If you have a rocket launcher available in the game, usually a one-hit will down any helicopter in the game. However, if all you have are firearms, but if you're within range, just aim for the pilot and shoot him - that usually works. However, it will not guarantee any recovery of said vehicle as it will end up in a unflyable state (ruined blades, the helicopter catches on fire and explodes, or plunges into the water, never to return).
Disclaimer: This answer is regarding only as gameplay tips, and please think before doing something you will regret later. Like as the game says, I do not condone replicating into the real world anything mentioned in this answer or any conduct you do within the game in question.
Well Grand theft auto san andreas has lots , but Grand theft auto 4 doesn't it only has helicopter's
you dont
what is it
Get in a helicopter or plane.
helicopter
no
you do a cheat code
At the airport .
there is no cheat for a mini helicopter yet
You go to the airport by the military base to find a helicopter.
Type in "OHDUDE" and you will get a helicopter with weapons.
type this in: helicopterhofid