c/aircraft-mechanics

Rant: the engineer who blamed me for his own mistake

Last month I was doing a preflight check on a Cessna 172 at JFK. Found a loose spark plug wire. Simple fix. The lead engineer came over, looked at it, said I must have knocked it loose during my inspection. He told me to sign off on it like nothing happened. I refused. Later found out he forgot to torque it after the last engine run. Has anyone else dealt with engineers passing the buck like that?

Am I the only one who keeps seeing people torque lug nuts dry on regional jets?

I was helping a buddy swap a wheel on a CRJ200 last Tuesday and noticed the last guy never put any anti-seize on the studs. Then I looked at the manual and it clearly says to use it. We had to beat that wheel off with a sledge. Why is skipping that step so common? I've seen it three times now in two different hangars. Has anyone else run into this or am I just unlucky?

I was dead wrong about torque wrenches on composite panels

Been doing sheet metal work for 7 years at a regional line in Spokane. Always figured you could just snug those composite panels by feel like the old aluminum ones. Then last month an A&P showed me the actual torque spec on a CRJ door panel was 12 inch-pounds. I overtorqued a test piece by about 40 and got visible crazing around the fastener holes. Now I check the book every time even on stuff that seems simple. Anyone else have a torque surprise that changed how you work?

Just spent 6 hours chasing a faulty temperature reading on the 737

A gauge kept showing a hot start. Pulled the thermocouple, tested it. Fine. Checked all the wiring. Clean. Even swapped the ECU. Nothing. Turned out it was a loose ground wire behind the panel. Hidden under a zip tie. 6 hours for a 5 minute fix. Anybody else had a simple ground wire eat up a whole shift?

Was skeptical about ultrasonic cleaning for carburetors until I tried it. Anyone else have a tool they doubted then came around on?

My torque wrench lied to me on a 737 rudder cable

Last Tuesday I was tensioning a rudder cable on a 737 and my click-type torque wrench didn't click until I was way past spec. Ended up snapping a washer off the turnbuckle. Turns out the internal spring had rusted from moisture sitting in my box over the winter. Got a digital one from the shop now and I check it against the calibration log every 30 days. Any of y'all had a torque tool fail on you like that?

Nearly torched a hangar last Tuesday with a rag in a bucket

Pro tip: double check the part number before you drill out a broken bolt

I spent 4 hours on a Cessna 172 flap actuator last Tuesday before realizing I had the wrong replacement bracket because I misread the IPC, has anyone else wasted a whole shift on a simple parts mismatch?

Old timer told me to stop chasing torque specs on landing gear bolts. He was right.

I was torquing down some main gear bolts on a 737 last month and this guy named Jerry walked over. He told me to forget the spec and just go by feel on the lock nuts. I argued with him for five minutes until my lead came over and backed Jerry up. Turns out the manual doesn't account for old dried grease in the threads, and I was way overtightening for three years. Anyone else have a graybeard save them from stripping something expensive?

Debate: chalking tires on a Cessna 172 vs. chocking them on a Gulfstream

Back in 2018 at my first job at a small FBO in Wichita, we always chalked the mains on everything from Pipers to Citations. Now I'm at a corporate hangar in New Jersey and the lead mechanic insists on chocking the nose wheel and the mains on the Gulfstream G450. It's way more stable but also slower to set up. He says the old way risks the nose gear slipping if the brake releases. Which method do you guys trust more for bigger jets, and has anyone actually seen a plane roll with just mains chalked?

PSA: The before and after on my tool cart after 2 years of neglect was embarrassing

I finally cleaned out my Snap-on tool cart last Saturday after putting it off since I started at the Gulfstream hangar in 2022. There was a clump of safety wire, three dried up pens, and a 10mm socket I swore I lost hiding under a pile of old work orders. I spent about 45 minutes with Simple Green and a rag, and now I actually find stuff on the first try instead of digging for 5 minutes. Anyone else let their cart get that bad before finally dealing with it?

I used to swear by torque wrenches for everything, but now I just use the beam style for most jobs

I used to think click-type torque wrenches were the only way to go, especially after I spent $150 on a fancy digital one. But after 6 months wrenching on engines at a small shop in Tucson, I kept having to recalibrate the click type because it kept losing accuracy. Then my buddy showed me his beam-style torque wrench, the old school one with the needle. He was tightening cylinder head bolts on a Lycoming engine and it held steady every time. I tried it on a set of wing bolts last Tuesday and it was way more consistent than my digital one on the low torque settings. Idk, maybe it's just me, but I think the beam style is simpler and less prone to messing up when you're in a tight spot. Has anyone else had issues with click-type wrenches drifting out of spec?

