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During the period between November 18 and November 21, 2017, seven airplanes with civilian
registry identified in Appendix 1 were serviced with jet fuel containing DEF at Eppley Air Field
Airport, Omaha, Nebraska (KOMA). During the same time period, an additional six airplanes
identified in Appendix 2 were serviced using refueling equipment that had been exposed to DEF.
The DEF was inadvertently used instead of fuel system icing inhibitor (FSII) on two refueling trucks
at KOMA and injected into the fuel with each truck’s FSII injection system. Only those airplanes
identified in Appendix 1 received the contaminated fuel, and only those airplanes identified in
Appendix 2 were serviced with refueling equipment that had been exposed to DEF.

DEF is a urea-based chemical that is not approved for use in jet fuel. When mixed with jet fuel,
DEF will react with certain jet fuel chemical components to form crystalline deposits in the fuel
system. These deposits will flow through the aircraft fuel system and may accumulate on filters,
fuel metering components, other fuel system components, or engine fuel nozzles. The deposits may
also settle in the fuel tanks or other areas of the aircraft fuel system where they may potentially
become dislodged over time and accumulate downstream in the fuel system as described above.
Airplanes identified in Appendix 1 have experienced clogged fuel filters and fuel nozzle deposits
that led to service difficulties and unplanned diversions. Airplanes identified in Appendix 2 were
exposed to trace amounts of DEF from residual fuel remaining in the refueling hoses and equipment
and we have not received any service difficulty reports from these aircraft.

Read more below by downloading the full PDF.

Close Call for Falcon with DEF-contaminated Fuel

FAA issues warning about contaminated fuel

Another mishap involving jet-A contaminated by diesel exhaust fluid (DEF) occurred on August 14 when a Fair Wind Air Charter-operated Dassault Falcon 900EX was forced to make an emergency return to Miami Opa-Locka Airport after suffering failure of two of its three engines. DEF, a urea-based solution that lowers nitrogen oxide pollutants in diesel exhaust, is not approved for use in jet fuel. When the two are accidentally mixed, crystals form, causing potentially catastrophic clogs throughout aircraft fuel systems.

According to Alexander Beringer, COO of Fair Wind, the problem manifested itself soon after takeoff, as the aircraft indicated a clog in its number-two engine fuel filter, followed quickly by the same indication in the number-three powerplant. The crew decided to return to base and then declared an emergency when the number-two engine failed. At 8,000 feet on approach, the number-three engine became unresponsive to throttle input, yet the crew landed safely on just the number-one engine, which also reported a filter clog. "We got lucky," he said, noting the entire incident occurred in less than 12 minutes from start to finish.

While the damage is still being tallied, Beringer noted that all three engines will have to be removed and undergo hot-section inspections; the APU will have to be removed, inspected and repaired; fuel pumps, filters, and control units will require replacement, and all the aircraft’s fuel tanks will have to be opened up and thoroughly cleaned. Estimates call for at least a month of downtime and more than $1 million in cost.

SEAL Aviation News