What the four red and white lights near the runway mean

The PAPI system: a simple and reliable visual reference for the pilot during landing, and why knowing about it changes the sense of flight reliability.

The four red and white lights to the left of the runway threshold are the PAPI (Precision Approach Path Indicator) system, a simple and reliable visual reference for pilots during landing.

It allows the pilot to understand whether the aircraft is above or below the set descent path without taking their eyes off the runway. If we see all lights as red, we are lower than required. All white means we are higher than required. Two red and two white lights mean we are exactly on the glideslope.

Interestingly, the lights do not change color by themselves: this effect is achieved through an optical system. Mirrors installed in front of the PAPI lights shape the color so that depending on the viewing angle, the pilot sees either white or red.

Why this is important to know

Often, in the mind of a person with a fear of flying, flight is perceived as something unreliable, where something could definitely have been missed or forgotten to be checked, where much depends on chance and one can only hope to arrive.

However, reality is quite different. Even the PAPI lights are part of a well-thought-out and precise system.

The feeling of insecurity that a person with a fear of flying experiences is not related to airplanes, but has much deeper roots. Often it is associated with early experiences of instability and lack of protection gained in childhood. The good news is that this is correctable.