Air alert

Before Compatriot, we need to destroy a helicopter patrolling the old concrete road to the north within 11 minutes without using the PTRD or Fenrir's CheyTac M200.
== Walkthrough ==
This quest is relatively simple. Just head up to the checkpoint and you should see a helicopter up in the sky, at extreme altitude. Shoot at it to put it on alert and fly lower. Aim at the tail rotor as the vulnerable spot. A high-powered sniper rifle can bring it down in a single hit, an assault rifle will need a few bursts.
Return to Compatriot for the information he promised.
Compatriot says that recently something happened at the C-Consciousness base, some shooting have been heard inside, a helicopter arrived to the base, and they shut the force field down for a short time. One of the scientists escaped and was captured by the stalkers, and is now in the cellar, guarded by Fritz.
== After the quest ==
Descend down the cellar, and speak to the scientist. His name is Andersen, and he tells you that approaching the base without disabling the psi-antennas is impossible. Some unknown people somehow infiltrated it on the helicopter, and took over. He managed to escape when his friend Solvador disabled the field for a couple minutes.
After the talk, a helicopter flies in and drops off the Black Doctor and his bodyguards. Talk to him. He seems to want to work together - you want the girl back, and he wants to reclaim his base. Andersen has a universal key to the antennas, but it has the range of just a couple meters, so you'll need a carrier immune to the effects of the psi-antennas. Someone is bound to know of this person, kicking off Search for Boatswain.
== Notes ==
* The timer immediately stops when the helicopter crashes, so you have plenty of time. If you're being harassed by the pyro- and electro-controllers native to the Generators, spend some time killing them before moving on to the helicopter.
* If you fail to bring the heli down in time, you'll miss the transition and Compatriot's cyclics, but you still have the option to pay him 100000RU for the information.
== Bugs ==