Last week I got roasted for saying safety wire isn't always the answer

I was working on a Cessna 172's oil filter at KSDL and a guy walks over from the next hangar, starts giving me crap for using a safety clip instead of twisting wire. I told him look, for a quick oil change on a trainer that's gonna get changed again in 50 hours, the clip works fine and saves me 10 minutes. He just shook his head and walked off. Any of you guys use clips on low-critical stuff or am I the only one?

Just read something about the 737 rudder system that made me rethink a training point

I was going through some old NTSB reports and saw the detail about United Flight 585. The investigation found the rudder actuator could move to its full travel in under a second with just a small input. I always thought those systems were slower to react. Has anyone else had to adjust their mental model on hydraulic control surfaces after digging into those older incidents?

Ran into a retired FedEx line guy at the Memphis airport bar last night

He said he saw more engine failures from people rushing the post-runup checks than from actual mechanical issues. He told me about a specific MD-11 at his old base that had a compressor stall because someone skipped the bleed air valve check. Has anyone else had a mentor point out a simple step you were taking for granted?

Had a weird hydraulic line leak on a King Air in Billings last month that turned out to be a bad O-ring from a new seal kit.

Just dropped $200 on a new torque wrench that started clicking inconsistently after a week.

The calibration is already off by 15 foot-pounds, which I found out during a gear retraction test. What's a brand you actually trust for precision tools that last?

Had a chat with a 20-year A&P at the FBO coffee pot that changed how I see old tech manuals...

He was flipping through a greasy, coffee-stained binder for a 1978 Cessna 172. I joked about it being a museum piece. He just looked at me and said, 'Kid, this thing has the original mechanic's notes in the margin from '82. That guy's dead. His hands touched this page to fix the exact same plane I'm fixing. You don't get that from a PDF.' It hit different... made me see the shop library as a kind of time capsule, not just old paper. Anyone else have an old manual or logbook entry that told a story?

Spent 3 days chasing a phantom hydraulic leak on a 737 classic, turned out to be a $2 O-ring from 1992.

Finally got that stubborn flap actuator seal to seat on a 172

It was weeping fluid for months and the old seal just wouldn't sit flush in the groove. I warmed the new one in hot water for 10 minutes and it popped right in. Anyone have a better trick for those stiff O-rings?

Question about that 'just use a bigger hammer' advice on a Cessna 172

My buddy Jake at the hangar in Tucson always joked that any stuck bolt just needed a bigger hammer. Last month on a 172's landing gear pivot, I actually tried it after three hours of penetrating oil. Snapped the bolt head clean off, and we had to drill it out for two more days. Anyone got a better trick for seized hardware on older airframes, or is Jake just cursed?

Shoutout to the old-timer at the Oshkosh airshow who told me 'a clean logbook is a mechanic's best friend'

He said he once spent 12 hours tracing a phantom oil leak on a Cessna 172 because he didn't check the last guy's messy, incomplete log entry first, and that really made me rethink how I review paperwork before I even touch a panel.

PSA: Had a torque wrench calibration sticker expire mid-job on a Cessna 172

I was finishing up the annual on a 172 last Tuesday, torquing the cylinder base nuts to 300 inch-pounds. Right as I got to the last one, I noticed the calibration sticker had expired two days prior. I stopped and borrowed a good wrench from the shop next door, but it got me thinking. Some guys say you should stop the job right then and send the tool out, no matter what. Others say if the wrench feels fine and you're almost done, finishing is okay as long you get it calibrated after. What's the real rule in your shop when this happens? I don't want to be the guy who cuts a corner.

PSA: My $80 magnetic socket holder was a total waste of money on the line

I bought a GearWrench 20 piece set thinking it would keep my sockets organized during a heavy check on a 737. The magnets just weren't strong enough, and the whole thing tipped over when I bumped it, scattering sockets into a panel. I had to spend an extra hour doing an FOD check. Anyone have a better tool organization method for a busy hangar floor?

The trick with the zip tie on a stripped screw head

I was doing a gear retraction check on a King Air last Thursday and the access panel screw was totally rounded out. My lead said to order a new panel, which would take two days. Instead, I cut a small piece of a heavy duty zip tie, jammed it into the screw head with a flathead, and pushed down hard while turning. It grabbed just enough to break it loose. Saved a huge delay and a $300 part. Anyone got a better method for those Phillips heads that turn into circles?