c/aircraft-mechanics

Lost $40 on a cheap borescope that died in a week

Picked up a no-name borescope off Amazon to check a cylinder wall on a Cessna 172, and the LED flickered out after 6 inspections. The images got so dark I couldnt tell scoring from shadows, and the return window closed. Anyone else had luck with a specific budget model that actually holds up on the line?

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johnfoster•2d ago

Got tired of chasing intermittent faults on a 737, so I built a cheap wiggle-test rig out of a 2x4 and some hood springs

After 3 days of tracing an MEL'd flap position indicator on a -800, I bolted a paint stick to a drill and strapped it to the harness, it shook the whole bundle at 20 Hz and the break showed up in 2 minutes, anyone else rig up janky vibration setups like this or do you just rely on the old grab-and-tug method?

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coleman.jade•3d ago

Torque wrench calibration saved me from a nasty surprise

I had a 737 wheel assembly come back with a hub bolt that wasn't torquing right last month in Tampa. My digital torque wrench was reading 220 foot-pounds but the bolt was barely at 190 when I checked it with a manual beam style. Turns out the calibration sticker was outdated by 14 months and nobody noticed because we never logged the usage hours. I sent it out for calibration and now I keep a simple log book on the cart, every 90 days or whenever it drops. Anyone else run into silent calibration drift on digitals that seem fine until you cross check them without a checklist?

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schmidt.grant•4d ago

Union shop vs non union, heard a foreman say something that got me thinking

Was doing a line check on a 737 last Tuesday and overheard the lead tell a new hire that union guys only care about the clock and non union guys cut corners to save money. Both sides of that are way too simple. I've worked 9 years non union in Tulsa and saw plenty of guys rush a brake job to beat the schedule. But I also know union guys in Seattle who chain smoke in the break room while a tire pressure check waits. Is it really about the card, or just the culture at each specific shop? Curious if anyone else has seen both sides and noticed a real pattern.

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jakewhite•8d ago

Blind landing light swap, I chose the wrong side first

Last week I had to replace a landing light on a 737 in Memphis and the access panel was stuck. I had two options: pull the whole assembly from the top or go blind from below with just my left arm. I picked the blind route because it was quicker, but I dropped the new bulb and it shattered on the tarmac. Took me 20 minutes to fish out the glass bits and admit I should have just loosened the four top bolts from the start. Anybody else ever pick the sketchy shortcut and immediately regret it?

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lewis.diana•9d ago

That 20-year veteran's comment about my borescope habit stuck with me

Last week at the hangar in Tulsa, an old A&P named Ray watched me do a routine borescope check on an RB211 fan blade. He said, "You're looking for cracks, but you should be looking for the story behind them." Then he showed me a blade with a tiny indication that traced back to a bad compressor wash two cycles prior. I always treated borescope checks like a checklist, but now I look at the whole history. Has anyone else had a senior guy reframe how you approach inspections? What's the best trick you picked up from an old timer?

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jordan653•9d ago

Removed a cylinder with a broken ring compressor in Mesa, took 4 hours of swearing

The cheaper compressor bent on the second ring and I had to rig it with a hose clamp and prayer. Got it seated but it scratched the piston skirt, so now I'm ordering a proper $80 one. Anyone else had a field fix that turned into a parts nightmare?

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stone.evan•10d ago

Borescope camera on a tablet beats my old laptop setup every time

Used to drag a clunky laptop with a USB scope into the hangar at KPAE, but since I switched to a wireless tablet borescope last month, I can actually see the turbine blades live while I maneuver the probe, has anyone else made that jump and noticed a big difference in how quick you find cracks?

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carr.willow•10d ago

Hit 5,000 flight hours and finally noticed my torque wrench habits were off

Logging exactly 5,000 hours last month made me realize my left wrist was pulling 12 ft-lbs low on flap tracks every single time, so I switched to a dial style for a week and the readings came out perfect, has anyone else caught a physical tick like that from repetitive turns?

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fiona502•11d ago

Switched from lithium grease to Aeroshell 33 after 12 years, here's what changed

I always thought lithium grease was fine for flap tracks until I watched an old timer strip a 737 actuator and show me the dried up mess inside, so I switched to Aeroshell 33 last month and now I'm wondering if I should redo the whole fleet, has anyone else made that swap and seen a difference in wear patterns?

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nathan_patel•12d ago

PSA: That new apprentice who 'knows everything' from YouTube? Watch your back.

Had a kid in Dayton last month swear a torque stripe was just paint, so he skipped it on a main gearbox bolt. Two days later the line chief found it finger tight during a walkaround, and he tried to blame the last shift. Anyone else run into this YouTube-certified attitude before they get someone hurt?

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matthewperry•12d ago

Why does my torque wrench click when the bolt is barely snug?

I've been seeing this a lot on line maintenance lately. Young guys coming in, they use a cheap clicker wrench on a dry bolt, and it clicks at like 10 foot pounds when it should be 25. They think it's done. But the threads are binding, not the fastener seating. I had a case last month at O'Hare where a cowling fastener came loose because of this. Check the threads, use a little lube if the manual says so, and always do a final pull with a beam wrench if something feels off. Anyone else deal with this, or is it just the sets I'm getting?

