Originally Posted by Underfire
In order for you to see 2 reds and 2 whites on a 3° glideslope...ie to see both the Unit B and Unit C...
Correct, and that is why your original diagram is wonky, because angle C is shown aligned along 3° (same as ILS GS), not above it. The PAPI on-slope angle is between B and C (as shown above). Your original diagram depicts what looks like a PAPI on about 2.8° with the ILS (I assume) on 3°. They not co-incident in either GPI or slope angle, which is what you said they were.
Originally Posted by OK465
How about ILS 3.00 vs PAPI 3.20?
At last, very good, your wife will now be happy.
The question is, why would such as situation exist? PAPI put in before the ILS? Surely any terrain limitation would affect the ILS GS tolerances more than a visual PAPI, which can be flown super-accurately where the tolerances between each red/white are very small?