Originally Posted by Extricate
does it mean if I follow the G/S, the PAPI will become 3 reds at some point?
Yes, fairly close in though.
13ft vertical is equivalent to 247ft long the runway. Have a play with my Glidepath spreadsheet
here.
You can work out what you'll see using the angles of each light; assuming it's a PAPI:
That image came from this document:
https://web.archive.org/web/20230301...0914_13813.pdf