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All credits go to me for finding this.
Get on any level with a Black Hawk helicopter and select the Engineer class with the repair tool. Make sure your in no ones squad (you don't want them spawning to you and taking your helicopter), and then grab a Black Hawk helicopter. Go somewhere you can land, and none of your teammates or enemies can go. I prefer an area that is restricted (when your in the helicopter, restricted areas are smaller).
Now, damage your helicopter as much as you can without making it explode. Now get back in the helicopter or land it if your flying the helicopter (land it in your safe spot, of course). Then switch your position inside the helicopter so your by the door (not on a mini-gun). Now turn all the way around and use your tool on the part of the helicopter that is in the back of your position. Now that may be complicated to understand, so here is a picture:
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You'll get 20 XP for about every 10-20 points you repair on the helicopter. You'll get about 1 thousand XP per 5 minutes.