Had a right nav light that kept flickering intermittently. Checked all the obvious stuff, swapped the bulb, cleaned the ground, even ran a continuity test that passed. Turns out it was a pin in the D-sub connector that looked good but the crimp was barely hanging on. Took me from 2pm to 6pm to figure out something that literally took 2 minutes to fix. Anyone else waste a whole afternoon on a single bad connector?
I was over at a buddy's shop outside Atlanta last month helping him wire up a Garmin panel and he stopped me mid-crimp. Said look at the barrel after you squeeze it. I'd been using the wrong setting on my crimper the whole time. Turns out I was crushing the insulation instead of the metal part and it still worked fine for years. But one bump or vibration and those things can fail in flight. He showed me the proper way with a D-sub pin and I felt like an idiot. The insulation on the wire should still be visible after the crimp, not pushed back into the pin. How many of you actually check your crimps under a magnifier or just assume they're good?
I kept having this issue with a Garmin G5000 install where the displays would flicker randomly. Everyone on the line told me it was probably a grounding problem or bad coax. After 3 days of tearing my hair out I actually sat down and read the stupid installation manual cover to cover. Turns out I had the power supply wired in series instead of parallel like the spec called for. Fixed it in 20 minutes and never saw the flicker again. Has anyone else gotten burned by assuming you know the basics already?
I always trusted my Fluke 87V for continuity testing on the flight line. Turned out the leads had a crack near the probe tip, giving me intermittent false readings on a 737 brake wire bundle. Anyone else have a tool fail in a sneaky way like that?
Spent 6 hours tracing a intermittent fault in the weather radar system. Turned out to be a loose coax connector behind the radome that someone didn't torque right. Has anyone else found that those old ARINC 429 connectors just get flaky after 15 years?
I used to be that guy who kept all my test results on a spiral notebook. Scribbled down voltage readings and waveform notes while working on a King KX 155 nav com at my shop in Phoenix. Then about 3 months ago I had a customer come back complaining about an intermittent glitch in their Garmin G5. I dug through my notebook and the ink was smudged from a coffee spill, totally useless. Now I use a cheap tablet with a spreadsheet app and it saves everything to the cloud automatically. No more losing data or trying to read my own bad handwriting. Has anyone else dealt with a similar issue with paper records getting ruined or lost?
Honestly, I've been using the same analog multimeter for like 8 years at my shop in Chicago. Last month I finally swapped to a Fluke 87V after my old one started giving me weird readings on a 737 comm panel. The difference in troubleshooting was night and day. I caught a faulty comm antenna coupler in about 10 minutes that would've taken me an hour with the old meter. The digital readout is way more stable for those intermittent voltage drops. Has anyone else noticed that analog meters just can't keep up with modern LRU testing? What meter do you guys swear by for line work?
I was tracing an intermittent radio issue that had been bugging me for days. Turns out a chafed wire in the wing root was grounding out against a metal bracket every time the plane hit turbulence. I used a simple continuity test with a multimeter and some gentle wire wiggling to find it. Has anyone else dealt with hidden wire damage that only shows up under vibration?
Last Tuesday I was swapping out a Garmin GNS 530 in a 2004 King Air C90 at Grant County Airport. I thought I had the master switch off, but I bumped a live bus bar with my ring and blew the CESSATION CIRCUIT breaker. The smell of burnt solder filled the cabin and the pilot just stared at me from the door. Has anyone else shorted something dumb because of jewelry or a loose tool?
I always used the continuity test to check wires end to end. Got called out on a Gulfstream 450 after I traced a fault to a bad relay. Turned out the wire was fine but the pin had a hairline crack where it crimped into the connector. Continuity test passed because the crack closed up under probe pressure. A senior tech told me to wiggle the wire while testing. That simple trick caught three more bad pins on the same harness. Now I never trust a static continuity check on any connector. Anyone else have something dumb they did for years before someone corrected them?
I was swapping stories with a guy who's been doing avionics since the 80s, and he said something that stuck with me. He told me that modern test equipment is so quiet and clean that it hides a lot of the small glitches we used to catch with older gear. He showed me a waveform on his bench, and compared it to what my new digital analyzer showed, and there was a tiny spike he caught that mine missed completely. It hit me that all these fancy screens and auto-calibrations might be making me lazy about actually listening to the signals. He even said half the time he uses a basic screwdriver probe before busting out the expensive stuff. Now I'm wondering how often I'm missing stuff because I trust the box too much. Has anyone else noticed a big difference between old school troubleshooting and what we do today?
