This side-mission can be found by entering the Normandy’s galaxy map and having the ship travel to the following location:
Pylos Nebula > Nariph > MSV Broken Arrow.
Scan the point of interest in the system to dock with it to begin the mission.
As you board the ship, a small countdown timer will appear in the bottom right corner of the screen. Keep that in mind as you move through the level as there is a 6 minute time limit to get in, stop the crash and get out again.
Bypass the first door and destroy the three Geth Troopers inside. Grab the Med Kit and the canister of Iridium on the left side of the room and use the console on the right to open the next door.
Continue through the now open door, along the walkway and down the ramp at the end.
As you reach the bottom, eliminate the Geth that appear on the balconies to the left before checking out the canister of Refined Iridium close to the bottom of the ramp. Turn around and activate the power coupling behind you. Again Geth troops will spawn on the balconies, so deal with them. Continue down the ramp opposite the canister of iridium you picked up before.
Cruise up the ramp into the other side of the room; once more Geth will spawn and attack above, so eliminate them before hitting the console on the second power coupling . If you are low on time, ignore the Geth and run to the top of the nearby ramp and bypass the console here to restart the engines and complete the mission.