Nozzles and Ports - Gravity Fueling Interface Standard for Civil Aircraft
This SAE Aerospace Standard (AS) defines the maximum allowable free opening dimensions for airframe fueling ports on civil aircraft that require the exclusive use of gasoline as an engine fuel, and the minimum free opening dimensions for airframe fueling ports on civil aircraft that operate with turbine fuels as the primary fuel type and with gasoline as the emergency fuel type. This SAE Aerospace Standard (AS) also defines the features and dimensions for airframe refueling ports on civil aircraft that require the exclusive use of turbine fuel as an engine fuel.
In addition, this document defines the minimum fuel nozzle spout dimensions for turbine fuel ground service equipment, and the maximum fuel nozzle spout diameter for gasoline ground service equipment.
A new turbine fuel service port is required on SAE Aerospace Standard AS1852 to prevent misfueling of civil aircraft powered by new diesel engines, and turbine aircraft that require the exclusive use of turbine fuels for safe operation.