What was found
DURING AIRCRAFT REFUELING WHEN THE NOZZLE IS INSERTED INTO THE FUEL FILLER, IT OPENS THE ANTI-SYPHON VALVE FLAPPER DOOR (SPRING LOADED) AND EXTENDS INTO THE TANK AREA. THE AREA OF ANTI-SYPHON VALVE THAT THE FLAPPER DOOR SEALS AGAINST IS CALLED THE PAN. THIS PART OF THE ANTI-SYPHON VALVE GETS DAMAGED (BENT) FROM THE NOZZLE. AFTER THE PAN IS DAMAGED, THE FLAPPER DOOR CANNOT SEAL AND THE ANTI-SYPHON VALVE BECOMES LESS EFFECTIVE. SUBMITTER RECOMMENDS CARE BE TAKEN WHEN INSERTING THE NOZZLE INTO THE TANK AND FUELING.