In TI3 SE, if I play Enhanced Armor then bgein a battle spatial and play Emergency Repairs: can I repair my Cruisers ?? I think that they are now Dread -like, isn't ?

That is the way my group has always played the cards.

Direct Hit! can take out any ship with Sustain Damage. (DN, WS, Sol Carrier, or Enhanced Cruiser) and Emergency Repairs can effect those same ships.  It makes thematic since and we have always played it this way.

By the exact wording of the card it would seem that this is not how it should go but my group has decided that this is the way they would play the cards.

Direct Hit! was intentionally and explicitely updated for the expansion.  Since Emergency Repairs was NOT, I would say that ER does not work against other sustain-damage ships.  Just like Nanotechnology explicitely only works on Dreadnoughts and War Suns (and it was an S.E. card, so it was pretty obviously intended to be that way to begin with).

Personally, I think making a house rule to allow Repairs to apply to all ships makes things like Enhanced Armor too powerful.  Dreadnoughts cost 5 resources, making them a hefty investment; War Suns cost 12.  Emergency Repairs is random, but free; a fleet of 6 Cruisers with Enhanced Armor would take 12 hits - which would be boosted to 18 hits if you allowed ER to be used on them; this would make the same 12 resources allow for a whopping 600% damage absorbtion than a War Sun.  12 hits is still 400%, and as such, I don't think ER is really intended to be used with the smaller ships.

As written, the card specifically does say which ships Emergency Repairs applies to; you'd have to make a house rule otherwise.