The hull is what ensures the ship’s continued existence as a ship, so to say that it’s important to protect your hull is an understatement.
Each airship is protected by a layer of armor. Once the armor is destroyed, the hull itself begins to take damage from incoming hits. You can repair and rebuild armor in mid-flight, but damage to the core hull cannot be repaired. If hull health drops to zero, you’re out.
Engineers, always keep an eye on your armor status, and try to keep it in good repair so your hull is not exposed to danger!