FAA Advisory Circular Addresses DEF, DPF and Training

FAA Advisory Circular 150/5230-4C contains specifications and guidance for aircraft fuel storage, handling, training and dispensing on airports. The September 2021 AC, which cancels a 2012 AC, lists new training requirements relating to diesel exhaust fluid (DEF), diesel particular filter (DPF) and fuel system icing inhibitor (FSII).

Diesel Exhaust Fluid (DEF)/Fuel System Icing Inhibitor (FSII)

An FAA spokesperson says the FAA added this training because of instances where DEF was accidentally mixed with fuel. When DEF is mixed with fuel, it causes the fuel filter to be clogged and results in engine failures.

“The FAA has been involved in numerous efforts with the industry to bring attention to this issue. Including this in the AC is one more important effort to make airports/operators aware of this important issue and associated training,” the spokesperson says. For more specific details can be found in a video produced by the Energy Institute (EI).

Diesel Particular Filter (DPF)

While the National Fire Protection Association (NFPA) Standard for Aircraft Fuel Servicing addressed DPF procedures, the spokesperson says the FAA believes it’s also important to include it in the AC. The vehicle must go through a regeneration process, which cleans the filter by burning off the buildup. The vehicle exhaust reaches extremely high temperatures during this process. The process must be done in a remote area, which is identified with specific signage. 

Lastly, the advisory circular (AC) includes an addendum of authorized fuel safety training courses. The FAA initially published fuel safety training as a certification alert then added it into the advisory circular in 2012.  According to the FAA, the purpose of the addendum is to ensure that the training is complete and effective, and that is determined by training providers and fueling agents submitting a syllabus to the FAA.

The addendum is a list of training providers that have submitted a training program that follows the guidance laid out in the AC and that the FAA has approved. The list changes when the FAA approves new providers or previously approved providers stop offering training.

“Ensure your personnel are properly trained in their daily duties,” the spokesperson says. “Properly wearing personal protective equipment (PPE) and practicing safe procedures will help reduce the possibility of mistakes. Quick reaction and knowing what to do in the event of an emergency will reduce property damage and potentially save lives.

“Training is not a one and done, it is continuous process. Things are always changing on the airport, be aware of your surroundings and act accordingly,” the spokesperson adds. “Fueling agents should continuously review the safety protocols and local fire codes to ensure personnel are staying up to date on the most current policies and procedures.”