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Had a stubborn autopilot altitude hold fault on a King Air this morning
It was hunting up and down about 50 feet. I spent an hour checking the usual suspects before I found a tiny crack in the static line port on the ADC. Replaced the O-ring and it sealed right up. Anyone have a good trick for spotting those hairline cracks faster?
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max6316mo ago
That's actually a static port on the ADC, not a static line port. Those tiny cracks are a pain. I've had luck using a bright pen light at a sharp angle to cast a shadow in the defect. Sometimes a little soapy water bubble check is faster than a visual hunt.
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blaker755mo ago
Saw that and honestly I used to think it was just a line port too, but your explanation makes way more sense now. Gonna try the pen light trick next time I'm dealing with one of those.
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stella_ross146mo ago
Remember max631's pen light trick after a similar static port headache last month.
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