https://www.boldmethod.com/learn-to-fly/maneuvers/should-you-use-the-vasi-on-your-final-approach-every-time-or-fly-the-numbers-to-touchdown/
PAPI https://fr.wikipedia.org/wiki/Indicateur_de_pente_d%27approche
VASI https://en.wikipedia.org/wiki/Visual_approach_slope_indicator
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