c/avionics-technicians

That senior tech who told me to stop using dielectric grease on every connector I touch

After he pulled me aside in the hangar at DFW and showed me how it was actually trapping moisture on a Collins radio rack, I switched to just using it on the threads and haven't had a corrosion callback since - anyone else get humbled by a simple tip from the old guard?

Caught a bad crimp on a 737 nav antenna in Tucson last month, saved a 4 hour delay

I was doing a routine pitot static check on a 737-800 at Tucson International, and I noticed the crimp on one of the antenna coax cables looked a little off. Turned out the die on the crimper was slightly worn, so the connection wasn't fully seated. If I'd buttoned it up and rolled it out, that nav would've probably failed the first time they hit a storm. Has anyone else run into weird crimp failures with older tools?

I finally called out a guy for using a multimeter on live circuits without looking at the damn leads

Remember when we used to lug around a whole tool bag just for wire pinouts?

I was digging through my old toolbox today and found my 2005 vintage Fluke meter with the paper cheat sheet taped to the back. Back then, tracing a faulty coax line on a King Air meant flipping through three different binders for the pinout diagram. Now I just pull up the service manual on my tablet and have it done in 10 minutes flat. The switch from paper to digital really kicked in around 2010 when the company finally issued iPads for the hangar. It's convenient but I kind of miss having a dog-eared page to flip to, you know? Anyone else hang onto their old binders for nostalgia?

Picked a used Fluke over a new Klein for my tool bag

Had about $300 to spend and needed a decent multimeter for bench work. Went with a beat up Fluke 87V from a pawn shop near Phoenix instead of a brand new Klein MM700. Thing has been rock solid so far and the accuracy is way better than I expected. Has anyone else had luck buying used test gear from pawn shops?

Found out my tool pouch weighs 14 pounds fully loaded...

Weighed my everyday avionics pouch after a late shift last night and was shocked it's as heavy as a small bowling ball. Anyone else ever actually weigh their go-bag and reconsider what they carry?

Had to choose between a used Fluke 787 and a new Klein meter for the truck

Picked the Fluke for $300 off a retiring tech and it's been solid for two months now. The Klein was half the price new but I figured the clamp meter would last longer. Any of you guys go used on older Fluke gear over newer budget stuff with good results?

Why does nobody talk about static discharge on weather radars?

I was helping a buddy bench test a Collins WXR-2100 last Wednesday and noticed he skipped putting a ground strap on the antenna before powering up. Said he'd done it that way for years and never had a problem. But I've seen two units get cooked from ESD because the waveguide seal wasn't making proper contact. It only takes a 20 second walk across a carpeted hangar floor to build up enough charge to fry the receiver front end. Has anyone else had to replace a radar board just because someone forgot to ground the dish?

Finally switched from a Fluke 87 to a Brymen 869 and wow what a difference

I used the Fluke 87 for around 8 years on the bench and in the field. Last month I picked up a Brymen 869 after a buddy kept telling me to try it. The thing I noticed right away was the display on the Brymen is way easier to read in direct sunlight on the tarmac. Plus the peak hold actually catches those weird voltage spikes I was missing on the 87. Has anyone else made this swap or tried something different from the standard Fluke stuff?

Warning: watched a buddy skip bonding checks on a King Air yesterday

I was helping out at a small hangar in Wichita and noticed a guy I know just slapped a new antenna on without testing the bond. He said it's fine as long as the screws are tight, but I've seen that cause weird static on comms before. Has anyone else run into problems from skipping a bond check on a metal fuselage?

Walked into a maintenance hangar in Phoenix yesterday and spotted 3 planes with the same cracked connector housing on the JT8D engine harness

If you're working 737 classics with the old 8D connectors, double check the strain relief boots because that flight line had 3 birds sitting with arcing damage and I almost missed it on the first walkaround.

That cheap crimp tool from Amazon cost me a $600 fix after 2 weeks

I bought a $25 no-name crimper for D-sub pins and it mangled the contacts, which came loose on a Cessna 310 nav radio. Anyone else stick to the real AMP or Daniels tools even for small jobs?

That Tuesday in Newark where everything went sideways

Last summer I had a shift at Newark Liberty where three planes came in back to back with busted weather radars. First one was a 737 with a bad waveguide, second one was an Embraer with a corroded connector on the antenna, and the third one was a Gulfstream where someone had left a screw loose inside the radome. I spent eight hours straight on the tarmac and didn't even get lunch. Has anyone else had a day where the whole fleet seemed to fall apart at once?