I was working on a Cessna 172 at a small FBO in Tucson about 2 years ago. This retired guy who used to do avionics for the Air Force walked over and watched me crimp a D-sub pin for a minute. He just said 'your die is set one notch too tight, you're crushing the barrel.' I checked my manual, he was right. Has anyone else had a random stranger spot a mistake you'd been making for months?
Picked up a fancy tablet from a vendor at a show in Atlanta last month, said it could pull data from any avionics bus. Got it back to the shop and it wouldn't even read the Honeywell system on a King Air, let alone the older Collins stuff. Anyone else get burned by gear that promises the world but delivers nothing?
Had a Comant CI 107 antenna that was intermittently grounding out on a Cessna 172 last week in Phoenix. Tried all the usual stuff like swapping trays and checking connectors, but none of it worked. Finally a senior tech told me to use a megger on the coax instead of a multimeter, and it showed the fault right away. Anyone else found a weird trick for tracking down antenna shorts?
The prints showed a pin 11 connection on the MFD but it was actually pin 22, and the senior tech just laughed and said welcome to Boeing field. Anyone else run into bad print revisions that waste your whole morning?
Been working on a 737-800 at the hangar in Memphis for the last month. Last week I kept chasing a bad ground on the VOR receiver. Turned out it was a pinched wire in the bundle near the avionics bay door. Fixed it on the third try Tuesday morning and the troubleshooting went smooth after that. Anyone else have those jobs where the simplest issue hides behind a bad install?
It took me about 4 years at the shop near Dallas, but I counted up my logbook entries and I just passed 1,000 harness repairs with zero callbacks. That includes a lot of fiddly work on old Gulfstream wiring where the diagrams were garbage. I never thought I'd keep track like that, but now I'm kind of wondering if anyone else bothers to count their successes or just moves on to the next job.
I used to just slap clip-on ferrites on every noisy wire I found, especially on the audio panel lines. Took me nearly a full day to dress and secure three bundles on a recent C90B. Then a senior guy showed me the EMC filters built right into the shielded connectors from Amphenol. No more fighting with loose ferrites that slide around during flight. Installation time dropped to maybe 2 hours for the same job. Has anyone else made the switch to those integrated types for interference on older airframes?
I spent 8 years at a shop in Tulsa using the same old Fluke meter for everything, so when my buddy swore by this cheap generic tester for checking harness continuity I laughed at him. After two weeks of chasing a ghost fault on a King Air, I grabbed it on a whim and the thing found a corroded pin inside ten minutes flat. Has anyone else had a cheap tool humiliate their expensive setup like that?
Last month I was chasing a Garmin 430 that kept losing power randomly. I spent a day swapping trays and connectors before I overheard a guy with 30 years in the Navy say "always check the ground strap before touching anything." Sure enough, the strap at the back of the rack had a hairline crack I couldn't see. Now I start every intermittent power issue by wiggling that ground. Anyone else have a simple fix that took way too long to learn?
I grabbed a Rigol DS1054Z secondhand for $250 and it's been spot-on for troubleshooting a nav antenna issue, but a buddy spent $200 on a no-name unit that drifted after two weeks - which side do you fall on for used vs. new avionics tools?
A retired avionics guy I met at a shop in Tucson told me never to buy the no-name BNC connectors off Amazon. I figured he was just being picky, so I grabbed a bag of 20 for $12 anyway. After two weeks, three of them had intermittent shorts when I tested with my multimeter - totally wasted my time troubleshooting. Had to pull all the wiring on a Cessna 172 tray and redo it with quality Amphenol parts. Any of you guys have a certain brand you stick with for RF connections?
Had a G1000 backup fail mid-flight over Wichita last Tuesday, traced it to a corroded pin in the PFD harness, and after 3 tries with the DMM I just hit it with contact cleaner and a gentle re-crimp, has anyone else had luck saving those pins instead of pulling the whole tray?
Honestly, I stopped by a small avionics shop off the I-10 last week and the lead tech had a rack full of HP 8903A audio analyzers and analog scopes. He told me digital all-in-one testers miss certain signal noise that analog catches for his older fleet. Has anyone else switched back to analog gear for specific bench work, or is this just old timer nostalgia?