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Instrument Unit (IU) Gallery


Detail of the environmental conditioning duct, the cable tray, and some wiring bundles.

Picture 3 of 3.

The environmental conditioning duct distributed the temperature and pressure regulated, ground supplied, filtered air or gaseous nitrogen (GN2) throughout the IU/S-IVB compartment through orifices in the duct. During the preflight phases of IU checkout, the purge system provided ventilating air. During fueling operations, it switched to GN2, thus preventing the accumulation of dangerous or corrosive gases which might have affected operation or safety. Purging of the IU/S-IVB compartment terminated with umbilical separation.

The air entered the duct at the IU umbilical. The interior of the umbilical connection featured a Y splitter to route the incoming air in both directions from the umbilical panel.

Instrument Unit (IU) environmental conditioning duct at U.S. Space and Rocket Center
Time picture taken Wed Jul 11 12:52:12 2007
Location picture taken Space Hall
"Old" Museum
U.S. Space & Rocket Center
Huntsville, AL
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