c/aircraft-mechanics

PSA: Always double-check the torque on stabilizer trim jackscrews

Last month at a shop in Charlotte I had a Baron come in for a routine inspection. Found the jackscrew nut had backed off by almost a full thread. Previous guy mustve rushed it. Caught it before it got serious but man that couldve been bad on a go-around. Has anyone else found loose hardware on older Pipers?

Spent 4 hours chasing a ghost in a Cessna 172 fuel system yesterday

Had a 172 come in with a rough running engine, pilot said it was missing at full throttle. I checked spark plugs, mag timing, even pulled the carb. Nothing obvious. Turned out to be a tiny piece of debris in the fuel strainer bowl, barely bigger than a grain of sand. It was floating around and only blocked flow under high fuel demand. Cleaned it out, test ran it, and it purred like a kitten. My lead mechanic said I should have checked the strainer first, but I learned my lesson. Anyone else ever get fooled by a simple clog like that?

Heard a lead mechanic say torque wrenches are 'good enough' without calibration

I overheard this guy in the break room last Thursday talking about how he only sends his torque wrenches in every two years. Said a few foot pounds off doesn't matter for most bolts. Am I the only one who thinks that's asking for a fastener failure down the line?

Had a talk with a new hire in Denver that changed how I look at torque wrenches

He was fresh out of A&P school and showed me how he calibrates his own Snapon at home with a cheap beam style. Made me realize I've been trusting the shop's calibration tags for 8 years without ever double checking. Any of you guys do your own torque wrench checks?

That trick with dental picks for removing old gaskets actually works

I was fighting a stubborn gasket on a Cessna 172 oil filter adapter for like 20 minutes last week. Ended up grabbing a set of dental picks from my tool box that I bought for 8 bucks at the hardware store. Used the curved one to gently pry under the gasket edge without gouging the mating surface. Then I used some gasket remover spray let it sit for 5 minutes and it came off in one piece. Saved me from having to scrape and risk damaging the flange. Anybody else got cheap tool tricks they use around the hangar?

That $400 torque wrench I bought off a guy at the airport - total scam

I gave some dude 400 bucks cash for a supposed Snap-on digital torque wrench he claimed fell off a truck. Got back to the hangar and it was off by 18 foot-pounds on the low end, basically useless. Anyone else get burned buying tools from sketchy sources at the FBO?

Appreciation post: ultrasonic cleaner vs doing fuel nozzles by hand

I spend last Saturday fighting with a set of CFM56 fuel nozzles on a 737. First one took me 45 minutes scrubbing with solvent and a brush. Then I borrowed the shop's ultrasonic cleaner for the rest. 15 minutes in the tank and they came out spotless. No caked on carbon, no clogged orifices. The difference in time and quality is insane. Has anyone else made the switch and never looked back?

Vent: That fancy ultrasonic parts cleaner I bought was a total waste of money

I dropped $600 on one of those big ultrasonic cleaners for engine parts, thinking it'd save me hours. After 3 tries, it still left carbon buildup on a set of cylinders that took me 20 minutes with a brush and solvent. Anyone else find these things useless for anything but small fuel injectors?

That time an MD-80 engine change taught me to double check EVERY torque value

I was out on the line at O'Hare last winter doing a QEC swap on a Pratt 5000 series and one of the senior mechanics pulled me aside after I torqued the B-nuts. He showed me how a .5 inch extension in the wrong spot can throw the whole sequence off by 15-20% on a critical clamp. Anyone else ever get burned by trusting the book data without checking the tool setup first?

Snapped a torque wrench on a 737 flap track at O'Hare last Tuesday

I was doing the final torque on a flap track bolt on a 737 and my Craftsman torque wrench just snapped right at the head. That thing was my go-to for like 8 years, never had an issue. Switched over to a Snap-on after that and the difference in feel is night and day. Any of you guys have a tool brand fail on you in the middle of a job?

Found corrosion hiding under a perfectly clean panel yesterday

I was doing a routine C-check on a 737 at the hangar in Tulsa and pulled a belly panel that looked spotless from the outside. Underneath, there was a patch of intergranular corrosion the size of my palm that had been eating through the stringer for months. Anyone else run into hidden damage that looked fine until you pulled the fasteners?

Unpopular opinion: I actually prefer using a manual torque wrench over the digital ones

I tried a digital torque wrench on a Pratt engine last month in Houston and the reading bounced around on two different fasteners. Learned I trust the click of a beam-style wrench more than a screen that can glitch on a hot tarmac. Anyone else ditch the fancy stuff after a bad experience?

Walked through a hangar at the local airport here in Dayton last weekend...

