Originally Posted by
blastoff
The Regs do not specify this for pilots. It's just style points that most of us don't say it on center since there is good separation at Center altitudes. I have had US Center Controllers call me "Heavy" at altitude, even when it didn't match the exceptions in their Regs
FYI - it used to be a requirement for all controllers to use the word "heavy" when applicable. They no longer require center controllers to use it, but at the same time, they are not barred from using it either. The change occurred about 10-15 years ago.