That question plus what does a stress prevent you from doing?

Stress prevents you from doing actions (uless you are Tycho). It allso meanas it's a realy bad idea to do red maneuvers as that will lead to your opponent selecting a maneuver for you.

So anything that is not an action or red maneuver is fair game even while you are stressed.

So the key word you are looking fort is "action" any ability that lets you do an "action" is stoped by stress and any ability that does not mention "action" is fair game.

Stress prevents you from doing actions (uless you are Tycho). It allso meanas it's a realy bad idea to do red maneuvers as that will lead to your opponent selecting a maneuver for you.

So anything that is not an action or red maneuver is fair game even while you are stressed.

So the key word you are looking fort is "action" any ability that lets you do an "action" is stoped by stress and any ability that does not mention "action" is fair game.

Even if an ability allows you to "acquire a TL" (like Fire Control System) can still be done while stressed because it does not say "perform a TL action".

Vader: Pilot Ability = NO because that is performing action.

Vader: Crew Ability = yes. It triggers when an attack is made

Gunner = yes.

Advanced Cloaking Device = No. It gives you a free action which you can not take while Stressed.

Turr's pilot ability = NO. Attacking allows you to take the selected action but if you are Stressed you can not take the action.

There are many more so if you still have questions about something specific feel free to ask but as noted unless it takes an Action, including free actions, it can generally be done. Red maneuvers do not interact well with Stress.