As reasonable as it sounds, one has to wonder why this very seldom required outside the UK and apparently everywhere within th UK...is this a legal problem, e.g. your necks on the block, but, say, a germans atcos neck NOT on any sort of block if operator did not file correctly?
Other q: I do fly under reg, my current airplane is a Cessna Citation Sovereign or C680. What would you consider the best/most correct way to tell you the type?
A) Just 'citation' - they could be Light or Medium
b) Citation Sovereign
or
c) C680
?
For the time being I say C680 - the icao type identifier....