Investigation: Test Flight | Walkthrough The Bureau Guide

Barnes may be found in the Engineering.

Investigation Test Flight is a simple logic riddle. When you talk to Barnes in Engineering, move to the Avenger via stairs on left. Launch the Focus mode and look for three leaks. To find them, you have to aim at highlighted placed and use a scanner (in PC version it's made by F button).

When you scan the system, a schematics will appear.

If you do everything well, you'll reveal all three leaks. Scan each of them to find the most broken channel (screen above).

Only the valve on left should be turned off.

Go onto the board of Avenger and approach three pipes on left. Turn off the first of valves, the rest must remain untouched (screen above).

The proper combination.

Exit the vehicle and turn left, entering a small platform with switches. Turn off the first and the last one, the middle one should be turned on (screen above).

After all, return to Barnes and report to him. When you complete another random Operation, you get an access to new distraction mission: Flight Test.