Home Boeing Boeing 737 What is LDG ALT on Boeing 737? (Landing Altitude)

What is LDG ALT on Boeing 737? (Landing Altitude)

The Boeing 737 is one of the most popular commercial aircraft in the world, known for its reliability and versatility. As planes are not restricted to a single airport, they need to adapt to various different altitudes during their flights. One important factor to consider is the landing altitude, also known as LDG ALT, which plays a crucial role in the aircraft’s performance during landing. In this article, we will explore what landing altitude is on the Boeing 737 and its significance in aviation.

Understanding Landing Altitude

Landing altitude refers to the elevation or height of the runway where an aircraft touches down during landing. It is measured above mean sea level (AMSL) and is an essential parameter for pilots and flight crews to consider. The Boeing 737, like all commercial aircraft, is designed and tested to operate within certain altitude limits to ensure safe and efficient performance.

Boeing classifies the Boeing 737 into three different altitude categories: low altitude, medium altitude, and high altitude.

Low Altitude Operations

Low altitude operations refer to landings at airports with an elevation below 8,000 feet AMSL. These airports are typically located in regions closer to sea level, such as coastal areas or airports in flat terrains. For low altitude operations, the Boeing 737 follows specific landing altitude guidelines to ensure safe landings.

During low altitude operations, the Boeing 737 uses a fixed landing altitude of 50 feet above the runway threshold. The threshold is the beginning of the runway where the aircraft makes initial contact during landing. This fixed landing altitude helps pilots maintain a consistent approach and landing profile, ensuring a smooth touchdown.

Medium Altitude Operations

Medium altitude operations encompass landings at airports with elevations between 8,000 and 14,000 feet AMSL. These airports are often located in areas with moderate elevation, such as mountainous regions or high plateaus. When operating within the medium altitude range, the Boeing 737 adjusts its landing altitude to account for the higher elevation.

For medium altitude operations, the Boeing 737 uses a landing altitude determined by the airport’s elevation. The landing altitude is calculated based on the airport’s threshold elevation, taking into consideration factors such as atmospheric pressure and aircraft performance. This customized landing altitude ensures that the Boeing 737 performs optimally during landings at medium altitude airports.

High Altitude Operations

High altitude operations involve landings at airports located above 14,000 feet AMSL. These airports are typically found in high mountainous regions or areas with extreme elevations. Operating in such conditions presents unique challenges for both aircraft and pilots.

For high altitude operations, the Boeing 737 utilizes a different landing altitude calculation to ensure safe and efficient landings. The landing altitude is determined based on the airport’s threshold elevation, taking into account factors such as reduced air density and lower engine performance due to reduced oxygen levels at high altitudes. By adjusting the landing altitude accordingly, the Boeing 737 can perform accurate landings while considering the challenging conditions.

Significance of Landing Altitude

The landing altitude on the Boeing 737 is a crucial parameter that directly affects the aircraft’s performance during landings. It plays a significant role in several aspects, including:

1. Landing Distance: The landing altitude affects the required landing distance of the Boeing 737. As the altitude increases, the reduced air density affects the aerodynamic performance of the aircraft, potentially increasing the landing distance required. By considering the landing altitude, pilots can make adjustments to their approach and landing techniques to ensure a safe touchdown.

2. Engine Performance: The landing altitude influences the engine performance of the Boeing 737. At higher altitudes, the reduced oxygen levels result in decreased engine power. Pilots need to be aware of these limitations and adjust their procedures accordingly to ensure a smooth landing and takeoff.

3. Braking and Tire Wear: The landing altitude also affects the braking performance and tire wear of the aircraft during landing. Higher altitudes may require longer landing distances, leading to increased brake usage and potential tire wear. By considering the landing altitude, pilots can make informed decisions to minimize these effects and ensure the aircraft’s safe operation.


The landing altitude, or LDG ALT, is a critical factor in the safe and efficient operation of the Boeing 737 during landings. It varies based on the airport’s elevation and can significantly impact the aircraft’s performance, including landing distance, engine performance, and braking efficiency. Pilots and flight crews carefully consider the landing altitude to ensure a smooth and safe landing, taking into account the specific characteristics of low, medium, and high altitude operations. By understanding and accounting for the landing altitude, the Boeing 737 continues to maintain its reputation as a reliable and versatile aircraft in the aviation industry.

For More: What is PF on Boeing 737? (Pilot Flying)

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