727. Auto Pilot
Thank you avenge
SP-50 and SP-150 are the only two I have seen documented but have seen also SP-100
According to its AFM limitations it is certified fown to 80 ft in IMC and 50ft VMC and certified for use with one eng. out. It has to be OFF for two engine out. This beasy can do a single eng go Around no hassles provided speed is good around 200kts and in trim.
Yes a rather ancient AP. I saw some on tge mide selector knob you press for Mach Hold. I guess that was the same function for speed hold.That was ln the SP-150 block. This more modern version had a vertical speed wheel similar to those on 747 Classics. It also had Alt Sel and HDG slect buttons rather than toggle switches.
Those rquipped with Autothrottles: was speed controlled by Speed bugs. EPR was controlled by the EPR "set" knob gauge bug drivers I suppose.By setting the bugs and selecting the AT switch to ON it automatically rolled the throttles to the target EPR on takeoff or only after manual setting if the throttles by tge PF and FE?