But if you are wondering the category then they are based on Vat wich is speed at treshold about 1.3 times stall speed in landing configuration ,now
I donīt know the ATR but I would guess it is CATEGORY B
A :Vat<91 kts
B :Vat 91/120 kts
C :Vat 121/140 kts
D :Vat 141/165 kts
E :Vat >165 kts
