CAT 1 ILS APPROACH
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This is from an FAA friend who is the consummate expert on this stuff. I presume this applies wherever the G/S and VGSI angle are identical:
The TCH must be within 3 feet to be coincident. Unfortunately, the way they set up the VGSI is to generate a TCH for the pilot’s eyes, which is 15 – 20 feet higher than where the ILS is.
In several airports in Australia serving international (wide body) aircraft there is a chart note depicting PAPI MEHT or Mean Eye Height at Threshold. Typically 72 feet. This is because the PAPI installation is further down the runway than a normal PAPI to cater for a long aircraft (wide body) Thus on an ILS 3 degree indication on slope for a Boeing 737 for example, a PAPI will show 3 reds and one while.
