c/avionics-technicians

Got burned by a cheap coil tester, lost half a day on a 737

Bought one of those generic $35 coil testers off Amazon and it read everything as good, even a mag that was clearly arcing out... cost me 4 hours chasing a ghost before I used the shop's old one and found it in 10 minutes. Anyone else had a cheap tester lead them down the wrong path?

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hugotaylor•9d ago

The 40 dollar multimeter probe that fixed my intermittent radio gremlin

Had a King radio in a 172 that kept dropping the mic audio only when the plane got warm. Replaced the mic jack twice, cleaned the push to talk, even swapped the headset. Still did it. Finally checked the probe pins on my fluke, they had a hairline crack I could only see with a magnifier. New probes, 40 bucks, and the exact same resistance test showed the fault in 2 minutes. Has anyone else chased a phantom for days only to find the test gear was the weak link?

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williamhenderson•12d ago

Swapped old D-sub pins for solder cup, 3 weeks later no regrets

I had a faulty attitude indicator that kept getting signal drops, and I had to choose between re-crimping the D-sub pins or going with a solder cup connector. I picked solder cup because the old pins had green crust that even contact cleaner wouldn't fully fix. The job took me close to 7 hours over two nights in our maintenance trailer, mostly because I kept second guessing my solder temps and had to redo two joints that looked cold. Once I dialed in the iron to around 700 degrees, the solder flowed smooth and I got a solid pull test on every wire. It's been two weeks and no flicker on the display, so I'm happy with the call. One thing I noticed, solder cup connectors take up more room than the old ones, so my backshell didn't fit right and I had to shave a bit of strain relief. Has anyone else dealt with clearance issues after switching connector types?

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wren_mitchell•21d ago

Took me 4 years to realize my continuity tester was lying to me

I always trusted the beep on my Fluke for continuity checks, but last Tuesday in the hangar I traced a fault that tested fine with it and found a cracked solder joint under magnification. Turns out the tester only confirms a path exists, not that it's solid under vibration or load, and I'd been chasing ghosts on older harnesses with it. Anyone else ever get burned by trusting a basic continuity check over actually pulling tension on the wires?

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david703•22d ago

Old wire diagrams beat the new digital ones, change my mind

I spent 10 years chasing faults with laptop schematics, then last month I dug out a 1982 paper diagram for a 737 pitot static issue. It showed the routing and ground points in one page that took me three screens to piece together digitally. Anyone else feel like the PDFs lost the big picture somewhere along the way?

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olivia_lopez98•23d ago

Old school multimeter vs my new scope, am I crazy for going back?

So I've been torn on this for a few weeks now. I did a full avionics bench upgrade back in March, dropped $800 on a fancy digital scope with all the protocol decoding bells and whistles. It's great for tracing a flaky ARINC 429 bus on a 737 pack controller, saved me hours of poking around. But for simple stuff like checking a pitot heat element or verifying a relay coil's resistance, I keep reaching for my beat-up Fluke 87 from 2006. The scope is overkill, the menus lag, and sometimes I just want a dumb number I can trust. But my younger coworker says I'm stuck in the past, that the scope's waveform view catches intermittent stuff a meter will never see. I get that, but when a pilot calls from Phoenix complaining about a flickering display, I'm not dragging a scope up a ladder. Anyone else split their testing gear this way, or is it all-in on one platform for you guys?

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wendy_lee48•24d ago

Saw the inside of a lightning strike hit panel at PDX and now I double check every ground strap

After a strike on a 737 back in March tore a path through the composite skin and fried three LRUs, I started pulling every bonding strap on preflight and have caught two loose ones since, anyone else do more than just a visual tug since seeing one up close?

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josephbailey•25d ago

Pin map threw a fit after a lightning strike near the ramp

Last Tuesday in Phoenix, a storm rolled through and took out three of our pin maps on the same tail. The lightning didn't hit us directly, but the surge still fried the boards. I spent four hours swapping units and re-running the loop test, then found the real issue was a ground bond on the aft belly skin. Has anyone else dealt with surge damage that didn't leave any burn marks?

