public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
	if(newkeys == KEY_ACTION && issliding[playerid] == 0 && notstarted[playerid] == 0)
	{
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 497)
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 487)
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 488)
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 563)
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 447)
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 469)
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 417)
		if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 548)
		{
		    //OnPlayerStartSliding (use for other conditions)
		    
		    //end
		    for(new p=0; p<howmanyropes; p++)
            {
				if(issliding[p] == 0) { tempplayerid[playerid] = p; }
			}
			if(tempplayerid[playerid] == -1) { return GameTextForPlayer(playerid,"Technical Problem",1000,1); }
		
	        GetVehiclePos(GetPlayerVehicleID(playerid),helix[playerid],heliy[playerid],heliz[playerid]);
	        issliding[playerid] = GetPlayerVehicleID(playerid);
	        issliding[tempplayerid[playerid]] = 1;
	        notstarted[playerid] = 2;
			GetPlayerPos(playerid,tempx[playerid],tempy[playerid],tempz[playerid]); //alte position speichern
			GetPlayerFacingAngle(playerid,tempa[playerid]);
	        SetTimerEx("checkseil",1000,0,"ifff",GetPlayerVehicleID(playerid),helix[playerid],heliy[playerid],heliz[playerid]);
			vworld[playerid] = GetPlayerVirtualWorld(playerid);
			RemovePlayerFromVehicle(playerid); //spieler aus heli raus
			SetPlayerVirtualWorld(playerid,10);
			ApplyAnimation(playerid,"ped","abseil",4.0,0,0,0,1,0); //animation startem
			SetVehiclePos(chopper[playerid],tempx[playerid],tempy[playerid],tempz[playerid]);
			SetPlayerPosFindZ(playerid,tempx[playerid],tempy[playerid],tempz[playerid]);
			SetPlayerCameraPos(playerid,tempx[playerid],tempy[playerid]+10,tempz[playerid]+10);
			SetPlayerCameraLookAt(playerid,helix[playerid],heliy[playerid],heliz[playerid]);
			TextDrawShowForPlayer(playerid,blind);
			SetTimerEx("lowzcatch",zcatchtimer,0,"ifff",playerid,tempx[playerid],tempy[playerid],tempz[playerid]);

			//OnCalculateZ (use for messages or optical things)
			
			//end
            
			for(new i=0; i<ropelength; i++)
			{
				b_SetObjectPos(seile[i][tempplayerid[playerid]],tempx[playerid],tempy[playerid],tempz[playerid] - i);
			}
			return 1;
		}
		return 0;
	}
	if(newkeys == KEY_ACTION && issliding[playerid] != 0 && notstarted[playerid] == 1)
	{
	    //OnPlayerLetFall
	    
	    //end
	    new Float:landex,Float:landey,Float:landez;
	    GetPlayerPos(playerid,landex,landey,landez);
	    SetPlayerPos(playerid,landex,landey,landez);
	    issliding[playerid] = 0;
	    issliding[tempplayerid[playerid]] = 0;
	    notstarted[playerid] = 0;
	    GameTextForPlayer(playerid,"You let yourself falling",1000,1);
	    for(new i=0; i<ropelength; i++)
		{
			b_SetObjectPos(seile[i][tempplayerid[playerid]],tempx[playerid],tempy[playerid],tempz[playerid] - i);
		}
	    return 1;
	}
	return 1;
}

if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 497)
{
    if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 487)
    {
        if(GetVehicleModel(GetPlayerVehicleID(playerid)) == 488)
        {
            // And so on ....
        }
    }
}

switch(GetVehicleModel(GetPlayerVehicleID(playerid))
{
    case 497, 487 /* etc, etc */:
    {
        // code
    }
}