Tried replacing an old Nav antenna bonding strap with a copper braid I found at a hardware store

Two weeks later I had a 50 foot deviation on a VOR check in Wichita and the avionics shop charged me $400 to put a proper strap on, has anyone else had luck with non aviation parts holding up in this trade?

Vent: Fried a $600 radar display panel with a static shock on the hangar floor

Last Tuesday in Phoenix, I was swapping out an old WX-1000 radar display and discharged static right into the connector. Whole thing went dark. Boss just shook his head and handed me the RMA form. Anyone else ever zapped something expensive by accident like that?

Pro tip: check your cooling fans BEFORE a long weekend trip

Last Friday I walked into the hangar for a quick preflight on a King Air 200 and noticed a weird smell right away. Opened up the avionics bay and one of the blower fans was completely locked up, plastic housing was starting to melt. Got lucky because I caught it before any real heat damage to the boxes. Had to order a replacement from a shop in Wichita, cost me about $180 and 3 days of waiting. Anyone else had a fan fail on a Garmin or Collins setup like that?

Cleaned a connector with isopropyl and it made things worse

Had a 737 pitot probe giving flaky readings last week. Hit it with 99% isopropyl like always, but the residue left a film that actually caused more noise on the line. Had to blow it out with compressed air then let it dry 20 minutes before it was clean. Anyone else seen isopropyl leave gunk behind on older connectors?

Finally stopped using those cheap D-sub pin crimpers from the tool truck

I used the same $40 crimper for about 2 years on DB9s and DB25s. Kept getting intermittent shorts on a navigation light controller install last month. Swapped to a proper Daniels crimper after a buddy at the hangar let me borrow his. Now I check each pin under a 10x loupe before I even seat it. Anyone else run into bad crimps on mil-spec connectors?

Saw a guy hook up a ground wire before the power lead on a Garmin G5 install yesterday

He got lucky nothing popped but I had to stop him and explain why that order matters for the internal voltage regulator. Anyone else run into this with the new glass panel retrofits?

Rant: That one inspector who told me I was 'too careful' with wiring harnesses

I still think about this guy from 2 years ago at a small hangar in Phoenix. He was an old FAA inspector checking my work on a Cessna 172. I had spent 4 hours routing a new harness, using tie wraps every 4 inches and protecting the bundle with proper sleeving. He looked at it for maybe 30 seconds and said 'you're spending way too much time on this, just zip tie it every foot and move on.' I was so frustrated because I wanted it to be clean and reliable, not just pass inspection. He actually told me that most avionics guys over-engineer everything because they're scared of failure. I remember thinking, isn't that the whole point of our job, to prevent failure? I asked him if he'd rather see a messy install that barely passes, and he just shrugged. Has anyone else dealt with an inspector or senior tech telling you to cut corners when you know better?

Skeptical of those all-in-one testers until my third A320 snag

I always thought the integrated card testers were a gimmick until last month when I had a weird intermittent comm fault on an A320 that took three shifts to trace. That little box pointed me to a bad LRU pin in 10 minutes. Anyone else had luck with those or am I just lucky so far?

Dropped $600 on a fancy spectrum analyzer last spring

Bought a used Anritsu off eBay thinking it'd save me hours on RF troubleshooting. Thing needed factory calibration that cost almost as much. Anyone else get burned on used test gear?

Ditched the digital oscilloscope for an old analog CRT

I was troubleshooting a weird intermittent glitch on a King Air autopilot last month, and everyone swore the digital scope was better. I went back to my 1990s Tektronix analog because I can actually see the waveform in real time without the buffer lag. Has anyone else found analog better for catching those split-second power drops?

Found a wiring discrepancy in a 737 that had been there for 8 years

I was doing a routine harness check on a 737-800 last Wednesday. Found a pin in the D-sub connector that was pushed back just enough to make intermittent contact. The weird part? I checked the logbook and that connector hadn't been touched since the original build in 2017. The aircraft had over 12,000 flight cycles with that bad pin just sitting there. No fault codes, no reported issues, nothing. I showed my lead and he said he'd seen stuff like that before on other frames. It got me thinking about how many other little gremlins are hiding in these harnesses that just never cause a big enough problem. Anyone else come across factory defects that went unnoticed for years?

TIL the hard way why you always check crimp connections twice

I was working a Cessna 172 panel upgrade in a hangar outside Omaha last Wednesday. Finished soldering a DB25 connector for the GPS, buttoned it up, and cycled the master only to get no GPS power. Spent 45 minutes tracing back before I found my ground pin wasn't fully seated. Just a hair loose, but it broke contact under vibration. Has anyone else had a tiny crimp issue eat up a whole afternoon?