What is RET on Boeing 737? (Retract)

The Boeing 737 aircraft is one of the most popular and widely used aircraft in the world. It has been a mainstay of the aviation industry for decades, providing efficient and reliable transportation for both passengers and cargo. One important feature of the Boeing 737 is its retractable landing gear system, often referred to as RET. In this article, we will explore what retract means on a Boeing 737 and how it contributes to the overall performance and safety of the aircraft.

The Importance of Retract on Boeing 737

The retractable landing gear system on a Boeing 737 plays a crucial role in the aircraft’s operation. It allows the landing gear to be stowed in order to reduce drag and improve the aircraft’s aerodynamic performance during flight. When the Boeing 737 takes off and reaches a safe altitude, the pilot activates the retract system, and the landing gear is retracted into the fuselage. This not only reduces drag but also increases fuel efficiency, allowing the aircraft to fly longer distances with less fuel consumption.

How Does Retract Work?

The retractable landing gear system on the Boeing 737 is made up of several components that work together to facilitate the retract process. Let’s take a closer look at how it works:

1. Hydraulic Power

The retract system on the Boeing 737 is powered by hydraulic pressure. High-pressure hydraulic fluid is used to move the landing gear and associated components. When the pilot activates the retract system, the hydraulic pressure is directed to the actuators, which are responsible for retracting the landing gear. These actuators extend and retract in response to hydraulic pressure, effectively moving the landing gear up or down.

2. Retraction Sequence

Retracting the landing gear on a Boeing 737 follows a specific sequence to ensure smooth and safe operation. The pilot begins by pulling a lever or flipping a switch to activate the retract system. The hydraulic pressure is then directed to the main gear actuators, causing them to retract first. Once the main landing gear is fully retracted, the nose landing gear follows suit.

During the retraction sequence, it is essential to maintain proper synchronization between the landing gear elements. This is achieved through the use of mechanical interlocks and position indicators, which ensure that each gear component moves smoothly and in the correct order. This synchronization is vital to prevent any potential damage to the landing gear or the aircraft’s structure.

Benefits of Retract on Boeing 737

The retractable landing gear system on the Boeing 737 offers several benefits that enhance the aircraft’s performance and overall efficiency:

1. Improved Aerodynamics

By retracting the landing gear into the fuselage, the Boeing 737 reduces drag, which is the force that opposes the aircraft’s motion through the air. This reduction in drag improves the overall aerodynamics of the aircraft, allowing it to fly more efficiently. The improved aerodynamics contribute to lower fuel consumption and increased range, making the Boeing 737 an economical choice for airlines.

2. Increased Fuel Efficiency

The ability to retract the landing gear on a Boeing 737 significantly improves fuel efficiency. When the landing gear is stowed, it eliminates the drag created by the extended landing gear, reducing the aircraft’s overall resistance to airflow. This reduction in drag translates into lower fuel consumption, allowing the aircraft to fly longer distances or carry more payload while using less fuel.

3. Enhanced Safety

Retracting the landing gear on a Boeing 737 also enhances safety during flight. The streamlined fuselage and reduced drag resulting from the retracted landing gear improve the aircraft’s handling characteristics, especially during takeoff and in turbulent conditions. Additionally, the retracted landing gear minimizes the risk of damage during ground operations, such as taxiing and landing.

It is important to note that retracting the landing gear on a Boeing 737 should only be done under controlled and appropriate conditions. The pilot must ensure that the aircraft has reached a safe altitude and that the retraction sequence is executed correctly to avoid any potential mishaps.


The retractable landing gear system, or RET, on the Boeing 737 is a critical component that contributes to the aircraft’s overall performance, efficiency, and safety. By retracting the landing gear into the fuselage, the Boeing 737 improves its aerodynamics, increases fuel efficiency, and enhances handling characteristics. This system allows the aircraft to operate more economically and travel longer distances with reduced fuel consumption. Understanding the function and benefits of the retractable landing gear system is essential for both pilots and aviation enthusiasts alike.

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