Pitch and Thrust Modes Pitch to Speed or Pitch to Path?
Interaction Between AP/FD and A/THR Modes:
Speed (or Mach) can be controlled by pitch or thrust, depending on the phase
of flight. The AP/FD and A/THR cannot control speed simultaneously. Their
interaction is as follows:
— If the AP/FD controls vertical path by pitch - the A/THR system maintains target speed.
— If the AP/FD controls a target speed - the A/THR system controls thrust.
— If no AP/FD mode is engaged - the A/THR system controls SPD/MACH mode.