The wiring diagram feedback that changed how I approach every job

I've been doing avionics for about 6 years now, mostly on business jets. Last month I was troubleshooting a faulty GPS antenna on a Challenger 350 and spent 3 hours chasing a signal issue that turned out to be a loose crimp. My lead came over and told me stop trusting the wire labels at face value, always tone out each pin before you even start. I changed my process to always verify continuity first thing on every repair now. Has anyone else had a simple piece of feedback that completely sped up your troubleshooting?

3 comments

3 Comments

val_shah1d ago

Is this really that deep though? 6 years in and you were still trusting labels like they're scripture? Sounds more like you got lucky up until now than some mind-blowing revelation. But hey, whatever helps you sleep better at night.

angela_morgan1d ago

Read an article in Avionics News that said something similar about label drift happening way more than people admit. Pre-verifying every connection is just good practice now.

shanec611d ago

Had a buddy who spent like 4 hours tracing a bad ground loop on a King Air 200 last year. Turns out the previous guy had swapped two pins at the backshell and just wrote the labels by hand based on what he thought was right. My friend never questioned the labels until the lead made him tone it out from scratch. He found the swap in like 10 minutes after that. Ngl, he said it was humbling because he’d been doing avionics for 8 years and always assumed the documentation was gospel. Now he tones every single pin before he even plugs a tester in. It’s just one of those simple things that saves a ton of headache once you learn it the hard way.