Originally Posted by NotaLOT
Since aircraft then decelerate after passing 4 DME, naturally the separations will deteriorate
...at which stage 'reduced separation in the vicinity of an aerodrome' can be applied.
A whole raft of conditions applies before nats' 2.5nm spacing can be applied. The final arbiter is the Air Arrivals controller...who could well be sitting on the edge of his/her seat throughout...
To achieve 2.5nm on the localiser the separation on the base leg has to be extremely tight at about 2nm because half a mile is lost in the turn. If separation drops below the SMF parameters to 1.99nm the SMF will punch the number two director out of his/her seat and into the office, no tea, no biscuits. Is it really worth laying one's licence on the line for one's employer...
Maybe Gonzo will have something to say about 2.5nm 'separation'...