Acceleration
Hi
If an engine failure occurs during the acceleration segment it will apply to both the third and fourth segments, depending at which point in time the failure will take place.
Third Segment: This segment extends from the end of the second segment upon reaching the acceleration altitude not less than 400ft agl, to the completion of flap retraction and acceleration to Vfto. Meeting the 3rd segment requirements means that you can start at V2 and flaps takeoff, and accelerate to Vfto retracting the flaps during the appropriate part of the acceleration, all without any loss of altitude. Airspeed Accelerating to Vfto,
Critical engine Failed, Thrust Takeoff or APR, Flaps Retracting to 0 deg, Minimum Climb Gradient 0.0%
Fourth Segment: This segment begins at the end of the third segment (flaps retracted), and ends at a height of 1500 feet AGL. This segment completes the takeoff path. Airspeed Vfto, critical engine Failed, Thrust Max Continuous, Flaps Retracted, Minimum Climb Gradient 1.2%.
the aircraft performance will be the one shown on the vfto chart or the chart that applies to the speed for final takeoff with the flaps retracted according to the schedule specific to your aircraft (vfto-5 in the case of the cl605), the gear up and the climb thrust, found in the afm in the climb gradient section.
Hope it helps
Baobab