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Spent 4 hours chasing a fuel gauge glitch on a King Air, turned out to be 3 ohms of resistance in a cannon plug pin
I pulled the gauge, tested the sender, checked the wiring runs, and was about to condemn the indicator when a 25 year guy I work with in Wichita told me to wiggle the cannon plug at the wing root while watching the reading, and sure enough the pin had just enough corrosion to add 3 ohms when cold, so now I check plug resistance before I pull a single panel, and I'm wondering how many gauges I've sent back over the years that were actually fine.
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linda_perry1414d ago
I read a NTSB report years ago that listed connector pin corrosion as a top cause of false gauge readings, and it's the kind of thing that never shows up on a test bench. The guy who taught me always said check the cheap stuff first, but I never did until I got burned myself. Now I keep a little chart of expected pin resistance for the common plugs so I can catch it in two minutes instead of pulling the whole panel.
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