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keith274•25d ago

Pin pull test on a DMC tool caught two bad pins in 20 minutes at KAFB

I was chasing an intermittent fault on a KC-135 pitot static line last month, the kind that only shows up when the bird shakes on taxi. I had already swapped the transducer and the connector, but the problem kept coming back. A senior guy told me to do a pull test on the pins with a proper DMC tool, not just the manual tug. Turns out two pins in the cannon plug had barely enough retention to pass the initial check, but they would lose contact with any vibration. Replaced those pins and reseated the insert, and the fault disappeared completely. Cost me about 20 minutes versus the 4 hours I was budgeting for a full harness chase. Has anyone else run into pins that pass a visual check but fail a pull test on older connectors?

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angela_morgan•25d ago

Lost my cup holder to a static discharge incident at PDX

Last month I was swapping out an antenna coupler on a CRJ at Portland. Ground crew was late with the static grounding wand so I figured I'd grab my coffee from the cart before I climbed up. Big mistake. Reached over the nav compartment and this static snap jumped from my hand to the rack, dead short on a connector. My coffee cup flew off the cart, landed in a bin of spare washers. 30 minutes re-testing everything because that zap could've fried a module. Now I keep my drink in the truck until the wand's attached, no exceptions. Does anyone else treat static like a personal grudge or am I just paranoid?

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wade_kelly77•28d ago

Hit 5,000 flight hours last Thursday and it hit different than I expected

I always thought hitting that milestone would feel like a big deal, but what actually convinced me it mattered was a 26-year-old panel I was troubleshooting that had every damn wire zip tied so perfect, it made me realize experience shows up in the small habits, not the number itself, so what milestone snuck up on you guys?

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craig.viola•1mo ago

Skeptical about those cheap TDR meters, now I use one every week

I mean, I always figured the $80 time domain reflectometers were just toys for hobby guys. Back in March we had a flickering issue on a CRJ that took us two days to track down manually, and my lead finally insisted we try one. It found a water damaged segment behind a panel in under ten minutes, which honestly blew my mind. Now we keep the cheap one in our toolbox at the MRO in Atlanta and it's paid for itself maybe five times over. Has anyone else had a budget tool that ended up being a daily driver for you?

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brooket43•1mo ago

That $40 harness tester from Harbor Freight surprised me big time

I've always laughed at their cheap tools, but last week I had a stubborn intermittent fault on a King radio install and that simple continuity tester with the LED buzz actually caught a broken pin 12 wire I'd rechecked twice with my multimeter. Wired it inline and cycled the harness while holding the connector, the light flickered right at the bend near the firewall. For under 50 bucks it's now living in my bag next to my good Fluke, I guess sometimes the cheap stuff earns its spot. Anyone else found random budget gear that out- performs the expensive kind for specific jobs?

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sean_barnes24•1mo ago

Chasing a ghost in the hangar at 3 AM changed my whole test approach

Last month I spent 11 hours on a King Air in Wichita chasing a intermittent transponder fault that only showed up after the plane sat cold overnight. Turned out a loose coax connector behind the rack had enough play to break contact at exactly -2 degrees, my new habit now is to wiggle every connector before I even power up the rig. Anyone else found weird temperature related gremlins that only bite at night or is it just my luck?

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the_miles•1mo ago

Cockpit display flicker drove me nuts on a 1990 Beechcraft in Tulsa last Tuesday

We had a King KX-155 and the screen was ghosting after 20 minutes of power, like a bad capacitor in an old TV. I reseated the backplane connector twice and reflowed a solder joint on the power supply board, thinking that was it. Then I noticed the dimmer knob was halfway cracked inside, so I swapped in a used one from the parts bin and it's been solid for three days now. Anyone else chase a simple knob issue for hours before realizing the obvious? It's funny how the old stuff always hides the easy fix.

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maxl93•1mo ago

That $220 wire tracer was a total waste on this old Hawker

Picked up one of those fancy digital wire tracers from the tool truck last month to chase a short in a 1980s Hawker 800. Spent a whole afternoon in the hangar in Tulsa fighting with it, the thing kept picking up noise from every other bundle in the panel. Finally borrowed my buddy's old analog toner and found the break in ten minutes flat. The digital unit just couldnt handle the corroded connectors and the shielding in that ancient bird. I could have spent that $220 on beer and been more productive honestly. Anyone else had bad luck with new test gear on legacy airframes or is it just me?

