JPTS
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Jet Propellant Thermally Stable (JPTS) is a jet fuel originally developed in 1956 for the Lockheed U-2 reconnaissance aircraft.
Because of tight security restrictions enforced during the U-2's development, batches of fuel that were delivered to the aircraft's engine manufacturer were initially labeled LF-1.
In 1956, a year after the U-2's first flight, a USAF Captain assigned to the Fuels Branch was instructed to buy a tank car load of LF-1 and have it shipped to an engine manufacturer. Not knowing what LF-1 was, he obtained a sample, had it analyzed, and determined that it was paraffinic kerosene, a fluid commonly known as charcoal lighter fluid (hence LF-1).[1]
Specification MIL-T-25524 was later written to include an additive for improving JPTS' thermal oxidative stability.[2]
