When time starts?
Tower ranger, you mentioned 'The time is measured from the moment at which the previous departure rotates and the Controller will factor in the time it takes the following Medium departure to rotate when giving the Take-Off clearance.'
Does this mean that if separation is 2 mins and controller estimates that after he gives clearance it'll take following aircraft 30 secs to ack, spool up, then roll to where first a/c rotated he will give it after 90sec?
My instinct is that will be similar to if controller did timing by 2 mins from when first a/c started t/o run. Or will that be very different? Appreciate your thoughts