Abstract:

It is significant to confirm the optimal en-route climbing opportunity for flight safety and efficiency improvement.
Take the crossing separation standard of Beijing control area as an example, aircrafts'required longitudinal
separations before crossing flight levels are calculated by programming according to several typical models of
aircrafts, takeoff weights, flight levels and other relevant factors, then the separations are corrected by
considering speed change of aircrafts and the optimal opportunity for en-route climbing is defined. The result
improves ATC's work efficiency and increases air traffic flow; meanwhile, it is worthwhile for capacity evaluation
and airspace planning.

Key words: en-route climb, flight safety, separation standard, air traffic flow