c/aircraft-mechanics

I've been using the wrong solvent on composite panels for years

A new guy at the hangar in Tampa asked why I was using acetone, and showed me the manual that specifically says not to. It was for a Cessna 172R composite wingtip repair. What's the best safe cleaner you all use for that kind of work?

Bought a cheap $80 torque wrench for a Cessna 172 annual, it failed calibration after three uses.

Just realized the difference between using a 3/8 drive and a 1/4 drive on those tiny avionics bay fasteners.

My lead at the Denver hangar called my torque sequence 'good enough' and it bugged me for weeks

We were doing a 500-hour inspection on a King Air 200, and I was torquing the cylinder base nuts. My lead, Carl, watched me and just said 'that's good enough' in a way that made it clear it wasn't. I realized I was rushing the criss-cross pattern. Now I physically point at each nut with my wrench and count out loud to make sure I don't skip. Anyone else have a simple trick to keep from zoning out during repetitive torques?

Spent 6 hours chasing a phantom hydraulic leak on a Cessna 172. Turned out to be a cracked O-ring on the reservoir cap vent line.

I saw a 737's landing gear up close at the Museum of Flight in Seattle and it clicked

I was at the Museum of Flight in Seattle last weekend, just walking around. I stopped by the 727 they have cut open, and I was looking at the main landing gear assembly. I realized I've only ever seen that stuff from a distance on the ramp, or in pieces in the hangar. Seeing it all connected, clean, and static, I could actually trace every hydraulic line and linkage. It made the whole retraction sequence in the manual make way more sense. Has anyone else had a basic system just 'snap into place' after seeing it displayed somewhere like that?

Finally bought a good inspection camera for those tight spots

Dropped about $350 on a Milwaukee M12 inspection camera last month. Used it yesterday to check for corrosion inside a wing spar on a Cessna 172 without pulling half the interior. Saved me at least two hours of guesswork and disassembly. Anyone have a favorite brand for these, or a trick for keeping the lens clean in greasy areas?

PSA: The aviation museum in Dayton had a sign that made me laugh

I was at the National Museum of the USAF last weekend and stopped by the restoration hangar. They have a big sign on the door that says, 'If you can read this, you are not working.' It was right next to a B-17 they're fixing up. I stood there for a good five minutes just watching them fit a new panel. Made me think of all the times I've been deep in a wheel well and someone asks if I'm busy. Anyone else run into funny shop signs or museum displays that hit a little too close to home?

A senior mechanic in Phoenix called me out on my torque wrench technique

I was tightening a cylinder base nut on a Lycoming O-360 and thought my method was fine. He watched for a minute and said, 'Kid, you're pulling at an angle. You're off by at least 10 foot-pounds.' He showed me how to keep the handle perfectly level and re-check with a calibrated wrench. I've been double-checking my pull angle on every critical bolt since that day. Anyone else have a simple technique they had to unlearn?

Remember when you could just trust a parts manual? I lost a whole day and $80 on a bogus torque spec from an old Cessna 172 IPC.

Had a real 'oh crap' moment with a stripped bolt on a Cessna 172 fuel drain valve last week

Logged my 10,000th hour on the CRJ-700 this morning

The logbook entry just hit different, you know? It's wild how much of that time was spent on just the landing gear rigging checks. What's the one airframe you've spent the most time on, and what's the job you've done on it a hundred times?

I finally heard a pilot say 'just get it done' to a new guy about a deferred write-up

It was for a minor avionics light, but the tone made my skin crawl. How do you handle that pressure when you know signing it off isn't right? I told the kid to grab the MEL manual and we'd do it by the book.

Can we talk about the new composite patch adhesive from AeroBond that sets in 20 minutes?

I was chatting with a retired FAA inspector at the diner near the hangar yesterday, and he flat out said, 'That fast-cure stuff is great until you realize it's masking a bad surface prep job,' which hit different because I just rushed a repair on a Cessna 172 flap using it last week.

Had to pick between a full engine teardown or just the accessory gearbox on a King Air last week.

The pilot reported a rough mag check and some metal in the oil filter. I was looking at pulling the whole thing for a major, but the borescope showed clean cylinders. I went with just dropping the gearbox... found a cracked idler gear housing. Saved the owner about $15k in labor and parts. Has anyone else had a King Air try to trick them into a bigger job than it needed?

