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45.8ft span is equivalent to a 7 metre parking radius.

You didn't specify FS9 or FSX. For FS9, the radius is specified in the air file.

You didn't specify FS9 or FSX. For FS9, the radius is specified in the air file.
As said the radius value is taken from the .mdl file.
The air file itself has a span entry but that's not used for FS9.

Why don't you use Afcad2 to modify the "radius" ?
Does that plane park correctly at other airports? My guess is that it does, which points to some problem at this airport.