Saturn V Instrument Unit Command Decoder, measuring 9″ x 4.25″ x 7.5″, with the front bearing a parts label from Space Craft, Inc., of Huntsville, Alabama, which reads: “Unit Name I.U. Command Decoder, SCI Part No. 1195000-3, Serial No. 004, Mfd for I.B.M. Federal Systems Division, Part No. 50Z12264-001, Contract No. 80456.” The front and back features a total of four ports, as well as outlets for “Fill” and “Vent.” The top plate bears a “Property NASA U.S. Government” label. In fine condition, with scattered scuffs and marks.
The Instrument Unit Command Decoder (IUCD) was a subsystem within the IU that interpreted and executed the commands sent to the Saturn V rocket during its mission. It received signals and instructions from ground control and other components of the rocket, such as the guidance and navigation systems. The IUCD would then process these commands and initiate the appropriate actions to control the rocket's engines, guidance system, and other critical systems.
In essence, the IUCD acted as a central nervous system for the Saturn V rocket, translating high-level commands into specific actions that kept the rocket on its intended course and allowed it to perform maneuvers such as stage separations, engine burns, and course corrections. Its role was essential for the success of the entire mission, ensuring that the complex series of events required for a successful launch, orbit insertion, and potential lunar missions were carried out accurately and safely.
From The Peter Gerry Collection.
