Misfuelling means delivering the incorrect grade of fuel into an aircraft.

The risk of delivering the wrong grade of fuel exists for general aviation aircraft, and for some wider bodied aircraft that are overwing fuelled, and may therefore mistakenly be fuelled with avgas or jet fuel.

Serious consequences of misfuelling include engine failure if jet fuel is delivered instead of avgas or ignition/engine failure if avgas is delivered instead of jet fuel.

There are many similar looking aircraft in operation internationally, where visual appearance alone is not enough to identify the required fuel. In some cases, existing aircraft originally designed for aviation gasoline are being converted to jet fuel. In addition, the filling ports on modified aircraft may not have been replaced with the larger diameter fuelling ports dedicated for jet fuel hence increasing the risk of misfuelling.

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