The original helicopter was made by Owen Hewitt for Flight Simulator 2004. I converted it for GTA IV as good as I can and added some details.
This helicopter has the following features:

* three different Lod models
* custom moving rotor models
* four working, angled doors
* independent landing lights, navigation lights, strobes and one beacon on their right position
* wire cutters as extra part
* fuselage bumpmaps for detailed riffets
* 4 car colours
* dirt enabled and mapped
* illuminated instruments
* illuminated cockpit
* working skid
* every window is an independent breakable part
* detailed interior