Does anyone know the Stage 4 criteria? Numbers?
BTW, the Sov is stage 4 IF you used the newer (2009) TCDSN...
We have the Stage 3 certificate (A7)... I`ll try to get the stage 4 thing (A2489)
EASA - European Aviation Safety Agency
Thanks couldn't remember what the 680 was, I watched one go off for the first time the other month and was amazed at how quiet it was....
Cant be said for that lovely howl on start up though!