Definition
A wide-cut turbine engine fuel made from a blend of gasoline and kerosene fractions, with a lower freezing point and higher volatility than Jet-A. It is used primarily in cold-climate operations where its low freezing point (around -50°C) is advantageous.
Plain English
A type of jet fuel that mixes gasoline-range and kerosene-range hydrocarbons. It stays liquid at very cold temperatures, which is why it is mainly used in places like northern Canada and Alaska.
Context Anchor
Seen in aircraft fuel specifications, fueling instructions, cold-weather operations, and discussions of turbine-engine fuels.
Derivation
The 'B' designation distinguishes it from Jet-A and Jet-A1, which are straight kerosene fuels. 'Wide-cut' refers to the broader range of hydrocarbon fractions blended into the fuel during refining.
Why Pilots Care
It prevents fuel from gelling or freezing during arctic or high-altitude flights where Jet-A would solidify.
Intuition Check
Jet-B does not mean “a better Jet A.” It is a different jet fuel blend, chosen mainly for cold-weather performance and handled with extra care because it ignites more easily.
Example Sentence 1
Operators flying in Alaska often use Jet-B because its low freezing point keeps the fuel flowing in extreme cold.
Example Sentence 2
Maintenance confirmed the aircraft was compatible with Jet-B Fuel before refueling for the cold-weather mission.