Our loot locking plugin uses a proximity method when locking loot and heli wreckage to the player that downed it.  This is because heli wreckage can be random and there's no way for the plugin to know ahead of time what all will scatter about the debri field.

As with all other loot locking on our server, the lock expires after a set amount of minutes.  Just wait it out and you'll be able to loot and harvest the wreckage.  This is just a byproduct of people calling in helis back to back.  There's nothing we can do about it.