Originally Posted by
ophir
I have to ask. What is it they are looking for in this question? The colors of the PAPI or VASI?
I believe glideslopes used to be described as having a blue and yellow lobe and the LOC/GS display in the cockpit actually had blue and yellow on it. I used to use the same analogy when teaching instrument and CFII students, the idea being to "make the perfect green" ie. being on the glide. I haven't seen a ILS receiver with the blue and yellow on it in years though.