The "Charley Model" Huey Gunship I flew in Viet Nam was armed with two 9-shot rocket pods and two .30 calibre miniguns.
The miniguns were each capable of firing 3,000 rounds a minute.
Continuous firing at that rate would literally melt the barrels on the guns, so there was a relay in the system that would only allow the guns to fire for three seconds, then the "interrupter" would shut the guns down.
To fire again, you had to release the trigger, then pull it once again.
This system worked well to keep excited Gunship Co-Pilots from turning the six barrels into the consistency of cooked spaghetti.
Normally the Co-Pilot would fire the mini-guns,
the Aircraft Commander would fire the rockets......a nine-rocket pod mounted on each side of the aircraft, next to the the miniguns.
I found a video on the minigun here that illustrates their awesome power.
As you watch, keep in mind that between each of the red tracer rounds that you see are three "ball" rounds that you cannot see.
Therefore, what you see leaving the gun is only 1/4th the actually rounds striking the target.
Another thing.......no helicopter would actually fly down a target line like you see here.
The video demonstrates the lethality of the gun, but in the real world the pilot would use whatever means necessary to avoid being brought down by surface to air missiles or small arms fire.
These new weapons systems can be computer assisted, making the manually adjusted system in the old "Charley" look pretty inaccurate. Still, I wouldn't have wanted to be on the receiving end of my attention in that old bird.
(Thanks to Compfused.com)