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Jim,
I tended to agree with you until another scenario was presented. For instance, tanker truck fills the airport tank with jet fuel - it was already half full, so there will be 50% jet fuel. Then the FBO has a routine to top off the fuel trucks first thing in the morning, whether they need it or not. If it was half full now there is 25% jet fuel. You pull up and only want to top off your half-full tanks - you've got maybe 12% jet. Maybe the fuel didn't mix perfectly at any point along the line, so you could easily end up with less than 10% jet-A. This might be the worst scenario as it is totally out of yours and the FBO's control. The tank truck driver came in the middle of the night and either had no clue or didn't want to admit the mistake. After all, he mistakenly put a few gallons of diesel in his car once and it didn't matter. Do FBO's pull samples from their trucks to make sure there is no contamination? I have no idea.
Gary
On May 22, 2008, at 3:00 AM, Lancair Mailing List wrote:
It seems unreasonable to me that anyone would ever have a Jet A contamination as low as 10%. In my Legacy that would mean that the line person would have put only 3.3 gallons of Jet A in a wing tank that already had 29.7 gallons of 100LL The Legacy wing holds 33 gallons per side. A more likely contamination would be adding 10 gallons of Jet A to a wing that had 23 gallons of 100LL in it. This would result in a mixture that is 30% (by volume) Jet A. Therefore, it would seem to me the contamination would be obvious, either by checking the smell, feel, color, or vaporization of a fuel sample.
Jim Thomas
Legacy
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