I have tested it further and i believe i have found a solution
I found that it did not matter what i destroyed, or even if i destroyed it. If a vehicle was destroyed in my field of vision or vicinity, it caused an exception. im not sure if buildings fall under the same category, but i dont believe they do.
Every time it crashed it was directly after an explosion.
I went into the options, and Disabled the Damage particle FX, the Explosion particle effects, and the Explosion fragments. I then proceed to try the scenario again
not only did i destroy the friendly gunship, but i was able to destroy many buildings and other vehicles without it causing an exception.
i have not tested this throughly yet, but it was the first time in my entire UC and UCG experience that i have died of natural causes in an Instant Action scenario, the first time i have ended a scenario without it hanging.
if it comes up again, i will investigate and post the details.