Ok, so how does this apply?

Zeb (crew) - "Enemy ships inside YOUR FIRING ARC that you are touching are NOT CONSIDERED to be touching you when either you or they activate during the Combat.

What part of "YOUR FIRING ARC" applies if equipped with secondary weapons?

Say for example: 4 TIE fighters, each one is touching and facing a different side of the Ghost.

1) Chopper(Ghost) is equipped with a TORPEDO, he attacks with his PRIMARY at the one in front, does the one in the back get to attack the Ghost? ["Special arc" for torpedoes]

2) Chopper(Ghost) is equipped with a TURRET, he attacks with his PRIMARY at the one in front, do all of the TIEs get to attack the Ghost? [Turret is 360° arc]

In both cases, all of the fighters get stressed due to Chopper's ability.

Would it matter on who attacks first?

3) Chopper(PS3) fired his only torpedo out the forward arc, (assuming Phantom is not docked at the time) does the TIE(PS1) in the rear still get to attack the Ghost that same turn?

Firing Arc is the Primary Firing Arc. So, even with a ship equipped with a turret that can fire outside the Primary Firing Arc, the ability triggers off the Primary Firing Arc. So, unless the enemy craft is within the Primary Front Arc, it is considered touching.

Firing Arc is the Primary Firing Arc. So, even with a ship equipped with a turret that can fire outside the Primary Firing Arc, the ability triggers off the Primary Firing Arc. So, unless the enemy craft is within the Primary Front Arc, it is considered touching.

Correction: Auxiliary Arcs always count as Firing Arcs.

If an enemy ship is in your rear arc, even if you don't have a Torpedo to fire at them, they are not considered touching.

Turrets ignore your firing arc, and so are irrelevant to the discussion.

Yeah Auxiliary arc's count. Assuming that the Ghost has an Auxiliary arc and not something else, which I think is a safe assumption...

Here's some stuff from the FAQ.

Autothrusters does not trigger if the ship equipped with Autothrusters is inside the attacker’s primary or auxiliary firing arc at Range 1–2.

The auxiliary firing arc of the Firespray-31 is a firing arc.

“Backstabber” only rolls the additional attack die granted by his ability if no portion of his base is inside any of the printed firing arcs on the defender’s ship token.

The Backstabber really is the best precedent for the Ghost. So with Zeb, only those tie fighters that are in inside the printed firing arcs would count.

As far as the Turret, again only the printed arc's count, a turret does not have a 360 deg arc, rather it can shoot outside it's printed arc.

Firing Arc is the Primary Firing Arc. So, even with a ship equipped with a turret that can fire outside the Primary Firing Arc, the ability triggers off the Primary Firing Arc. So, unless the enemy craft is within the Primary Front Arc, it is considered touching.

Correction: Auxiliary Arcs always count as Firing Arcs.

If an enemy ship is in your rear arc, even if you don't have a Torpedo to fire at them, they are not considered touching.

Turrets ignore your firing arc, and so are irrelevant to the discussion.

Maybe this is why it is a "special" arc as opposed to an "auxillary" arc?

Maybe this is why it is a "special" arc as opposed to an "auxillary" arc?

We don't know what that arc actually is called. Those articles are always full of errors and incorrect terms. There may be no such thing as a 'special' arc, and all non-primary arc's are considered auxiliary. But per the FAQ for Backstabber any arc printed on the card counts.

We don't yet have the rules for the ghosts special arc, so we don't really know how exactly it will work for assorted corner cases like this. IF it were an auxiliary arc, it would count as a firing arc for all these purposes, but it quite explicitly isn't being called an auxiliary arc, it is called a special arc, and has a different icon and such and we simply don't know what that means yet.

Ships with turrets have regular ~90* firing arcs, they simply also have a special rule that allows them to ignore it. You determine in arc or not with a turret ship the same way you would a ship without a turret.