Originally Posted by JD832

The "Tail Strike Avoidance" is a fly-by-wire function for takeoff and landing flaps 5 or 6. During landing, it measures the height above ground level measured at the mains using two RA's to limit the pitch in the up direction by restricting the control column authority and for takeoff it uses vertical speed. The system is engaged within 20ft for T/O and 70ft and below for landing.