vans,

The F/D really does not do very much in this model. TheF/D and Autopilot are in fact two separate items and only share the radio information unlike in later planes where the F/D and autopilot are connected. The F/D on the 727 does have similar modes like the autopilot and they are supposed to work the same, but I don't think the F/D really does very much.

BTW, the 727-100 is NOT an autoland plane and in the real world must be disconnected by 100 feet on the approach. The -200 has a much newer autopilot.