Pteradon

When a model with Sweeping Attack is within 1" of an Unengaged enemy unit during a Move Manoeuvre (even temporarily), the model’s unit may perform a Sweeping Attack against that enemy unit. This can only be used once per friendly Player Turn.
Resolve the Sweeping Attack when the Move Manoeuvre is completed. The attack hits automatically, and counts as a Ranged Attack.
Each model part in the unit with Sweeping Attack must use it towards the same enemy unit. The attack causes X hits, resolved with the model part’s Strength, Armour Penetration and Attack Attributes, but not Weapons.
If values for Strength, Armour Penetration and additional Attack Attributes are defined in the bracket (Y), these are used instead. In this case, the Sweeping Attack is Unmodifiable.

During Combat Choices a model part can only choose Innate Weapons if it has no other options.
All model parts with Beast, Construct, or Mount come equipped with Innate Weapons as their default equipment and cannot lose them.