The L1011 was the first widebody civil jet transport to be equipped with an FMS, which provided complete RNAV/LNAV and thrust management modes of operation.
It was manufactured by Hamilton Sunstrand and it provides very accurate TOD information for a variety of descent speeds, M.86
350KIAS/250KIAS or M.82/320KIAS/250KIAS or M.80/300KIAS/250KIAS, or...indeed any combination in between, all pilot selectable.
Want to be 20NM from the airport at 230KIAS?
Simply choose that point as the EOD point, and sit back and watch PFM at work.
It is superbly accurate, even to this day.
And, why not....it's on a TriStar.
Ahhhh....Lockheed.
