FAA has issued airworthiness directive 2020-18-09 for all Honeywell ALF502L, L-2, L-2A, L-2C, L-3, R-3, R-3A, R-4, R-5, R-6, LF507-1F and -1H engines, requiring initial and repetitive visual inspections of the over-speed fuel solenoid valve assembly and the fuel filter outlet and, depending on results, possible inspection of the adjacent fuel system tube assemblies as well as replacement or overhaul of the over-speed fuel solenoid valve assembly, plus periodic overhaul of the over-speed fuel solenoid valve assembly, effective Oct. 21, 2020.