Hi
Thanks for your answers !
I'm sorry I wasn't clear enough, I meant noise measured from the ground when the aircraft is processing patterns or low patterns !
I suppose it isn't an issue in the USA, as the country is so wide, but here in France, because of the complains of people living near airports, the DGAC (equivalent FAA) has normalized noise measures for many type of general aviation aircrafts :
https://calipso.dta.aviation-civile....terne/#aeronef
They have created 4 classes, from A (low noise) to D (high noise) (application CALIPSO).
I suppose the skymaster must be in class D, because of its 2 blades propellers, but I can't find any skymaster in CALIPSO, as this aircraft is very rare in France.
Anyway, I wonder if the measures are relevant, as you can find CESSNA 172 in all the 4 classes !