54 minutes ago, Drasnighta said:In the rules.
I don't know why you need to be sarcastic about this.
From the FFG article:
https://www.fantasyflightgames.com/en/news/2019/11/25/the-siege-breaker/
" It should be no surprise, then, that strategies involving the Onager focus on using this armament to deadly effect through ignition attacks—a new form of attack that uses a pool of dice and a special firing arc not associated with a hull zone."
From the Rules Reference Guide, page 2:
"A ship can perform two attacks during it's activation, but it cannot attack from the same hull zone more than once per activation."
"A ship can attack the same target with different attacks."
It seems a reasonable conclusion that the Onager could fire twice, once with the Ignition attack, and once form the front hull zone battery, on the same target, since, per the article above, the special firing arc is not associated with a hull zone.