Originally Posted by
PelicanSquawk
the issue is the 4 reds were probably more around 150ft for me….the ltc in his comments wrote that I was strangely on GS when I got 4 reds. Which is the confusing part I guess, but also the reason he was happy for it to continue.
Yes, I've noticed.
We had been discussing 4 reds being a geometric necessity
- where GS intercet pt. and PAPI have significant lateral shift (150m, more than a 100).
- below roughly 50 feet as the parallel 3 deg path slices through the PAPI segments downwards.
Whereas your airport has
- distance rom GS to PAPI only 70 meters
- you had 4 reds just below 200 feet, around 1 km to runway still.
That is a profile which needs retraining. Or it does not add up.
The piece where you say it was on GS and with 4 reds does not match the puzzle. On a CAT II instalation even less so.
This needs to happen and will when both of the conditions described above are satisified but neither was by your description.