Bought a cheap torque wrench from Harbor Freight for a flap motor job, it was off by 15 foot pounds on the high end. Cost me a whole afternoon of rework.

Why does nobody talk about the right way to check a tire for a slow leak?

I keep seeing guys at my hangar just spray soapy water on a tire and call it a day if they don't see bubbles right away. In my experience, that's a good way to miss a leak that shows up only when the tire is under full load. I had a Cessna 172 last month that kept losing a few PSI a week. We soaped it cold, nothing. I finally put it on the jack, loaded the strut with weight to simulate sitting on the ground, and inflated to the full spec pressure. Found a tiny seep right at the bead seat after about ten minutes. If we'd just sent it, that tire would have been a problem on a hot day. It's a five minute extra step that matters. Has anyone else run into this, or am I just being too careful?

Serious question, a pilot friend said we mechanics are too focused on the book and not the plane.

We were having a beer after a long day on a King Air 350, and he said, 'You guys follow the manual so close you forget to listen to what the metal is telling you.' It hit different because he wasn't wrong, I've seen guys replace a perfectly good part just because the manual said to check it. Where do you draw the line between following procedures and using your own gut feel?

PSA: The time a duck tried to build a nest in a 737's engine intake in Boise

We were doing a pre-flight walkaround on a clear morning last spring. I looked into the left engine intake and saw a full mallard duck, just sitting there on a pile of twigs and grass. The bird looked at me, I looked at it, and my captain just started laughing. We had to call the wildlife guys, who gently shooed it out with a long pole. Has anyone else had a wild animal try to claim a plane as its new home?

Switched to that new non-chlorinated brake cleaner on a Cessna 172's landing gear, and it left a weird white film.

Turns out it reacted with some old grease the standard stuff would've just cut through. Anyone have a go-to cleaner for grimy, mixed-contamination jobs?

TIL a pilot at the FBO in Daytona called my torque wrench a 'clicky toy'

He was waiting on his pre-flight and watched me setting the torque on a prop bolt, then said 'You guys and your clicky toys, just get it tight.' I had to explain that 250 inch-pounds isn't a feeling, it's a spec. How do you handle people who don't get the precision side of the job?

Got a stubborn Cessna 172 nose gear pin out with a zip tie and some heat

Last Tuesday, I was doing a pre-buy inspection on a 172 and the nose gear safety pin was totally seized. The owner said it hadn't been pulled in years. I tried the usual penetrant and pliers, but it wouldn't budge. I ended up wrapping a heavy-duty zip tie around the pin's ring for better grip, then carefully warmed the gear leg around the hole with a heat gun for about 30 seconds. It popped right out with a solid tug. I know it sounds a bit redneck, but it saved me from having to drill it out. Has anyone else found a good trick for stuck pins that doesn't risk damaging the fitting?

Appreciation post: an old timer at the hangar showed me a trick with a safety wire

I was fighting with a tricky bolt on a Cessna 172's exhaust bracket last week, my pliers kept slipping. This guy, Frank, who's been wrenching since the 70s, walks over without a word. He takes my wire, twists it once around his finger, then feeds it through. He said, 'Kid, let the tool do the work, you're just guiding it.' That simple change in how I held things made the whole job click. Anyone have other little tricks for tight spots like that?

Serious question, has anyone else had a torque wrench calibration go bad right in the middle of a job?

I was working a night shift in Anchorage on a 737's main landing gear, torquing a critical bolt to 450 foot pounds. My click-type wrench clicked, but the bolt felt loose. I checked with a beam wrench from the tool crib, and it showed I was 50 foot pounds under. The calibration on my primary wrench had drifted without any warning. I had to stop everything, tag out the bad tool, and re-torque every bolt on that assembly with the backup. It added three hours to the job. How do you guys handle tool trust when the calibration sticker is current but the tool is lying?

Finally got my A&P license after failing the oral on fuel systems twice

Took the oral exam three times total. Failed the first two on fuel system questions. Spent about $400 extra on retest fees and study guides I didn't need. The third time, I just focused on the manuals we already had in the shop. Passed it easy. Should have just trusted the books from the start. Anyone else have a section that tripped them up for a while?