GS vs PAPI/NPA vs PAPI
Would appreciate opinions regarding the following;
Flying a 3 deg slope often seems to put you low on the PAPI, why?
If flying low on the PAPI, what effect would it have on the touch down point and subsequent landing distance?
When should you transit from the GS to the PAPI?
Flying a NPA, should you continue on approach profile or transit to PAPI upon visual reference?
Thanks.