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alexlewis•13d ago

Second shift mechanic said torque wrenches are a suggestion, I walked out

Guy I work with at the hangar in Wichita has 14 years on me. Last Tuesday he was doing wheel bearings on a 737 without even checking the manual. Told me he's never snapped a bolt so why bother. I told the lead and he just laughed. This is how we end up with runway incidents. Am I being dramatic or should I have filed a report with the FAA?

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nathan_patel•16d ago

Apprentice asked why I still use dial indicators over digital

Heard a kid at the IA renewal class in Phoenix say digital calipers make dials obsolete, but on a wet ramp with greasy fingers, that needle is still easier to read without wiping the screen. Has anyone else seen digital tools fail right when you need a quick runout check?

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rowank69•17d ago

Snap-on torque wrench calibration cost me, now I check before I trust it

I spent $180 getting my old Snap-on click-type torque wrench calibrated at a shop in Phoenix last month. Turned out it was reading about 8 foot-pounds high at the 40-60 range, which is a big deal on engine hardware. I had been torquing cylinder head bolts with that thing for over a year before I decided to check it. That error could have caused a major come-back, so the money was worth it, but it burned me on the time I lost trusting it. Now I keep a log of when each wrench gets tested and I rotate between two cheaper digitals for most jobs. Does anyone else send their torque tools out on a regular schedule, or do you just wait until something feels off?

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piper175•18d ago

DAE miss the days when we overhauled carburetors instead of chasing ECU gremlins?

I spent last Tuesday troubleshooting a fuel control issue on a 2018 Cessna 172 and after 4 hours of swapping sensors I found out it was just a bad ground. Back in the 90s working on old Pipers you could pop a carb apart in 20 minutes and see the problem clear as day. Anybody else feel like the new glass cockpits take all the fun out of diagnosing hard starts?

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barbara399•19d ago

That week in Newark where every single torque wrench was out of calibration

It was a Tuesday morning at the Newark hangar and I went to torque a main wheel nut on a 737 and it clicked at 50 ft-lbs less than it should have. We pulled all 4 torque wrenches from the tool room and every single one failed the calibration test, all reading way off. Maintenance control had to rush us a fresh set from JFK and we lost almost 3 hours on the line. Has anyone else had a whole batch of tools go bad at once like that?

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ellis.charles•20d ago

Old timer at a hangar in Savannah showed me something I still think about

He walked up during my first engine change on a 727, pointed at a worn torque wrench and said 'son, trust the click not your arm.' Been thinking about that ever since. Any other old-school tips you guys still use?

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hunt.rowan•20d ago

Seeing too many guys skip torque seal on critical bolts

I was walking through the hangar at KGPI last week and noticed three different planes where someone forgot to put torque seal on landing gear bolts. That stuff is cheap insurance for a quick visual check during walkarounds. Anyone else run into inspectors flagging missing torque seal on routine work?

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noahcampbell•21d ago

Tired of seeing people skip the torque wrench on spark plugs in GA engines

I was helping a buddy at KSQL last month swap plugs on a Cessna 172 and he just grabbed his ratchet and started tightening by feel. I told him to stop and use the torque wrench. He said he's done it this way for 10 years with no issues. But I've seen two separate planes come into our shop with stripped threads in the cylinder head from over-tightening, and one of them cost the owner $800 to fix. Why risk damaging a $2000 cylinder just to save 3 minutes?

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ninas70•21d ago

Tried to replace a fuel nozzle O-ring on an A321 at 6 AM and dropped the damn thing into the tank

Had to fish it out with a borescope and a wire coat hanger in front of the lead mechanic, has anyone else had to MacGyver something out of a fuel cell before?

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the_sarah•25d ago

TIL the hard way not to buy aircraft parts on eBay

I snagged what looked like a deal on a magneto for $120 and after 3 hours of install it failed during engine run-up. Has anyone else lost money buying parts from shady sellers on there?

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kim.wren•25d ago

Found a cracked engine mount on a Cessna 172 last Tuesday

I was doing a routine annual inspection on a 1978 172 at KPAO when I noticed a hairline crack along the forward engine mount tube near the number two cylinder. It was barely visible under the paint and grime, maybe 1.5 inches long. I wiped it down with MEK and hit it with a magnifying glass to confirm. Nobody else caught it during the last two annuals. Has anyone else found hidden cracks in tubular mounts that showed up late like this?

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leo238•28d ago

Shoutout to my old lead mechanic for the torque check tip

I was cleaning out my toolbox last week and found a note from a guy named Hank who trained me six years ago at a shop in Phoenix. He wrote "check your torque before you walk away" on a sticky note and it was stuck to my torque wrench. I remember one day we were working on a 737 flap actuator and I nearly forgot to re-torque a bolt after a final check. He caught it and said the same thing with a grin. That little habit has saved me from redoing jobs more times than I can count. Anyone else got a random piece of advice from an old timer that stuck with you?

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joelsanchez•29d ago

Had a close call at LAX last Tuesday that changed how I torque bolts

I was working a line maintenance shift at LAX last week and one of the guys showed me a wheel bolt that had backed out halfway after a quick turnaround. We found it during a walkaround and it could have been a real mess if it went unnoticed. Ever since that day I've been double checking the torque on every single wheel bolt I touch, even if it adds 5 minutes to the job. The whole thing made me realize how easy it is to get sloppy when you're in a hurry or tired. Does anyone else have a routine they follow to stay sharp on the little things like this?

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