PAPI provides the pilot with a safe and accurate glide slope on final approach to the runway. A row of PAPI light housing assemblies (LHA’s) placed perpendicular to the approach path are seen by the pilot in combinations of red and white to indicate a path that is too high, too low or correctly on slope.
This is an individual PAPI. Normally a set of PAPI lighting system consist of 4 sets on the left and right side of runaway (as u can see on the first picture).
So what the light tells the pilot??
4 reds = You are bloody too low!!
4 White's = You are high :-@
2 White & 2 Red = Great, You are maintaining the glide slope!
Talking about glide slope, reminds me to a quotes..
"The probability of survival is inversely proportional to the angel of arrival, large angle of arrival small probability of surviavl and vice versa!!"
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