c/aircraft-mechanics

26

olivia_carr7•19h ago

Finally figured out a trick for stripped screw holes on composite panels

I work at a regional hangar over in Jacksonville and kept stripping out those tiny screw holes on the composite panels near the wing root. Tried using oversized screws and they just made the crack worse. Then an old mechanic showed me to heat a small piece of nylon zip tie with a lighter and jam it into the hole before driving the screw. It held tight through the next two inspections and saved me from drilling out the whole panel. Has anyone else tried this or got a better fix for the same problem?

13

olivia_carr7•2d ago

Comparing 12 inch ratchets vs comfort grip ones on a 737 flap job this morning

I had to pull 16 screws out of a flap track fairing on a 737-800 today at the hangar in Memphis. Tried my old craftsman 12 inch ratchet with the bare metal handle on the first 8 and my hand was cramping up after the third one. Switched to my coworkers snap-on with the comfort grip for the other 8 and flew through them in half the time with zero hand pain. That rubber grip makes a huge difference when you're reaching into tight spots and need leverage. Anyone else swap out their old ratchets for the cushioned ones or am I just getting soft?

13

joseph932•2d ago

Found a trick for stubborn bleed screws on Cessna 172 brakes

After fighting a seized bleed screw on a 172 at KPDX last week for 20 minutes, I hit it with a heat gun on low for 30 seconds and it broke loose clean - has anyone else tried gentle heat on corroded brake parts instead of just wrenching harder?

23

taylorlewis•2d ago

Not a fan of torque wrenches for spark plugs anymore

Last month I was doing a cylinder change on a Continental O-470 at my hangar in Burbank. Pulled out my trusty Snap-on torque wrench, set it to 300 inch-pounds like the manual says. Got the plug in and torqued down. Few days later, engine started running rough on taxi. Pulled the plug and found a hairline crack right where the barrel meets the insulator. Took it to the shop foreman, and he said it happens all the time with torque wrenches on spark plugs. Said the preset kind can overshoot if you don't go slow. Now I just use a good old beam-style torque wrench for plugs, takes a couple seconds more but feels way safer. Has anyone else cracked a plug from a click-type wrench?

2

harper_wright•2d ago

Had a lead mechanic tear apart my safety wire technique back in 2012

I was working on a Cessna 172 at a small shop near Phoenix and this old guy watched me wire a prop and said 'looks like a drunk spider did that'. He made me redo it 4 times until the twists were perfectly tight and even. Has anyone else had a senior mechanic call them out on something basic early in their career?

8

casey393•6d ago

Switched from a standard torque wrench to a digital one on C-130s last month

I used to second-guess my click-type wrench on those engine mount bolts until I borrowed a Snap-On digital torque wrench from a buddy at Dyess and caught three bolts that were 12 ft-lbs under, has anyone else had better luck with digital for critical torque values?

17

victor_carr25•7d ago

Talking to a 30 year A&P guy at Oshkosh last summer got me thinking about older repair methods

He said something about how we lean too hard on digital troubleshooting now and miss the simple stuff like listening to the engine for clues. Has anyone else found that older mechanics had tricks that just work better sometimes?

0

hall.nora•9d ago

The before and after on my torque wrench calibration was wild

Got my old Snap-On torque wrench back from calibration last week and the difference is crazy. Before it was reading 180 ft-lbs when I set it to 200 on a test rig. That means I've been under torquing main bearing bolts on 737 engines for probably 2 years since my last check. The calibration shop told me the internal spring had drifted almost 12 percent. Has anyone else had a big surprise when they finally got their tools checked?

22

graceprice•9d ago

Shoutout to the guy who showed me the zip tie trick on landing gear brake lines

I spent 45 minutes struggling with a loose brake line on a Cessna 172 last Tuesday before another mechanic walked over and showed me how a single zip tie through the inspection panel holds it steady while you torque the fitting, and now I use it every time.

16

tarajenkins•11d ago

Tried a new sealant on a Cessna fuel tank, got a nasty surprise

I decided to try PR-1440 instead of the usual PR-1422 on a Cessna 172 wing fuel tank last month. I figured it would cure faster and get me out of the hangar quicker. Well, it cured in about 4 hours like they said, but when I did the pressure test the next day, I had three pinhole leaks I hadn't seen before. Turns out the PR-1440 doesn't flow as well into tight seams when it's warm out, and I was working in a 90 degree hangar in Phoenix. I had to scrape all that new sealant out and redo it with the old stuff, which cost me an extra 6 hours of labor. Has anyone else had problems with fast-cure sealants in hot weather like that?

24

amybarnes•15d ago

Dropped a 10mm socket inside a PT6 engine and had to fish it out with a magnet on a stick

I was working on a PT6 at the hangar in Tulsa last Tuesday, trying to torque a fuel nozzle line. The socket slipped right off the extension and plopped into the compressor section, I just stared at it for a solid 10 seconds. Had to grab a flexible magnet probe and spend 20 minutes wiggling it past the stator vanes without scratching anything. My lead mechanic came over and just laughed, said I wasn't the first to do it. Anyone else have a tool go where it definitely shouldn't have?

