What is LAN on Boeing 737? (Local Area Network)

The Local Area Network (LAN) on the Boeing 737 is a crucial component that facilitates communication and data transfer between different systems and devices within the aircraft. As an interconnected network, it allows for seamless information flow and coordination among various onboard systems, ultimately contributing to the efficient operation and safety of the aircraft.

Boeing 737, a popular commercial aircraft used worldwide, incorporates advanced avionics and communication systems. The LAN serves as a backbone for these systems, enabling them to exchange information in real-time, enhancing situational awareness for the flight crew, and supporting the precise operation of essential functions such as flight controls, communication systems, navigation aids, and more.

Benefits and Applications of the Local Area Network

The Local Area Network offers several benefits and enables various applications on board the Boeing 737.

1. Integrated Avionics and Systems

The LAN on the Boeing 737 integrates avionics and systems, allowing for efficient communication and coordination between these components. The flight management system, autopilot, thrust management system, and other systems rely on the LAN to exchange data and execute commands accurately and promptly.

For example, the LAN enables the exchange of data between the flight management system and the autopilot, ensuring precise navigation and automatic control of the aircraft during different phases of flight. This integration results in improved flight performance and reduces the workload for the flight crew.

2. Communication Systems

The LAN on the Boeing 737 plays a crucial role in facilitating communication between various onboard systems and external entities. It allows for seamless integration of communication systems, including voice communication, data link communication, weather radar, and other avionics.

With the LAN’s assistance, the flight crew can access critical information, such as weather updates, NOTAMs (Notices to Airmen), and communication with Air Traffic Control (ATC). This enhances their ability to make informed decisions and ensures effective communication with ground-based entities for a smoother and safer flight operation.

3. Maintenance and Monitoring

The LAN on the Boeing 737 facilitates maintenance and monitoring activities by enabling the exchange of data between different aircraft systems and ground-based maintenance systems.

Engine performance data, flight data parameters, and various system health monitoring parameters are continuously transmitted through the LAN. This allows for real-time monitoring of critical systems, early detection of anomalies or faults, and proactive maintenance planning.

Moreover, when the aircraft lands, the LAN’s connectivity enables automatic upload and download of maintenance data to and from the ground-based systems. This seamless transfer of information enhances operational efficiency, reduces turnaround time, and supports effective maintenance practices.


The Local Area Network (LAN) on the Boeing 737 is a fundamental component that enables seamless communication and data exchange between different systems and devices within the aircraft. It integrates avionics and systems, facilitates communication with external entities, and supports maintenance and monitoring activities.

The LAN enhances the overall operational efficiency, situational awareness, and safety of the Boeing 737 by enabling real-time information flow and coordination among critical functions. As technology continues to advance, the LAN’s capabilities and applications on the aircraft will further evolve, contributing to even more efficient and optimized flight operations.

For more information on the avionics and communication systems on the Boeing 737, refer to Boeing’s official website here.

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