Some shop had an old DC-3 sitting in the corner that they're slowly restoring, and I noticed all the control cables were routed through these ancient brass pulleys instead of modern bearings. The guy working on it said they keep the original style parts because the whole system has a certain amount of 'give' that newer setups don't have. Has anyone else run into a situation where older hardware actually performed better than what you'd replace it with?

PSA: Hit my 10,000th torque wrench calibration check and it was on a C-130 rudder bolt

I work at a base in Oklahoma and we do monthly torque checks on every wrench in the hangar. Last Wednesday I pulled out my old clicker and the reading was 8 foot-pounds off from the standard. Turns out I had been under-torquing rudder bolts on a C-130 for about 60 flights before the night shift caught it on a routine inspection. Nobody got hurt but it scared me enough to double-check every calibration log now. Has anyone else had a close call like this from a simple tool drift?

Serious question - why does everyone act like torque wrenches are the only way to fly? Found a detail that changed my mind

Was reading through the FAA AC 43.13-1B the other night, and it straight up says you can use a beam type or even a good ol dial indicator for a lot of critical stuff if you know what you're doing. The torque wrench crowd makes it sound like you'll kill someone if you don't click it at exactly 160 inch pounds. I've been using a beam style on engine mounts for 6 years without a single issue. Who else has gotten away with something besides the standard clicker?

Boeing vs Airbus on engine swaps - picked Boeing and got burned

Had to decide between a 737NG and an A320 for a quick engine change last month at DFW. Went with the 737 because I know them better, but the fan blade retention pins were seized worse than I've ever seen. Took an extra 4 hours to break them free with heat and Kroil. Has anyone else run into this on the CFM56 or did I just get unlucky?

Hit 10,000 flight hours as a mechanic last week and it hit different

I was just checking my logbook after signing off a 737 landing gear swap and realized I crossed 10,000 flight hours. That's like 416 days of work in the air or something. It made me think about all the little cracks I caught that could have been big problems. Anyone else stop and look back at their hours total and get surprised by how far you've come?

Vent: Chased a fuel leak for 6 hours on a Cessna 172, turned out to be a loose clamp

That guy who said to never trust a torque wrench you dropped

My lead mechanic Bob told me if a torque wrench hits concrete it's junk forever. I figured he was being dramatic until I dropped my Snap-on three feet onto the hangar floor last month and it was off by 15 inch-pounds on the next fastener check. Has anyone else had a torque wrench survive a drop or am I out $200 for a replacement?

The day I found a paperclip holding a landing gear wire

I was doing a routine inspection on a Cessna 172 last Wednesday and popped open a panel near the wheel well. There it was, a bent paperclip jammed in where a cotter pin should have been, holding a brake line clamp. The owner swore he'd never seen it before, but the rust on that paperclip said otherwise. How do you even miss that during a preflight? Has anyone else run into weird stuff left behind by previous mechanics?

The 5 minute trick that saved me 3 hours on a bleed check

That advice about torque wrenches from a senior mechanic saved me last week

Old Mike at the hangar told me always to store my torque wrench at the lowest setting when I started six months ago. I thought he was being picky until I dropped $400 on a Snap-on and left it at 200 inch-pounds for a week. Last Tuesday I was torquing cylinder base nuts on a Lycoming and it clicked way too early. Checked it against the shop's calibration rig and it was off by 20 percent. So yeah, listen to the graybeards about the little stuff. Anyone else ruin a torque wrench by not setting it down right?

Can we talk about using a torque wrench on spark plugs in a GA engine

I was doing a routine plug change on a Lycoming last Tuesday and had a choice to make. Either use the beam style torque wrench my old mentor swore by or go with the click type I picked up at a pawn shop for $40. I went with the click wrench because it felt more precise, but I double checked every single plug with the beam wrench anyway. Turns out the click wrench was off by about 8 foot pounds on the low end after the first few cycles. That mismatch could have stripped a plug thread or left one loose enough to back out over time. Now I keep both wrenches in my box and use the beam style as a sanity check on anything critical. Has anyone else run into a click wrench that drifted out of spec without you knowing?

Took my rig to a shop in Detroit and spotted something weird on their hangar floor

They had this old hydraulic mule parked next to a 737 and oil was pooling under it like crazy. Has anyone else dealt with those old mules leaking way worse than the newer electric ones?

Swapped standard torque wrenches for a click-type on hydraulic line jobs and it saved my butt

Honestly, I was using beam-style wrenches for 5 years until I over-torqued a B-nut on a 737 hydraulic line last month. Switched to a snap-on click-type and the difference in accuracy is night and day. Has anyone else had issues with beam-style slipping on high-pressure lines?