B737 Posted May 16, 2021 Report Share Posted May 16, 2021 Dear all! When we get the result for take off run via performance table or app how it is calculated in relation with thrust and brake setting? 1. Full thrust and brake released when spinned up? Or 2. Brake release, set 40% N1 and after 40% set take off thrust? Because from my view it can be significant difference. Can' t be? Regards Quote Link to comment Share on other sites More sharing options...
Litjan Posted May 17, 2021 Report Share Posted May 17, 2021 According to regulations you have to perform a lineup within a short margin, spool up engines to 40% before brake release, then release brakes and press TO/GA. Calculated take-off thrust has to be achieved before 60kts groundspeed to conform with calculation. A "static takeoff" (with brakes held and full thrust) is not recommended, because of undue stress on landing gear, danger of foreign object ingestion and danger of starting to slip (especially on wet/contaminated surfaces). Cheers, Jan Quote Link to comment Share on other sites More sharing options...
B737 Posted May 17, 2021 Author Report Share Posted May 17, 2021 Dear Jan! Thank you. Which procedure is used in performance chart? Static or the 40%? Question is: I know in the real life is much more difference, but playing in games when the table tells you need 1500 meters for take off and the runway is 1500m. I am not sure that both of the procedures would work. Quote Link to comment Share on other sites More sharing options...
AngelOfAttack Posted April 28, 2022 Report Share Posted April 28, 2022 (edited) As pre FCTM, rolling takeoff with less than 2 seconds 40% N1 stable time have negligible impact on takeoff performance. Edited April 28, 2022 by AngelOfAttack 1 Quote Link to comment Share on other sites More sharing options...
GusRodrigues Posted September 18 Report Share Posted September 18 Just as a side note, on winter ops, you have to step into the brakes and spool your engines up to 75% to have enough rotation to cause any ice buildup in the fan blades to go out with inertia. if braking power is fading, TOGA and release the brakes. 1 Quote Link to comment Share on other sites More sharing options...
Litjan Posted September 19 Report Share Posted September 19 6 hours ago, GusRodrigues said: Just as a side note, on winter ops, you have to step into the brakes and spool your engines up to 75% to have enough rotation to cause any ice buildup in the fan blades to go out with inertia. if braking power is fading, TOGA and release the brakes. And you have to do it for 30 seconds, too - so it is important to let the tower know beforehand, or this will send the next approaching aircraft into a go-around. I also made an announcement to my passengers (and crew) so they would not worry because the engines are roaring but the plane isn´t going. Quote Link to comment Share on other sites More sharing options...
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