BigZ
Well-Known Member
Out of an airplane? For the most part, you don't, which is why it's critical to deliver clean fuel. Large aircraft do have sump drains, they're mostly inaccessible or a maintenance function.
Jet pits have a higher turnover simply because they sell more volume, so they tend to be less susceptible to humidity and temperature fluctuations that would cause significant condensation, where low lead pits tend to sell slower and have more day/night temp swings to condensate water. They're still sumped every day, and each truck is sumped and sampled when deliveries arrived, but you'll always get a little water out of a tank that sits outside if it's any kind of humid.
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Thank you, I did read up a bit after posting that. Everything jet I have touched so far, sumping plane tank drains was a maintenance function (I did drain the 'Van before my buddy's shower as described in "not do that again" thread, but it became maintenance guys' job after that), hence I wasn't sufficiently educated on what you can actually find sumping the FBO tanks/trucks.
Interestingly enough, in the 7 years in FL the only time I ever found water in 100LL was when a wrong size o-ring was installed on a fuel cap.
IL - half the times airplane spent the night with tanks not topped off