It wasn’t the one I was looking for, but the scene in True Lies where Schwarzenegger arrives in a Harrier and then uses the plane’s 30mm cannon to pan across the floor of the skyscraper is really well-done, especially considering how clunky a lot of the other setups in the movie are.

If you ignore the terrible 90s cinema score, it’s a short, tight bit that realistically shows how absolutely devastating a 30mm cannon is (that is a totally different beast than a rifle or even a “normal” machine gun), and is also dramatic and effective.

In reality, though, a Harrier can only hover for about 90 seconds before its reserve of cooling water is depleted and then the engine basically melts down. In the movie, it hovers for multiple minutes. So not very realistic in that sense, if you know a lot about Harriers.

I could not find a definitive answer, but I am not sure the Harrier can actually fire that big fucking gun while hovering. The 30mm cannon produces so much thrust (more than the engine, I think) that I suspect it’d destabilize the plane while hovering or at least push it back quite a lot.

But still, the scene really works and watching parts of True Lies, you can see where the Wachowskis picked up ideas for a little movie that came out five years later called The Matrix.