Control of Traffic

Question 1

How are cruising levels normally allocated to aircraft with reference to flight planned levels and priorities?

Answer 1

Normally, the cruising level requested in the flight plan is to be allocated. If the flight planned level is not available, the nearest appropriate vacant level is to be allocated.

When two or more aircraft are at the same cruising level, the preceding aircraft shall normally have priority.

An aircraft at a cruising level shall normally have priority over other aircraft requesting that level.

Question 2

What level must not be allocated? (Do not go into detail with actual levels, semi-circular/quadrantal rules and airway/upper ATS routes specifics)

Answer 2

FL195 must not be allocated as a cruising level.