TIL a bad ground wire can make a 737's TCAS go haywire
I was working a night shift at a maintenance hangar in Phoenix, doing a routine transponder check on a 737. Everything looked fine on the bench, but when I power cycled the TCAS, it started throwing false traffic alerts non-stop. Turns out a ground screw in the rack had corrosion so bad it was barely making contact. I spent 45 minutes chasing ghosts before I pulled the rack and found it. Replaced the screw and cleaned the terminal, and the system came right back. Has anyone else run into weird avionics glitches from a simple ground fault?