Let me see if i have this correct as I may have been playing it wrong.
Ships with an Aux firing arc (e.g firespary or YV-666) can use the Aux firing arc to negate Autothrusters.
The reason I ask is we have played it with just primary firing arc. i.e turrets and auxiliary outside the primary arc Autothrusters kicked in.
But I think after re reading the FAQ we were doing to wrong and only turrets (also as a primary weapon) are affected.
"Autothrusters
Autothrusters does not trigger if the ship equipped
with Autothrusters is inside the attacker’s primary or
auxiliary firing arc at Range 1–2.
If a ship with a turret weapon attacks a ship equipped
with Autothrusters, first measure closest point to
closest point to determine range, then use the printed
firing arc on the attacker to determine whether the
defender is in the attacker’s firing arc."