I heard this the other day:
APP Controller: N...XX. Be careful of the base of controlled airspace at FL65.
Pilot: Errrrrr...... Roger. Climbing to FL65. N...XX
APP Controller: FL65 is the BASE of controlled airspace. Remain below FL65.
Is that an example of the controller not knowing that if the base of controlled airspace is FL65 then an aircraft at FL65 is in uncontrolled airspace. i.e. Where a higher class of airspace overlies a lower class then ther dividing level is taken to be the lower class?
Clearly in that case the N pilot was more aware of the situation than the controller!!
