What is the difference between gross and net flight paths in takeoff performance?

Gross flight path is the aircraft’s actual demonstrated performance when flown per the manufacturer’s procedures.

Net flight path is a regulatory reduction of the gross path, accounting for safety margins. For two-engine aircraft, the net climb gradient is reduced by 0.8% from the gross gradient.

Obstacle clearance must be ensured using the net flight path, even though pilots will see the aircraft performing along the gross path.