What is SEB on Boeing 737? (Seat Electronics Box)

If you’ve ever flown on a Boeing 737 aircraft, you may have noticed a small box located underneath your seat. This box is known as the Seat Electronics Box (SEB), and it plays a crucial role in the operation of various systems on the airplane. In this article, we will delve into the details of the Seat Electronics Box, its functions, and its importance in ensuring a safe and efficient flight.

Understanding the Seat Electronics Box (SEB)

The Seat Electronics Box, sometimes referred to as the Passenger Seat Electronics Box (PSEB), is a unit installed underneath each passenger seat on the Boeing 737 aircraft. It serves as a data and power distribution hub for various electronic components in the seat, such as the in-flight entertainment system, passenger call buttons, reading lights, and other seat-related functions.

The SEB is responsible for managing the power supply to these components, as well as relaying control signals from the seat to the aircraft’s central computer systems. It acts as an interface between the passenger and the aircraft, allowing passengers to control their individual seats’ functions, such as adjusting the position, lighting, and requesting assistance.

Key Functions of the Seat Electronics Box

To better understand the importance of the Seat Electronics Box, let’s take a closer look at its key functions:

1. Power Distribution

The SEB is responsible for providing the necessary power to the various electronic components in the passenger seat. This includes the seat motors for reclining, the heating elements for seat heating, and the LED lights for reading and ambient lighting. By managing the power distribution, the SEB ensures that each seat receives the appropriate power supply for its respective functions.

Moreover, the SEB also regulates the power flow to prevent any electrical faults or overloading, which could lead to malfunctions or fires. It incorporates various protective circuits and monitoring systems to ensure the safety and reliability of the seat electronics.

2. Data Communication

In addition to power distribution, the Seat Electronics Box also facilitates data communication between the seat and the aircraft systems. This allows passengers to interact with their seats through built-in control panels or touchscreens, where they can adjust settings, call for assistance, or access in-flight entertainment options.

The SEB acts as a gateway for data exchange, transmitting the passengers’ commands or selections to the central computer systems of the aircraft. It ensures that the correct signals are sent, received, and processed, enabling seamless operation of the seat functions.

3. Fault Monitoring and Reporting

Another crucial function of the Seat Electronics Box is monitoring the health and status of the seat components. It has built-in sensors and diagnostic capabilities that constantly check for any faults or abnormalities in the electronic systems.

If a fault or malfunction is detected, the SEB can communicate this information to the aircraft’s maintenance systems via data links, allowing the crew to be informed about the specific issue and take appropriate action. This proactive approach to monitoring helps minimize potential downtime and ensures a reliable seating system for passengers.

The Importance of the Seat Electronics Box

The Seat Electronics Box is an integral part of the Boeing 737 aircraft, as it enables the functionality and control of various passenger seat features. Its reliability and performance are paramount to providing a comfortable and safe flying experience for passengers.

Moreover, the Seat Electronics Box contributes to the overall efficiency of the aircraft by optimizing power distribution and reducing wiring complexity. By centralizing the control and power supply functions, the SEB simplifies the wiring harnesses and minimizes the weight and maintenance requirements of the aircraft.

It is worth mentioning that the Seat Electronics Box is just one component of a complex network of systems and electronics on the Boeing 737 aircraft. Each component works in synchronization to ensure the smooth operation of the aircraft’s various functions.


The Seat Electronics Box is an essential part of the Boeing 737 aircraft, providing power distribution, data communication, and fault monitoring for the passenger seat electronics. Its reliability and performance play a crucial role in delivering a comfortable and enjoyable flight experience for passengers.

Understanding the functions and importance of the Seat Electronics Box gives us a glimpse into the intricate systems that make modern aircraft safe, efficient, and passenger-friendly. With continuous advancements in technology, we can expect further enhancements and innovations in the field of aircraft seat electronics.

For More: What is CMC on Boeing 737? (Central Maintenance Computer)