and protection, depending on the flight phase and situation. Matching ensures that these modes transition smoothly and accurately, enabling the flight control systems to adapt to different flight conditions.

Furthermore, Matching plays a pivotal role in the integration of the Flight Management System (FMS) with the flight control computers. The FMS calculates and provides guidance for various flight parameters, such as airspeed, altitude, and route. The Matching system coordinates the inputs from the FMS with the control surfaces, ensuring that the aircraft follows the intended flight path and performs the necessary maneuvers accurately.

Moreover, Matching contributes to the overall safety of the Boeing 777 by continuously monitoring the health of the flight control computers. It compares the outputs of each system and detects any anomalies or discrepancies. In case of a fault, the Matching system can isolate the affected system and reroute the control inputs to the remaining functional computers, allowing the aircraft to continue operating safely.

The Importance of Matching for Flight Safety

Matching is paramount for maintaining flight safety throughout the operation of the Boeing 777. It ensures essential redundancy, allowing the aircraft to tolerate failures in the flight control system while still providing adequate control and stability.

Further, Matching enhances the aircraft’s ability to handle abnormal and emergency situations. By continuously monitoring the control surfaces’ movements and ensuring their accurate response to the pilots’ inputs, the Matching system provides crucial support during critical flight phases, such as takeoff and landing.

Moreover, Matching contributes to operational efficiency and reduces pilot workload. By equalizing the workload among the flight control computers, it enables smoother interactions between the pilots and the aircraft, allowing for more precise maneuvering and improved fuel efficiency.

Overall, Matching is an integral part of the Boeing 777’s advanced flight control system. It ensures optimal performance, safety, and efficiency, making it an indispensable component of this world-class aircraft.

For More: What is MLS on Boeing 777? (Microwave Landing System)