Diesel Emission Fluid

Aqueous Urea Solution

DEF

AdBlue

Description

Diesel Exhaust Fluid (DEF), in some locations referred to as "Aqueous Urea Solution" and at others "AdBlue", is a clear, colourless, non-toxic, and virtually odourless, liquid that is injected into the post-combustion exhaust steam of a diesel engine to reduce emissions. If inadvertently mixed with jet fuel, it can cause clogging of fuel filters, fouling of fuel injectors, loss of engine power, RPM rollback and engine flameout. In the worst case scenario, these events could ultimately lead to the loss of the aircraft.