What is LWR DSPL on Boeing 737? (Lower Display)

The Lower Display, abbreviated as LWR DSPL, is one of the essential components of the Boeing 737 aircraft’s cockpit. It is a vital part of the flight deck that provides critical information to the pilots during flight operations. The Lower Display is designed to enhance situational awareness, improve decision-making, and ensure the safe operation of the aircraft. In this article, we will explore the functionalities and importance of the Lower Display on the Boeing 737.

Understanding the Lower Display

The Lower Display on the Boeing 737 is a multifunctional screen located on the center pedestal in front of the pilot and copilot. It serves as a primary source of information regarding aircraft systems, engine parameters, fuel status, and various flight management functions. The display is divided into two main sections: the Engine/Systems Display and the Flight Management System (FMS) Control Display.

Engine/Systems Display

The Engine/Systems Display section of the Lower Display provides real-time data related to the engines and other aircraft systems. It presents information such as engine thrust, temperatures, fuel flow rates, oil pressure, electrical parameters, and hydraulic pressures. The display also indicates the status of various aircraft systems, such as the landing gear, brakes, anti-icing systems, and more.

Furthermore, the Engine/Systems Display provides warnings and alerts in case of any anomalies or malfunctions. It helps pilots monitor the aircraft’s health and take appropriate actions if necessary. This display is crucial for maintaining the aircraft’s performance, ensuring optimal engine operation, and ensuring the overall system functionality of the Boeing 737.

Flight Management System (FMS) Control Display

The Flight Management System (FMS) Control Display is the other section of the Lower Display. It serves as the interface for the pilots to interact with the aircraft’s FMS. The FMS is a highly sophisticated computer system that manages and automates various aspects of the flight, including navigation, performance calculations, and route planning.

The FMS Control Display allows pilots to input and modify flight plans, review and update navigation waypoints, monitor the progress of the flight, and perform other essential functions related to flight management. It provides a comprehensive overview of the flight parameters, including position, speed, altitude, heading, wind data, and fuel calculations.

The FMS Control Display significantly reduces the workload for the pilots by automating many of the tasks traditionally done manually. It enhances the accuracy and efficiency of flight operations while ensuring compliance with air traffic control requirements. The Lower Display’s integration with the FMS plays a vital role in optimizing flight performance and supporting the pilots in achieving safe and efficient operations.

The Role of the Lower Display in Flight Operations

The Lower Display on the Boeing 737 plays a critical role in flight operations. It provides pilots with essential information to make informed decisions and effectively manage the aircraft during all stages of flight.

During takeoff, the Engine/Systems Display section of the Lower Display enables pilots to monitor engine parameters and confirm that all systems are functioning normally. They can quickly identify any deviations or abnormalities and take appropriate actions to ensure the aircraft’s safety.

The FMS Control Display, on the other hand, allows pilots to accurately input the flight plan, set the desired altitude and airspeed, and continuously monitor the aircraft’s position and progress along the planned route. The display provides real-time updates on deviation from the planned path, offering the pilots timely information to correct their course if necessary.

During the approach and landing phase, the Lower Display becomes vital in providing critical data such as airspeed, altitude, and glide slope information to ensure a smooth and safe touchdown. Pilots can also refer to the Engine/Systems Display to verify the readiness of the aircraft’s landing gear, spoilers, and other systems involved in the landing process.

In addition to these operational aspects, the Lower Display is also instrumental in supporting pilots during abnormal and emergency situations. It displays warning messages, system failures, and other critical alerts, enabling pilots to take immediate corrective actions and mitigate potential risks.

Overall, the Lower Display on the Boeing 737 enhances the pilots’ situational awareness, reduces their workload, and ensures the safe and efficient operation of the aircraft throughout the flight.


The Lower Display, or LWR DSPL, is a vital component of the Boeing 737 aircraft’s cockpit. It provides crucial information related to the engine and systems, as well as serves as an interface for the flight management system. Pilots rely on the Lower Display to monitor and manage aircraft performance, navigate accurately, and respond to various flight situations effectively.

The integration of the Lower Display with the engine systems and flight management system enhances the safety and efficiency of flight operations. It ensures that pilots have access to real-time data, warnings, and alerts, enabling them to make informed decisions and take appropriate actions throughout the flight.

As technology continues to advance, the Lower Display on the Boeing 737 will likely evolve to incorporate additional features and functionalities. The goal remains the same – to provide pilots with the necessary information and tools to operate the aircraft safely and efficiently in today’s dynamic aviation environment.

For More: What is AOC on Boeing 737? (Air/Oil Cooler)