You're English is alright coming from someone in Egypt but don't type in all caps lock and I know you can spell out "please".
Anyway, I believe there are only two tricks ways to get a Maverick. In the PSP version, you can try and use a Faggio to bypass the yellow marker so you can go up to the Maverick and ride it but if you leave the area, then the Maverick will just suddenly blow up. On the PS2 version, you have to use the perfect traction cheat to get a car (Yankee, I believe) on the roof of the LCFR station building and when the helicopter lands, I believe you can get it. There's no way to get a helicopter outside of a mission.