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View of the inside of the forward skirt.

Picture 6 of 6.

As this is the dynamic test stage, the forward thermoconditioning panels used to cool the electrical boxes installed in the forward skirt were not installed, but rather these identical-size dummy mass panels.

The small-diameter line at left would appear to be the hydrogen tank pressurization line. The larger-diameter line at left is the hydrogen tank vent line (which leads to the umbilical on the forward skirt).