Originally Posted by dg800
must always be based on maximum structural TOW as per certification
- I think you misunderstand the wording? 'Certified' means as presented on a certificate and does NOT refer to manufacturer's 'certified' MTOW. Thus if an a/c is 'certified' at a MTOW lower than the manufacturer's max that is the 'certified' MTOW for Eurocontrol charging. Most airlines (including the big ones) do this - the way you see it, there is no point.
Read cyrano:
"
In the case of multiple certificated take-off weights, the MTOW to be declared
must be the highest weight authorised by the State of registration." which is that provided to the state by the operator and refers to specific airframes, not a 'type'. As cyrano says, this applies to lots of other charges too.