747-400 Landing Rwy Length Requirements

[GILLTECH]

I hope it is ok to post this question here. This forum seems to be full of knowledgable folks about this aircraft.

I am working on some code to update minimum required runway length for 747's based upon a table. I have been reviewing a 3.4.2 FAR Landing Runway Requirements graph for lenths based upon landing weight, pressure alt, and flap settings. The rwy lengths seem short to me based upon documentation I have read before in other forums. Here are the rwy lengths listed on the graph for flaps 30 on a dry runway. (rwy length numbers in ft and approx as measured from graph)

Code Select Expand

Wt/Alt SeaLv 2000 4000
x1000
475 5294 5588 5940
500 5529 5881 6175
525 5823 6116 6469
550 6058 6410 6763
575 6234 6645 7027
600 6528 6939 7292
630 6880 7262 7644
I am wondering if anyone can tell me if these numbers are stopping distance once on the ground or if they are the actual runway length requirment to land and include thresholds or other paved areas of the runway not actaully used to stop. I have actually seen these numbers represented in Port Authority documents to get approval for funding for airport improvements but I am pretty sure I have seen airline docs that perhaps reflect airline policy for longer runways that what i see here?

thanks for any perspective provided.

Mark



hoppie provided table formatting