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 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 GRADIENT = GROSS GRADIENT – GRADIENT PENALTY
Net flight path is more restrictive.
Take off segments are divided into four parts. We have tabulated the details for easy reference.
- 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
Note : right click to save the image