Why is it that the speed either hangs above the commanded airspeed or below it ?? (via the window or FMC). It seems very rarely the A/T keeps up with what you want, particularly bothersome when you have to keep it within Mach .02 across the ocean. Could it be to do with the 1 g autopilot or am I just grasping at straws yet again ??
BTW does everyone adjust speed via the cost index or hard code the speed ? we do the former for cost savings. Not that I would know any better !!
