A few approach plates show a note stating that ‘VGSI and descent angles not coincident’.
I have read about this note on various aviation websites including this one, but I am still looking for more information.
Could somebody kindly answer the following questions:
- What are the typical reasons why it is not possible at certain airports to make the VGSI and ILS descent angle coincident?
- How the pilot is supposed to use the information provided by the note during an approach down to the minimums? Is the note just intended not to make the pilot feel surprised for being somewhat high or low when he or she sees the approach lights?