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Mass Effect 3 Hints
How can I disable the left AA gun?
1 of 7: Past a ramp, look for some ammo, then turn left to find the top of a ladder.
2 of 7: Go down the ladder, then turn right and run down to a spot near the end of the platform where you could cover-climb onto it. Take cover there instead, and start firing on the nearby geth.
3 of 7: Your position makes it impossible for them to use the mounted turret against you, so you should be able to take them down fairly easily.
4 of 7: Cover-climb onto the platform and shoot down any remaining geth, then turn left to find the "AA Gun Control" terminal. Before you use it, look for a "Jamming Tower Data" terminal along the wall on the opposite side of the area. Its data is needed for a hub mission.
5 of 7: Use the gun control terminal and assign a squad member to disable it, then sprint over to the mounted turret and use it.
6 of 7: Turn to the right and start shooting the geth as they enter the area. When you see the geth prime, focus on him until he goes down, then finish off the rest.
7 of 7: After the AA gun is disabled, the locked doors that provide a shortcut between the two gun platforms will open and release a couple more geth (if this is the first AA gun you've disabled).