20

rosek44•15d ago

Pro tip: Stop using the wrong grease on landing gear bolts

I spent two years packing landing gear bolts with standard wheel bearing grease because that's what the old guys in my hangar did. Last month a regional airline inspector flagged my work during a spot check and told me to look at the spec sheet. Turns out I needed a specific MIL-PRF-81322 grease for those pins, and my cheap stuff was causing premature wear on the bushings. Has anyone else been using the wrong lube without realizing it?

16

rosek44•17d ago

Dropped $600 on a cordless rivet gun and now I get why people hate pneumatic

Bought the Makita XVR02Z last month for a wing skin job and it cut my time by half. Anyone else ditch their air tools for battery stuff?

26

karen_hart•17d ago

Finally caught why my torque wrench kept failing calibration

I was storing it at max setting for 7 years. Tech at Duncan Aviation in Lincoln tipped me off during a audit last Tuesday. Anyone else make that dumb mistake?

15

juliahall•17d ago

Warning: that cheap inspection camera from harbor freight gave me bad info on a control cable

I was checking a rudder cable on a Cessna 172 last weekend and used one of those little $30 borescopes. Picture looked clear so I thought the cable was fine. Then my lead mechanic ran his actual ATS scope on it and we found internal corrosion in three spots the cheap one completely missed. Almost signed off a cable that was one hard deflection away from snapping. Anybody else had a cheap tool give them bad data?

5

benreed•18d ago

I don't get the hype about the "finger-tight then a quarter turn" rule for oil filter installation.

Had a Continental IO-470 last month that kept leaking until I just cranked it down hand-tight with a wrench. Took me two oil changes and a ruined shirt to figure out that spec doesn't work for every gasket. Anybody else just go by feel instead?

2

wendy_park76•20d ago

Fell for that "high torque" electric ratchet hype and wasted $180 on a tool that barely breaks lug nuts loose

Bought that cheap brand off Amazon thinking I'd save time on panel work but it died on the third bolt, had to finish the job with my old manual ratchet; anyone else get burned by those flashy online deals?

25

taylor.paige•21d ago

Old timer at the hangar told me to back off torque on oil filter housings

At a regional line station in Boise last spring, a retired Delta mechanic named Walt told me to only hand-tighten those big Continental housings with a palm on the wrench. He said a torque wrench would strip the threads every time, and sure enough I've seen three guys blow out the same part using specs from the manual since then. Has anyone else had an old hand give you advice that flew in the face of the official procedure but ended up saving you a headache?

14

hugo_jones•22d ago

That choice between safety wire pliers and the old needle nose method on a 737 engine

Last Tuesday I was doing a safety wire job on a Pratt & Whitney engine, and I had to decide if I should grab the expensive safety wire pliers from the drawer or just use my trusty needle nose pliers like I've done for years. I went with the needle nose because I was in a hurry, and honestly I regret it. My fingers got super cramped after the first few holes, and the tension wasn't consistent across all the bolts. Has anyone else found that the pliers are actually worth the hassle for big jobs like this?

24

ericb66•22d ago

Had a week where every bolt just fought me back

Started Monday with a stubborn nut on an engine cowling that took 45 minutes to break free, then Wednesday I spent two hours chasing a lock washer that dropped into a hidden nook under the APU. By Friday, I was replacing a fuel line and the new part was 3/16 inch too short, so I had to bend the bracket myself. Worst part was the crew chief just laughed and said 'some weeks are like that.' Has anyone else had a run of bad luck that made you question your whole approach?

1

luna589•24d ago

Found out rivet guns have a lifespan limit from a Navy buddy

I was chatting with a guy who worked on P-3 Orions for 15 years, and he told me rivet guns lose power after about 500,000 cycles. I always thought they just kept going until they broke. Anyone else ever track how many cycles your main gun has?

21

smith.ray•24d ago

Heard a lead inspector say torque seals are just for show, got me second guessing half my paperwork

I was helping a guy with a 737 flap track last Wednesday and he casually mentioned that torque seals don't prove anything since you can just twist them on after, and now I'm wondering how many of my own sign-offs are actually worth the paper they're written on, anyone else ever run into this mindset on the floor?

10

abby_robinson58•25d ago

Found a torque wrench from 1987 in a hangar closet, still within spec

I was cleaning out an old storage closet at the regional airport I contract at, and stuffed behind a bunch of rags was a torque wrench from 1987. The calibration sticker said it was last certified in 1992. I figured I'd test it for laughs on a known fastener, and it clicked right at 100 inch-pounds, dead on. The guy who left it probably retired and forgot about it. I see new guys all the time arguing torque specs by feel instead of using a proper wrench. How many of you have found random tools that still work perfectly?

11

evab52•25d ago

Why does nobody mention cleaning ultrasonic parts with a coffee filter trick?

A buddy I used to work with at Delta showed me this last week. He said to use a standard coffee filter over your beaker spout when pouring out used ultrasonic solution, and it catches all those tiny metal shavings and grit before they clog your sink. Have you ever tried something simple like that that just made your day easier on the hangar floor?

25

blairj55•25d ago

That guy who swore torque wrenches were a scam

Had a dude at the hangar last Tuesday tell me he's been torquing spark plugs by feel for 30 years and said my fancy Snap-on wrench was a waste of $400. He even showed me his stripped spark plug hole on a Lycoming like it was a badge of honor. I just nodded and kept walking but that conversation stuck with me because he was dead serious. Anyone else run into mechanics who refuse to use torque specs?