Geth Flyer

Geth Flyers are fast moving geth drones that the geth use for supressions purposes. They appear to serve similar functions to Geth Recon Drones or Geth Assault Drones. They are equipped with a Mass Accelerator Machine Gun.

Geth Flyers are encountered on Virmire during the mission to destroy Saren's base. Captain Kirrahe, leader of the Third Infiltration Unit STG, asks Shepard while the squad is navigating around through the back of the base to keep an eye out for anything that can help them as the salarians assault the front of the base for distraction.

When Shepard gets close to the base, the squadmate that was sent with the salarian teams radios for the teams to bunker down before the flyers return.

Tactics
Because they are similar to Geth Assault Drones and Geth Recon Drones, they do flank enemies so watch your flanks. The Flyers however are easy to defeat because of their position. Shooting or overloading the fuel tanks they are hovering over can take care of them quickly. Even if you don't destroy them all, they are easy to take out, just watch your shielding because they have those machine guns that just rip through shielding.