If a card simply said "repair 1 hull damage" would I be able to discard one damage card of my choice, or would it have to be a face down damage card? i.e. could an effect worded thusly allow me to repair "critical" or face-up damage cards? I don't see why I couldn't, but my opponent argued with me. So, I thought I would ask.

What ability are we talking about here? The only card I can think of which allows you to discard damage cards is R5-D8, and he explicitly states face down damage cards.

As far as I know, no ability specifies the repair of hull damage, because hull damage isn't really a thing... just cards. If it's something homebrew you'd have to ask the author, but lacking some specific text limiting which card you can discard, I'd say you could discard either. Damage is damage, face up or down, and if you can discard damage at your choice with no other restrictions... <shrug>

A card would NOT simply say "repair 1 hull damage." Instead, you'd get a card like crewman Chewbacca that says "Discard a damage card" which may specify face up or face down or say nothing about it and let you choose.

You must be more specific. R5-D8 acts differently than R5 units which act differently than Chebacca which act differently than Determination.

The above posts are correct, there is nothing that lets you repair 1 hull damage.

But if there was such a thing, be it a new card from FFG or a homebrew rule... I'd say it would be a face down card.

I think the short but probably unhelpful answer, as alluded to above, is that no card would ever say that.

"Hull damage" isn't a term that I think is ever used in the game, so randomly introducing it would open a whole can of worms. And I think any similar effect in the game specifies either flipping a face up damage card face down, discarding a face down damage card, or something like Determination preventing any face up damage with the Pilot trait from ever taking effect.

R5-D8 gets rid of one face down damage card so yes you can repair hull damage on a roll of defense dice on a eye or evade

R5-D8 gets rid of one face down damage card so yes you can repair hull damage on a roll of defense dice on a eye or evade

Firstly welcome I see its your second post so your a new member.

Secondly that's not true R5-D8 does not repair your hull it allows you to get rid of a face down card, while you may think its the same and it may have the same effect, the terminology used is get rid not repair. In x wing the use of correct terminology is important.