Avgas Question

Aviation fuels are manufactured so that if any two of them are combined (100+100LL; Jet-a with any avgas, ect.) they will become colorless.
 
Well, it's a possible test question for Aircraft Systems class...

I though I heard the professor say "Colorless" but I wasn't sure if I heard right. Green + Blue = Turquoise (correct?), but not in this case :D
 
avdrummerboy said:
Aviation fuels are manufactured so that if any two of them are combined (100+100LL; Jet-a with any avgas, ect.) they will become colorless.
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I talked to a guy once whose engine was being rebuilt. It was destroyed after he flew it with a mix of 100LL and Jet-A -- the line guys made a mistake when they fueled it. He said that he did test the fuel before flying, but it was blue like any 100LL. He also said that there are fuel samplers available that have a float ball in them, and those can detect Jet-A mixed in avgas.

-C.
 
clumpinglitter said:
I talked to a guy once whose engine was being rebuilt. It was destroyed after he flew it with a mix of 100LL and Jet-A -- the line guys made a mistake when they fueled it. He said that he did test the fuel before flying, but it was blue like any 100LL. He also said that there are fuel samplers available that have a float ball in them, and those can detect Jet-A mixed in avgas.

-C.
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Jet fuel is heavier than 100 LL and if he did actually sump it, Jet A should have come out first.
 
clumpinglitter said:
I talked to a guy once whose engine was being rebuilt. It was destroyed after he flew it with a mix of 100LL and Jet-A -- the line guys made a mistake when they fueled it. He said that he did test the fuel before flying, but it was blue like any 100LL. He also said that there are fuel samplers available that have a float ball in them, and those can detect Jet-A mixed in avgas.

-C.
Click to expand...

It would probably take a few minutes for the Jet-A to settle to the bottom. If he sumped it immediately after it was fueled, it may still be blue.

I had the misfortune of having a PA31 I was flying misfueled on my very last day flying it. I ordered "12 gallons of 100LL in the outboards", and instead got one of the inboards (which were almost full) topped with Jet-A. :confused: Luckily I caught him in the act before he could top the other inboard. It took 8 hours to find an authorized mechanic, enough containers to hold 55ish gallons, and the tank to be drained/flushed/refueled. That sucked.
 
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