In IL2/Pacific Fighters, when you're lit up on fire, your vision starts to redden from being wounded more and more.
Never played it, but something like that would be cool.
Maybe have the cockpit fill with smoke so the pilot cant see.
Maybe have the cockpit fill with fire, and if the pilot doesn't bail he dies in a pre-determined time.
Maybe have the metal in the cockpit change colors to red, to simulate it heating up. Then have the controls take a crap, as the wiring harness melts.
Maybe have the pilot automatically bail after a pre-determined time, because he doesn't want to "die".