I'm probably wrong as usual BUT....
1. Hasn't the "Heavy" bit been in the AIP 'Phraseology' section for years? I seem to remember it in the 'taxy calls' section back when I actually used to read that stuff. I'd always wondered why so few people used it!
2. I fly an aircraft under 20 tonnes. When I have minimum separation on the aircraft in front, I want to know what type of aircraft it is that I am following. A callsign such as Qantas 123 doesn't give me this info. Qantas 123 'heavy' does. I guess you could say that enhances my SA. Wake turbulence can be pretty ugly. Yes, ATC are meant to give us prescribed separation but why not be ready to handle the unexpected?
Just my amateur thoughts.
