EASA and the FAA have announced they are cautioning operators over the potential effects of misapplying biocides to aircraft fuel, including multi-engine loss of thrust control, the administrations said.
The safety regulators recommend relevant parties should ensure they have adequate procedures in place for biocide treatment and, after Kathon FP 1.5 discontinuance, measures are taken to prevent biological risks, including non-use of contaminated fuel, the organizations said.
Biocides are used to counter the spread of waterborne micro-organisms which, if water accumulates in fuel tanks, feed off hydrocarbons in the fuel.
While the European Union Aviation Safety Agency says that good housekeeping to prevent water accumulation is the primary defence, it acknowledges that biocides are necessary if contamination is detected and states that personnel must follow correct procedures regarding method and dosage.
The FAA notes that Kathon FP 1.5 is one of the two most common biocides in operation, the other being Biobor JF. Concentrations of these additives in uplifted fuel should be respectively limited to 0.135ml and 0.269ml per litre.