c/aircraft-mechanics

Guys please stop using zip ties on fuel line clamps

Watched a guy in the hangar last Thursday secure a fuel return hose with a zip tie because he was out of proper clamps. Said it was fine for a quick fix. That hose sees 50-60 psi and constant vibration. Ive seen those things snap after a few cycles in the engine bay. How hard is it to just walk to the supply room and grab the right clamp? Has anyone else had to undo someone else's zip tie job on a critical line?

Got chewed out by a senior mechanic over my torque wrench technique

I always used the click-style torque wrench by pulling fast until it clicked, but a guy with 30 years at Delta told me that was wrong for certain bolts. He said aluminum threads on older Boeings can strip if you don't slow down near the end. Has anyone else had to unlearn a habit after getting called out on it?

The wear difference on a landing gear actuator I saw over just 6 months

I was doing a routine check on a 737-800 last week and had to pull the landing gear actuator for a seal replacement. What got me was comparing it to the same part from another plane that came in 6 months ago. The older one had been serviced every 400 cycles and looked almost new inside. The one I just pulled had gone maybe 700 cycles without a look and the piston rod was scored bad, like someone ran sandpaper down it. Turns out the company switched to a cheaper hydraulic fluid that didn't have the same anti-wear additives. The before and after was night and day. Has anyone else seen a big change in part life after a fluid or lubricant swap?

Switched from safety wire to those locking cotter pins on landing gear bolts

Used to spend 20 minutes per wheel assembly twisting safety wire on Cessna 172s, always worried about getting the tension right. A buddy at the shop in Tulsa showed me those pre-formed cotter pins that snap into place last month. They hold just as well and cut my time down to maybe 5 minutes a wheel. Has anyone else tried them on larger jets or am I the only one swapping old habits?

Old timer at the hangar told me to stop using anti-seize on spark plugs

I had this old mechanic, probably 30 years in the biz, tell me that anti-seize on spark plugs was a bad idea. I thought he was crazy because every car guy I knew swore by it. But he said on aircraft engines the torque readings get thrown off and you can end up over tightening or under tightening. I ignored him for the first few months and just kept doing what I was doing. Then I had a plug seize up on a Continental O-470 and it took me two hours to get it out without damaging the threads. Now I just install them dry with a torque wrench like he said. Has anyone else run into this debate on radial engines or is it just a GA thing?

Had to choose between a digital torque wrench and a beam style for engine work

I was doing a cylinder overhaul on a Cessna 172 last month and needed a new torque wrench. My old beam style was getting sloppy, so I had to pick between a digital Snap-on or a classic Proto beam style. I went with the Proto because I figured I trust a needle and scale more than batteries on a night shift. The digital would have been nice for the beep and the memory, but I just didn't want to worry about it dying mid job. So far the beam style has been dead on, and I don't have to remember to turn it off. Has anyone else had a digital wrench fail on them at a bad time?

PSA: The days of finding paper manuals in the hangar are long gone

I was cleaning out my toolbox last week and found my old A&P textbook from 2008. Crazy how thick that thing was compared to the iPad I use now. Last month at the shop in Atlanta, a kid asked me what a "service bulletin binder" was. I remember hauling a three-inch stack of 43.13 revisions around for years. Now if the wifi drops for five minutes near the hangar, nobody can pull up a torque value. Makes you wonder, did we trade reliability for convenience, or am I just getting old?

Old timer told me to stop torquing spark plugs to spec in Florida humidity...he was right

I've been an A&P for about 4 years now and I always followed the manual to the letter for spark plug torque values. This guy named Rick who's been turning wrenches since the 80s told me I was gonna strip threads in the Florida humidity if I kept doing that. I told him he was wrong and kept doing it my way. Sure enough I pulled a plug on a Cessna 172 last month and found the threads in the cylinder head starting to gall up. Rick's advice was to back off the torque by about 15% in humid coastal areas because the aluminum expands differently. Now I keep a separate torque setting for planes based in beach cities like Daytona. Has anyone else found regional climate factors messing with standard torque specs?

I finally stopped using safety wire pliers on cotter pins

Everyone swears by the wire twisters for cotter pins on landing gear, but I had one snag and break on a King Air last Tuesday. I went back to doing them by hand with a pair of duckbills and got it done in half the time without any drama. Am I the only one who thinks those pliers are overkill for small pins?

Debate: Should we trust the torque specs or the 'feel' method? An old inspector vs. a young mechanic.

A few weeks back I was torquing some fasteners on a wing panel. An older inspector walked by, told me to stop using the torque wrench for everything. Said I was going to strip something from being too rigid with the numbers. Said I needed to develop 'the feel' for when it's tight enough. I followed his advice on one bolt. It came loose during a taxi test. Now I am wondering if that was bad advice or if I just did it wrong. Has anyone else had a situation where a veteran's tip backfired, or is torque by feel a real skill worth learning?

Had a pilot ask me to "just fix it quick" before his flight last month in Phoenix...

Tried chasing a vibration on a Cessna 172 for two days and it was a loose cowling fastener

I spent last Thursday and Friday chasing this weird vibration in the cabin of a 172 that only showed up at cruise power. Checked the prop balance, looked at the engine mounts, even pulled the spinner. Turned out to be one loose cowling screw on the lower left side that let a little panel flap at speed. Anybody else waste a bunch of time on something stupid simple like that?

