Diesel Exhaust Fluid Can Cause Harm to Aircraft

August 22, 2019 - Last year, multiple jet aircraft were serviced with fuel containing diesel exhaust fluid (DEF) instead of fuel system icing inhibitor (FSII), which can cause crystalline deposits that are capable of shutting down engines.

DEF, which is a chemical used to treat exhaust that comes from fueling trucks to reduce emissions, is similar in appearance to FSII, which is meant to be used in jet aircraft. The FAA recommended that the two fuels no longer be stored near each other, and that containers of both should be clearly marked with their contents to ensure no confusion.

DEF-contaminated jet fuel should be discarded immediately, as it can have a catastrophic effect on jet engines in flight.