Originally Posted by Galaxy flyer
The plane MUST be operated within its certification rules which includes the WAT limit of 2.4% climb gradient to a minimum of 400' AFE.
Correct, except that the climb gradient of 2.4% is for the "thrust available at the time the landing gear is fully retracted". Since thrust reduces with altitude, the gradient at 400' is usually somewhat less than 2.4%. The WAT limit requirements of 25.121 are related to, but also distinct from the takeoff path requirements of 25.111.
Skky is probably a 'troll' who knows perfectly well that it's illegal to operate an airplane outside its operating limitations.