Question about AA mount survivabillity.

[Aiser50]

So I have been curious for sometimes in regards about slot 1 upgrade Auxiliary armaments mount 1. It clearly gives a 100% survival for all secondaries and AA mounts.

 

During in game matches, you can clearly see which AA mounts on your ships  are still functional by ctrl + cursor over the ships hull image on the left hand screen. Some of the mounts still get knocked out despite the 100% upgrade. 

 

Is there something wrong here or am I missing something?

[Hurlbut]

It just double your AA mounts HP. Meaning you would lose (you will still lose something) less of them to splash damage from a HE shell.

[Nuk_]

It doesn't make them invincible, it merely doubles the survivability.