Premium on Safety - Issue 34, 2019 - 11

QUIZ ANSWERS
Questions on page 5

1. (B) It is always possible that the tank is empty, of course, but in
winter, the most likely explanation is that water made its way into
the tank (either by leakage and/or condensation) and settled to the
bottom and subsequently froze. Do not ignore this problem. Even if
ice is not blocking the fuel line, it is possible for it to thaw in flight and
make its way to the engine, causing a loss of power.

2. (A) Jet fuel density is more variable than avgas in reaction
to temperature.

4. (B) The most effective method to limit microbial growth in turbine
fuel is to eliminate water from the fuel.

5. (A) Jet fuel will damage or destroy a gasoline engine. To help
prevent misfueling, jet fuel hoses have a distinctive "duck bill" nozzle
that will not fit into a standard Avgas fuel port. Murphy's Law still
applies, however. Inexperienced rampers have mistaken "turbo"
cowling badges for "turbine" and used funnels to get around nozzle
compatibility issues, so it is always a good idea to supervise the
fueling of your aircraft.

3. Avgas 80 is red; Avgas 100 is green; Avgas 100LL is blue; Jet A, Jet
A-1, and Jet B are clear. It is a common misconception that mixing
avgas and jet fuel results in cancellation of the color of the avgas. It
doesn't. But avgas and jet fuel have different specific gravities and
evaporation rates, as well as "feel" and odor.

11



Premium on Safety - Issue 34, 2019

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Premium on Safety - Issue 34, 2019 - Contents
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