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Chasing a ground fault for 4 hours then found a loose screw on the backshell
Last Tuesday on a Gulfstream G550 I spent all afternoon tracking down a intermittent communication fault and finally found the issue was a loose screw on a backshell in the tail cone that was grounding out the coax, has anyone else had a stupid simple fix after a long troubleshooting session?
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ivan_mason1mo ago
That loose screw on the backshell sounds like a classic needle in a haystack. How did you finally narrow it down after four hours of chasing it? Did you end up using a time domain reflectometer or just brute force with the multimeter?
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robert_lopez641mo ago
Ha! Four hours of my life I'll never get back.
@ivan_mason I ended up brute forcing it with the multimeter. TDR would've been overkill for a short like that. Just started disconnecting sections of the harness one by one until the continuity went away.
Found the screw rattling around inside a junction box. Thing must've fallen in during assembly.
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