Originally Posted by
slink
From the AIP: 27L PAPI 420M in from THR, MEHT 65ft.
So, the PAPI (roughly in the middle of the touchdown zone, TDZ), is inset 420 metres from the painted threshold (not necessarily the end of the tarmac). The glidepath will "aim" at the same point, being calibrated to achieve this.
If with "glidepath" you also mean the ILS glidepath, this doesn't appear to be so for 27L according to the
PATC, the
Aerodrome Chart and the actual runway markings as visible from
satellite pictures.
The PACT lists the threshold altitude as 56 ft from the runway surface (as opposed to 65 ft for PAPI).
56 / tan(3º) = 1068,5 ft = 325,7 m
Also see the AC and the Google Maps picture. The PAPI line (the western white north-south oriented line drawn on the southern edge of the runway) is about 100 m from the eastern line which marks the position of the ILS GP antenna and aimpoint in relation to the runway). The PAPI line mark is at the start of the visual aiming point markings on the junction with taxiway Victor.
Not that this would make any difference to how much the aircraft fell short, because when flying manually in good weather you would aim more towards the PAPI line and touch down a little bit even after that with a good flare, but just to be really anal about the numbers.