Some French aircraft have acceleration displayed during take-off roll - so just check value at 60 kts, mentally compare with the one you prepared before and which is written down on the take-off card... relatively easy.
Then now people can make mistake in the calculation of that desired acceleration, the same way they would do for the other values !
Believe it or not, a reason against using acceleration for performance checks, is the number of pilots uncomfortable with the picture, and how it works. Speed, weight and time is usually enough for so many colleagues... if you don't believe, check people around.
Same thing for deceleration when talking about landing : how many can write down the couple of physical formula by heart - and use them ?
Last edited by Reinhardt; 25th Aug 2012 at 19:09.