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brooke_jones•1mo ago

TIL my old coax crimper was causing intermittent signal loss on a Cessna 172

Had a talk with a senior tech out of Oshkosh last week. He looked at my work and asked about my crimper. I showed him the cheap one I've had for years. He said 'that tool is why you've been chasing ghosts.' Turns out the die was worn just enough to make connections that looked good but tested bad. He let me borrow his Snap-on crimper and re-did three connectors. All passed with 0.5 dB loss. My old ones were all over the map. Made me wonder how many other guys are out there fighting bad crimpers without knowing it. Has anyone else had a simple tool cause a headache like that?

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brooke_jones•1mo ago

Tried a Fox vs Garmin transponder install side by side last month

Had to swap out two G1000 installs on Cessna 172s last month. One got a Fox 780, the other a Garmin GTX 345R. The Fox took me maybe 45 minutes less on wiring alone since it had simpler pinouts. But the Garmin's altitude encoder data was way cleaner on the first power-up - no tweaking needed. Is the extra wiring time worth the reliability on the Garmin for most of you guys?

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fisher.thomas•1mo ago

Had a DME alt fail during a run-up in Denver last Tuesday

I was doing a quick run-up on a King Air and the alternator just dropped offline. No warning, no flicker, just a red light. Turned out the brush block was worn down to almost nothing after only 600 hours since last overhaul. Swapped it with a spare I had in the truck and it came right back. Anyone else seen these DME alts wear out way faster than the OEM ones?

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ivan_harris•1mo ago

Hot take: A multimeter with a backlight beats a cheap one every time when you're working in a dark hangar at 2 AM

Last week I was troubleshooting a bad ground on a King Air up in Seattle. Grabbed my old no-name meter from the bottom of my box and spent 20 minutes trying to read the display with my phone flashlight. Finally borrowed the lead tech's Fluke with the backlight. Found the problem in under 5 minutes. The difference was night and day. Why do we put up with gear that makes the job harder just to save 40 bucks? Anyone else got a tool upgrade that saved them a headache?

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nina_taylor•1mo ago

Was skeptical about those expensive torque wrenches for avionics work, but after snapping a connector on a $2k board I changed my mind real quick.

I always used the cheap harbor freight ones thinking torque is torque, right? Then I was tightening a D-sub connector on a control board and the torque wrench didn't click at the right setting. Snapped the plastic shell clean off. Boss had to order a $2,100 replacement board. That was 3 months ago, now I only use CDI or Snap-On for critical stuff. Has anyone else had a budget tool fail at the worst possible moment?

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hannah_wells•1mo ago

A three hour wire chase on a King Air that should have taken thirty minutes

Last Tuesday I had a King Air 200 come in with a right generator that wouldn't come online. I checked the breaker, the switch contacts, and the voltage regulator all within the first hour. Nothing worked so I started ringing out the harness from the generator field back to the panel. It took me almost three hours before I realized a pin had pushed back in a cannon plug behind the copilot's seat, it was just barely making contact. Anyone else ever spend way too long hunting a simple connection issue?

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jessem59•1mo ago

Dropped $1800 on a Fluke 1587 FC last spring and it paid for itself in one week tracking down a ghost fault in a G1000 harness.

Turns out that intermittent no-start was a fretted pin deep in the wing root connector that no multimeter could catch until I ran the insulation test, has anyone else had a bad pin cause a head-scratcher like that?

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kai_burns73•1mo ago

Just realized my soldering iron tip was the problem all along

I spent like 3 months fighting with cold joints on wire repairs at work. Replaced my whole setup, tried different fluxes, even blamed the board itself. Then last week I swapped out the old tip on my Hakko for a new one and it was night and day. The old tip was oxidized way worse than I thought after about 200 hours of use. Has anyone else had a tool issue that was hiding in plain sight like that?

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hugotaylor•1mo ago

That old crimp tool I thought was junk turned out to be a lifesaver

I found a beat up DMC crimper at a garage sale in Tucson last year for $10. Figured it was just some junk but the jaws looked good so I grabbed it. Took it to the shop last week to test on some D-sub pins and it crimps tighter than my new one. Guess the old USA made stuff really is better sometimes. Anybody else got an old tool that surprised them?

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