Find any kind of tank, hijack it, and find some water. Then, drive the tank backwards into the water. For some reason if you drive backwards in water you can drive around, shoot with the cannon, and get out of the water.
Now if you have ever played this game you know what I am talking about, but just in case here is how I beat the Ewan helicopter mission.
Note: make sure you have a helicopter the easiest way is to do some mission for the pirates.
Note: the easiest way to do this is to turn on the invincible cheat code, which can be found on this website
First fly over to where Ewan stands in any helicopter and get out, now go talk to Ewan to start the mission.
Next get in the helicopter you brought with you, make sure Ewan gets in too. Do not go to where his helicopter went down. Instead go along the path that he drives his helicopter along and destroy all of the people and especially tanks.
After that fly over to where it tells you to, land and defend Ewan from the people who attack. Once he has finished repairs get in the helcopter.
If you did it right then all the people who would ordinarily be shoting at you will be dead. All you have to do is wait for him to slowly drive back to base.
Thats it you now have a helicopter pilot.
Major Note: using the invinceible cheat code will not make Ewan helicopter invincble.
Ok. Now the mechanic lady. SHe says something about "if only I had a turret." Then my menu thing pops up. What supply drop or whatever am I suppose to have? Is it like I'm suppose to give somthing to her, for her to finish the cars or something?
Cheats (you will hear a click if you get them right) $1,000,000-Right,Down,Left,Up,Up,Left,Down,Right Fuel-Right,Down,Left,Up,Right,Down,Left,Up Infinite Ammo-Right,Left,Right,Right,Left,Right,Left,Left Infinite Health-Up,Down,Up,Down,Left,Right,Left,Right
Hints Avoid oncoming AA missiles-when the missile is about to hit speed forward (takes a little practice) Helicopter Mission-I had trouble with this one pretty much just shoot at anything that moves. If you still can't beat it then look up Mercenaries 2 walkthroughs Ps2 on Youtube Bombs-Do every money sign you find
If you need help in the game try entering the following bunch of codes to activate their corresponding effect in the game. These codes are entered at the 'Faction' menu by first pressing 'Select' followed by the code. If the Code had been entered correctly you will hear a confirmation sound.