wrote on Oct 10^th, 2013 at 8:46pm:

It only follows LNAV since there isn't an auto throttle system on the 727.

The Autothrottle is available in the 727. It is actually usable, but you need to ARM it first (the default Keyboard Command is CTRL+SHIFT+R). I modified mine (for testing purposes) so that I don't need to ARM the A/T first by editing the aircraft.cfg.

Open the aircraft.cfg in Notepad, find the [autopilot] section, change autothrottle_arming_required=1 to autothrottle_arming_required=0, then you don't need to ARM the A/T.

Pressing CTRL+R (default Keyboard Command for turning the A/T ON) sets the speed to that which the 727 is doing when you pres CTRL+R. The Speed Bug doesn't control the A/T, so unless you can use the ISG A/T to control the 727's speed, I guess it might be pointless using it. Pressing CTRL+R a second time turns the A/T OFF, so you can use the throttle controls to increase/decrease the speed, the press CRL+R again to reset it to the new speed.

This is really cheating, but it sure could come in handy! NOTE: I don't use A/T in the 727 myself, so I'm just letting you know that it IS there and IS available for use. ;)