Isn't 6000ft a bit short for a fully loaded 727, even at sea level ?
It's really hard to define "a fully loaded 727." Boeing had all sorts of engine and landing gear and weight combinations. I flew that tail in a prior life in the US. It was built for Air Jamaica with -15s, a max TO weight of 197,000 lbs and max landing weight of 164,000 lbs. Quick look at the charts, SL, flaps 15, 27c says the runway limit is about 160,000 pounds.