Takeoff Segments and Climb Requirements with Gross Flight Path and Net Flight Path

This study note covers the information on Takeoff Path, Takeoff Flight Path, Takeoff Segments, Takeoff Climb Requirements along with information on gross flight path and net flight path.

Takeoff Path

Takeoff path extends from standing start to point at which aircraft is at height:

  • of 1500 ft above the takeoff surface, or
  • at which transition from takeoff to en-route configuration is completed and final takeoff speed is reached
  • whichever higher

Final takeoff speed – any speed greater than 1.25 Vs can be chosen as final takeoff speed

Takeoff Flight Path

Takeoff Flight Path begins 35 ft above the takeoff surface at the end of takeoff distance.

Takeoff path and takeoff flight path are regulatory definitions assuming critical engine failure at Vef, no recovery of engine, V2 must be reached before aircraft is 35 ft above takeoff surface and aircraft must continue at speed not less than V2, until it is 400 ft above takeoff surface.

Gross Flight Path

Gross Flight Path is the takeoff flight path actually flown by aircraft.

Net Flight Path

Net Flight Path is defined as gross flight path minus mandatory reduction. Net takeoff flight path data is determined so that they represent the actual (Gross) takeoff flight path reduced at each point by a gradient equal to:

  • 0.8% for two engine aeroplanes
  • 1.0% for four engine aeroplanes


Net flight path is more restrictive.

Takeoff Segments

Take off segments are divided into four parts. We have tabulated the details for easy reference.

Quick Notes:

  • Minimum Climb Gradient Requirement in First Segment – 0% for twin engine and 0.5% for quad engine aircrafts
  • Minimum Climb Gradient Requirement in Second Segment – 2.4% for twin engine and 3% for quad engine aircrafts
  • Minimum Climb Gradient Requirement in Third Segment – not applicable
  • Minimum Climb Gradient Requirement in Final Segment – 1.2% for twin engine and 1.7% for quad engine aircrafts

Takeoff Segments and Climb Requirements

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