Chat with a retired mechanic at the air show made me rethink my whole approach

I was at the Oshkosh show and got talking to this guy who worked on DC-3s back in the 70s. He said, 'We didn't have fancy manuals, we had to listen to the airplane and feel what was wrong.' I've been so focused on the computer diag for everything lately, maybe I'm missing the basics. How do you guys balance the old-school feel with the new tech?

3 comments

3 Comments

the_michael1mo ago

...and that's a fair point from @hayes.tara about the FADEC systems, but I'd push back a tiny bit on the idea that "listening" is just for lawnmowers. The old-timer at Oshkosh wasn't wrong, he was just talking about a different era of maintenance where your hands and ears were your primary tools. Those DC-3 mechanics didn't have the luxury of sensor data, so they developed a feel that's still valid today (even if it's now a supplement, not the main show). The trick is knowing when the gut feeling should override the computer and when the computer is catching what a human ear can't hear, and that's something you only get by respecting both.

hayes.tara3mo ago

That old timer probably forgot about the planes that crashed because someone "felt" the engine was fine. My uncle worked at a regional airline in the 80s and they had a string of write-offs from missed corrosion that a modern scan would catch in a second. Listening for a rough idle is fine for a lawnmower, but a modern FADEC system has a hundred sensors for a reason. Relying on gut feeling over data is how you get a cascading failure at 35,000 feet.

faithg263mo ago

Yeah, I saw something like that at my last shop. We had a veteran mechanic swear a turbine blade vibration was "normal character" based on sound, but the new kid insisted on a borescope. Turns out there was a tiny crack starting that the audio couldn't pick up. The data from the sensors gave us the hard proof we needed to ground it. It's that mix of experience and tech that catches problems now.