Lucas Bernacer, aeronautical engineer: "Airplanes use radio frequency systems to facilitate safe landings."

Before a plane touches down, pilots recite a series of numbers: 50, 40, 30, 20, 10. While it may seem like a simple countdown, these numbers represent much more than the time remaining until landing. Each number corresponds to the plane's actual height above the ground, measured in feet, and allows pilots to know exactly how far they are from the runway so they can fine-tune their descent.

To obtain this information, aircraft are equipped with a radio altimeter, a device that emits signals toward the ground and measures the time it takes for them to reflect back. This calculation allows the aircraft to accurately determine the altitude above the runway at any given time, which is crucial for landing.

@lucasbernacer 🔊 What does this countdown mean on airplanes? If you've ever been in the cockpit or watched a recorded landing, you've probably heard a voice say, "50... 40... 30... 20... 10" just before touching down. Today I'll explain what the automatic callout system is on an airplane, how the radio altimeter works, and why these height indications are crucial for pilots to make a safe and smooth landing. ðŸ'‰ Do you like airplanes, engineering, and curiosities? Don't forget to follow me for more content. #curiosities #airplane #engineering ♬ original sound - Lucas Bernacer

Thanks to these instruments, pilots can plan each phase of the descent. The information from the radio altimeter helps determine the appropriate speed, flap position, and engine power—all essential elements for ensuring a smooth and safe landing.

The precision of these systems is vital, especially in adverse weather conditions such as rain, fog, or strong winds. Each countdown number serves as a reference to ensure the plane reaches the ground safely, minimizing risks and errors.

In addition to safety, these calculations contribute to passenger comfort. By planning millimeter-precise descents, sudden movements inside the cabin are avoided and the feeling of discomfort is reduced, making the landing experience much more pleasant.

The radio altitude meter and the step-descent technique allow pilots to perform precise maneuvers even on short runways or at complicated airports, where every foot of altitude counts. This makes the famous countdown an indispensable tool for modern aviation.

Ultimately, the 40, 30, 20, 10 sequence is not just a pre-landing ritual, but a fundamental technical element. Thanks to the combination of advanced technology and flight experience, each landing can be carried out accurately, safely, and comfortably for all passengers.