Spandex your not getting it !
Yes you have to have 15m centre line lighting to perform the takeoff we are in total agreement over that. What you don't do is taxi down the runway to get to them if you already see at least 3 sets of very large touchdown lights in front of you ! The reason you need to have the centre line lighting is because that's a legal MINIMUM. You are not going to have the far larger touchdown lights all the way down the runway are you. So at some point on the takeoff you sure will need those minimum 15m centre lights. The lighting system all joins to together if you look at it.
and as far as performance goes well no we wouldn't be able to work it out would we if you have taxied past the only point it was based on.
Last edited by 8che; 2nd Nov 2013 at 01:02.