The torque wrench that lied to me for 6 months

I was torquing down some landing gear bolts on a Cessna 172 at our hangar in Tucson and felt something off. Ran the wrench against our calibrated test rig and it was reading 20% low the whole time. Turns out I never stored it in its case and the mechanism drifted pretty bad. Anybody else skip the annual torque wrench check and get bit later?

That one line from a retired AA mechanic in Miami still sticks with me

About 4 years ago I was helping a guy pull an engine off a 737 at a shop in Miami. He was probably 70 years old, retired American Airlines, just helping out for fun. We were trying to get this stubborn bolt loose and I was about to grab the impact gun. He just put his hand on my shoulder and said 'slow down, feel the bolt first.' I thought he was nuts. But he showed me how to put a wrench on it and tap it with a brass hammer in a rhythm. That bolt came right off. It took maybe 2 extra minutes but we didn't strip anything. I think about that whenever I get in a hurry. Has anyone else had an old timer teach you something that seemed dumb until you tried it?

Everybody raves about ultrasonic cleaners for fuel nozzles

I used one for 2 years on Pratt nozzles and saw zero improvement in flow bench numbers after. Switched to a simple hand soak in a specific solvent blend my old mentor swore by and got a 12% flow increase on the first set. Any of you other guys seen cleaner results going old school instead of fancy gear?

That cheap digital torque wrench set me back $400 on a turbine job

Picked up a Harbor Freight digital torque wrench for like $80 thinking it was a steal. Used it on a PT6 turbine reassembly and it wasn't even close to calibrated - snapped a bolt on the diffuser case. Had to pull the whole thing apart and order a replacement from Pratt, cost me $400 in parts and a full Saturday. Anyone else get burned by cheap torque tools before?

That Thursday in July when three planes came in with the exact same bad fuel control unit

We had twelve mechanics working double shifts for two days straight trying to track down a phantom issue on a 737, turned out all three had the same batch of FCUs from the overhaul shop with a bad seal, and the senior lead finally just walked out to the hangar floor at 2am and said everybody go home this is a vendor problem.

Learned the hard way that buying a $60 torque wrench from harbor freight is a gamble

Had to redo a spark plug replacement on a Cessna 172 after my cheap wrench clicked at 20 instead of 25 ft-lbs, cost me an extra 3 hours and a new gasket - anyone else had a budget tool fail at the worst time?

the thing i was dead wrong about was composite repairs on aluminum airframes

Been turning wrenches since 1999 and I spent years thinking fiberglass patches on metal skins was just a bandaid. Then about 5 years ago I had an MD-80 with a belly skin that looked like swiss cheese from corrosion in the galley area. My lead handed me a 3M scotchbrite pad and some epoxy and I was ready to fight him over it. That repair held for 4 more years until we retired the plane. What made me go from hater to believer? Actually watching a bonded doubler distribute load across a crack on a test coupon. Has anyone else here had to eat crow about a repair method they swore was garbage?

Rant: The Before and After of Our Shop's Tool Inventory System

I swear, I walked into our hangar at Midway Airport last month and it was like a whole DIFFERENT place. The tool crib used to be a total disaster zone with wrenches and sockets scattered everywhere. But after our lead mechanic, Dave, spent 3 weekends organizing it with a shadow board setup, the difference is NIGHT and day. He color coded everything by size and even added a sign out sheet for the torque wrenches. Now I can grab a 3/8 ratchet in under 30 seconds instead of digging through a bin for 5 minutes. It's saved me SO much time during the morning rush before we start inspections. Has anyone else's shop made a big change like that recently? How long did it take for your crew to get used to it?

Can we talk about how long it took me to realize my torque wrench was clicking because I had it set to inch-pounds instead of foot-pounds?

I spent two years torquing landing gear bolts way under spec because I never checked the unit marking on the dial, and it took a senior mechanic catching me on a 727 wheel hub to point out my mistake so now I always double check before I start cranking.

Got a weird vibration report on a Cessna 172 last Tuesday, traced it to a worn pulley bracket.

The bracket looked fine until I wiggled it and saw a hairline crack. Anyone else had a sneaky bracket failure like that?

I finally tried that ultrasonic cleaner for carbon-clogged fuel nozzles

My lead at the Denver hangar swore by his Crest unit, and after seeing it clear a set of nozzles from a Cessna 172 in 20 minutes, I'm sold. Anyone have a good solvent mix they prefer for turbine parts?

Appreciation post: I fought against digital torque wrenches for years, but a job in Miami broke me

Honestly, I used to swear by my clicker wrenches, thinking the digital ones were just expensive toys for new guys. Then I got a contract doing heavy checks on a fleet of 737s where every single critical bolt needed a logged reading, and my old method was costing me hours. Ngl, I bought a digital wrench after three days of that misery and it cut my time per engine by like 40%. Has anyone else been forced to switch tools on a specific job and actually been glad about it later?

Just got my A&P ticket after three years of night classes

I picked up my certificate from the FSDO office this morning. The guy behind the counter just slid it across the desk like it was a parking ticket, but man, it felt huge. I've been working as an uncertified mechanic at a small cargo outfit in Bakersfield, doing the grunt work while taking classes. The last oral and practical was on hydraulic systems, and I must have drawn that Cessna 208 brake schematic ten times before I walked in. My boss already moved me onto the line for a King Air 200 annual next week. For anyone who did the night school route, how long did it take you to stop feeling like you were going to get quizzed on something?