OK, I got some numbers for a 747 landing without anti-skid.
Depends on landing weight, flap setting, wind component, temp, runway conditions, and whether reverse thrust is being used.
For a max landing weight landing: 285,700kg, flaps 30, at sea level on an ISA day (15C), nil wind, with reverse the figures are:
Dry runway: 2,110m
Wet runway: 2,430m
Dry Runway 2 Brakes Inop: 2,290m
Dry Runway A/S Inop: 3,720m
Most large airports have runways this long or a bit more. These distances include the usual safety margins.
I have to get back to him for wet A/S inop numbers. They are probably in the range Ambasaid quoted. but the sultution appears to be to get the plane well below its maximum landing weight.
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