The tail unit's hydrogen peroxide overflow and vent port.
One hose from the hydrogen peroxide servicing truck would attach to the hydrogen peroxide fill and drain valve to fill
the 76-gallon hydrogen
peroxide tank on the engine. Another hose would attach to the hydrogen
peroxide overflow and vent port on the aft face of the tail
unit and connect to the H2O2 overflow tank
(a piece of ground support equipment, basically an enclosed bucket). Overflow
hydrogen peroxide was diluted and discarded, due to the possibility of
The hydrogen peroxide overflow and vent port is directly
adjacent to the steam vent.