OK, up front:
Fuses are for the 12v DC power
Breakers are for the 120v AC power
If the AC power is all off, it has nothing to do with the fuses. That leaves the breakers.
If it were just the breaker for the air conditioner, all the other outlets would still work. Conversely, if something plugged into one of the other outlets tripped the breakers for the outlets (one is the GFCI breaker and the other powers the rest of the outlets), then the air conditioner (or microwave since you have to chose in a 1983 Airstream) would work.
That means that either the main 30 amp breaker is tripped or bad, or the outlet to which you have the Airstream's main power plugged into is no longer functioning. Try turning everything off and switching the main breaker completely to off and then back to on. Sometimes they can trip and look like they are still in the on position. To reset them they have to be moved to the off position and back. Hopefully, you will get power back to the outlets. Then you can try switching the air conditioner on. Start with the small loads.
If that doesn't work, check the outlet for the main Airstream power. Using an adapter
, (Assuming that you are plugging into a 30 amp outlet. You are, aren't you?) you could plug in something like a circuit tester
to verify that the outlet is working. If there's no power there, the problem is outside the Airstream anyway.
(One exception the the separation of the AC and DC systems is the refrigerator. While the AC and DC are completely separate in the fridge, the refrigerators that have the automatic switching systems to require some 12v DC to power the circuit board that tells the refrigerator to switch to either propane or 120v AC. If you have the same one that was in my 1983 Excella, it is a Dometic RM 1303 AES (Automatic Energy Selector system, AES for short) and will be this kind. According to the Dometic manual, 1983 was the first year for the AES. However, blowing the 12v fuse for whatever reason should have no effect on your AC power.)