Sorry, no professional contribution but a simple question of an interested slf/ ppl-holder:
in case something goes wrong during t/o-roll, like enigens donīt produce calculated thrust, thrust calculation itself or powersetiing was wrong, how do pilots realise it before itīs too late?
Are there checks like:
certain speed has to be gained at halfway down the runway or v1 has to be reached at a certain point (down the runway)?