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Partial walk-around of the fuel additive blender unit (FABU).

Picture 4 of 5.

On the FABU's aft face, the fitting at the top (as it is mounted on the FABU) is the additive fill port, used to load Oronite into the FABU. At right is the outlet port, where a line would carry the fuel-Oronite mixture to the gearbox to lubricate it.