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Found a weird trick for stuck AN fittings on a Cessna 172's fuel line
I was working on a 1978 Cessna 172's fuel selector valve in our hangar last week, and the lower AN fitting was seized solid. Instead of cranking on it with a wrench and risking damage, I tried something my old instructor mentioned once: a 50/50 mix of automatic transmission fluid and acetone. Brushed it on, let it sit for about 20 minutes, and it broke free with way less effort. Anyone else have a go-to penetrant for old, corroded fittings on general aviation birds?
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casey_henderson7mo ago
You used acetone on an airplane fuel line?
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emma3037mo ago
It's wild how many people will use a harsh chemical because it's handy, without checking if it's safe for the material. You see it all the time with cleaning products too, where something strong enough to eat through a finish gets used on a surface it'll ruin. It seems like a general habit of grabbing the quick fix without a second thought. That kind of shortcut can get really expensive, or worse, when you're dealing with something as critical as an aircraft part.
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gray_roberts6mo ago
What, you've never used nail polish remover for a little impromptu aircraft maintenance? Look, it was right there and the label said 'removes stuff'.
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