form49
I was interested in your reply. We seem to do it slightly differently on the other side of the fence (mil). For your example given a QNH of 1000MB, and a TA of 6000' (its actually 3000' where I am), then we would calculate the TL as being the first available FL above the TA, which would be FL65, giving a T Layer of 110', and a Minimum Flight Level for use of FL70.
I understand the rationale ensuring that you have at least 1000' vertical seperation - my question is, why do we do it differently?