Helicopter crashes are spawned at random throughout the map. They will never be found in forests and can only be found in the open fields. Since 22.214.171.124, Helicopter Crashes spawn within the game at random times. Multiple helicopter crashes can be found in the same area, but the chance of this happening is very rare.
They can only be looted once until being reset, but they contain some of the best gear in the game. Due to this scarcity, competition for the loot spawns is common. Each site seems to have 6 loot spawns, some of which can be hidden in the ground. Zombies around the site can respawn and have a chance to drop equipment, which is mostly minor grade, but the pilot zombies can carry NV Goggles.