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Used to chase every intermittent fault with a Fluke 87 in one hand, now I just yank the whole LRU and bench test it at KDEN
Burned 3 days on a flap asymmetry squawk in 2019 that turned out to be a chafed bundle behind the aft pressure bulkhead, and now I don't even crack the manual until the box is on the bench with a breakout box plugged in, so I gotta ask, does anyone still troubleshoot on-wing or is it just me that gave up?
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masonbell18d ago
Yanking the box every time works until the fault is something a 20 minute wiggle test on wing would find, and now you've got an MEL you didn't need plus a removal and reinstall eating your shift. Half the intermittent stuff I've chased traces back to connectors and loom routing that show up way better under vibration and heat than sitting cold on a bench. Benching first just moves the guessing to a different room, it doesn't get rid of it.
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